Mazda · Known Issues

2006-2007 Mazda Mazdaspeed6 Problems: 13 Issues Every Owner Should Know

2006-2007 model years · 370+ owner reports · Updated June 2026

According to Au7o's analysis of 370+ owner reports, the 2006-2007 Mazda Mazdaspeed6 has 13 documented known issues, with 7 rated critical. The most serious are AWD Transfer Case Seal Failure and Internal Destruction ($300-$3,500 repair), Connecting Rod Failure Under Boost at Low RPM ($3,000-$7,000 repair), VVT Actuator / Timing Chain Noise on Cold Start ($500-$1,200 repair), Takata Airbag Inflator Recalls (Driver and Passenger), Turbocharger Oil Starvation and Failure ($600-$2,000 repair), Weak Rear Differential Mount / Sheared Mount Bolts ($150-$800 repair) and Fuel Pump Mounting Ring Leak Recall. The most commonly reported issue is AWD Transfer Case Seal Failure and Internal Destruction with 150 owner reports. Across all issues, repair costs range from $50 to $7,000. DIY maintenance guides at au7o.io.

All 13 Known Issues

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When Issues Typically Appear

Rear Differential and Transfer Case Fluid Neglect Damage

24K-36K

Turbocharger Oil Feed Line Leak and Turbo Failure

40K-60K

Connecting Rod Failure Under Boost at Low RPM

48K-72K

Turbocharger Oil Starvation and Failure

50K-100K

025K50K75K100K mi

Community Reported

120 owners

On the 2006-2007 Mazda Mazdaspeed6, the Mazdaspeed6 shares the 2.3L DISI turbo engine with the Mazdaspeed3 but was Mazda's first iteration of this powerplant, resulting in more frequent connecting rod failures. Bone-stock examples throwing a rod is not uncommon. The failure typically occurs when the driver requests full throttle at low RPM (2000 RPM in 5th/6th gear), subjecting the connecting rods to excessive loading. Turbo failures can also send debris into the cylinders, compounding the problem. Injector seal leaks and PCV system failures contribute to overall engine fragility.

This issue also affects: Mazda CX-7, Mazda Mazdaspeed3

Common Symptoms

Sudden loud knocking noise from engine under acceleration
Complete loss of engine power
Large quantity of oil leaking from beneath engine
Metal debris visible in oil during oil change
Increasing rod knock noise at idle that worsens with RPM

How to Fix

Avoid full-throttle acceleration below 3000 RPM — always downshift to keep the engine above 3000 RPM before requesting boost. Install an oil catch can to manage PCV blow-by and keep the intake clean. Replace injector seals proactively at 60,000 miles. If building the engine, upgrade to forged connecting rods and ARP head studs. Monitor oil pressure closely and shut down immediately if pressure drops below 20 PSI at idle.

What Owners Are Using

Parts and tips from 120+ owners who fixed this issue

NoteIf you are buying a used Mazdaspeed6, always do a compression and leak-down test before purchase. These engines can have hidden damage from previous owners who lugged the turbo at low RPM.
TipInstall an oil catch can on the PCV system — this is cheap insurance that keeps carbon buildup off the intake valves and reduces the chance of oil vapor entering the combustion chambers.
UpgradeBluetooth OBD-II scanner for reading engine codes and monitoring live data (BlueDriver Bluetooth OBD2 Diagnostic Scan Tool)
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UpgradeQuality synthetic oil and filter combo for engine maintenance (Mobil 1 Full Synthetic Oil and Filter Bundle)
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Typical repair cost:$3,000 - $7,000

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Community Reported

High Confidence120 reportsLast reported by owners Mar 2026Reviewed Mar 2026

On the 2006-2007 Mazda Mazdaspeed6, on cold start the L3T 2.3L DISI engine often emits a loud ticking, rattling or 'diesel-like' knocking noise from the variable valve timing (VVT) actuator. The actuator has a lock pin that sets cold-start timing; the pin is harder than the surrounding aluminum and wears an elongated hole, so it no longer locks and rattles until oil pressure builds. The original timing chains were also poor quality and stretch more than they should, and a stretched chain plus worn tensioner compounds the noise. Both rely on oil pressure, which is why the noise appears cold and quickly fades.

Common Symptoms

Loud ticking, rattling or knocking on cold start
Diesel-like clatter that fades after a few seconds once oil pressure builds
Noise worse after sitting overnight

How to Fix

Replace the VVT actuator (heat-treated revised part) and, as a precaution, the timing chain and tensioner since one failure often follows the other. Mazda issued an extended warranty to 84 months / 70,000 miles specifically covering the VVT and timing chain noise repair on 2006-2007 Mazdaspeed6 L3T engines. Quick check: with the engine cold, remove the oil cap, lift the timing chain with a finger, and if it moves much it needs repair.

Typical repair cost:$500 - $1,200

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Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2006-2007 Mazda Mazdaspeed6 2.3L MZR DISI Turbo I4, the Mazdaspeed6 shares the 2.3L DISI turbo engine with the Mazdaspeed3 and CX-7, inheriting the same turbo oil starvation issue. The turbo oil feed line's banjo bolt contains a small mesh screen that clogs with carbon deposits, restricting oil flow to the turbo bearing. The K04 turbocharger fails between 50,000-100,000 miles if the screen is not maintained. The AWD system adds additional drivetrain stress.

This issue also affects: Audi A3, Audi A6, Audi A8

Common Symptoms

Whining or screeching from turbo
Blue/white smoke from exhaust
Loss of boost pressure
Oil consumption increases
Excessive shaft play in turbo

How to Fix

Remove and clean (or delete) the turbo oil feed banjo bolt screen every 15,000-20,000 miles. Use full synthetic oil changed every 3,000-5,000 miles. Allow the engine to idle for 60 seconds before shutdown after spirited driving. If the turbo has failed, a replacement K04 costs $600-$1,000 or upgrade to a K04-882 or BNR S3 for improved flow. Always replace the oil feed line with a new unit during turbo replacement.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

NoteClean the banjo bolt screen YESTERDAY. This is the #1 killer of the 2.3 DISI turbo. A $0 screen cleaning every other oil change prevents a $1,500 turbo replacement. Full synthetic only, 5k max intervals.
UpgradeTurbo gasket kit prevents boost leaks and oil seepage at the turbo flanges (Dorman Turbocharger Gasket Kit)
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UpgradeBoost gauge helps monitor turbo performance and catch problems early (AutoMeter Mechanical Boost Gauge)
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Typical repair cost:$600 - $2,000

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Community Reported

Medium Confidence0 reportsLast reported by owners Invalid DateReviewed Invalid Date

Community Reported

100 owners

On the 2006-2007 Mazda Mazdaspeed6 2.3L DISI Turbo, the Mazdaspeed6 shares the K04 turbocharger and its associated problems with the Mazdaspeed3. The turbo oil feed line uses an O-ring gasket behind a crimp connection that sits directly against the turbo's hot side. The O-ring degrades from heat exposure, causing oil to leak onto the exhaust manifold — a fire hazard. Turbo failures are accelerated by the oil starvation that follows, and the PCV system contributes additional oil contamination to the turbo bearings. Mazda extended warranty coverage for smoking turbos under a Special Service Program.

This issue also affects: Audi A3, Audi A6, Audi A8

Common Symptoms

Oil seepage or drips near turbocharger area
Blue or white smoke from exhaust at idle
Burning oil smell from engine bay after driving
Decreasing turbo boost pressure over time
Oil consumption increasing beyond 1 quart per 1000 miles

How to Fix

Replace the turbo oil feed line O-ring proactively at 50,000 miles or at the first sign of oil seepage. Inspect the turbo return line for restrictions that can cause oil to back up into the turbo. If the turbo is smoking at idle, it may be salvageable with new seals if caught early. Always idle the engine for 60-90 seconds before shutdown to prevent oil coking in the turbo bearings. Check with your dealer about the Special Service Program warranty extension for turbo smoking.

What Owners Are Using

Parts and tips from 100+ owners who fixed this issue

TipThe turbo oil feed line O-ring replacement is a $20 part and 2-hour job — do it proactively at 50K miles. Waiting until it fails can cause a $2000+ turbo replacement and potential engine fire.
UpgradeHigh-quality synthetic oil helps reduce consumption and protect worn engines (Mobil 1 Extended Performance Full Synthetic Motor Oil)
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UpgradePremium oil filter ensures proper filtration with high-mileage engines (Wix Oil Filter)
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Typical repair cost:$150 - $2,000

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High Confidence100 reportsLast reported by owners Mar 2026Reviewed Mar 2026

On the 2006-2007 Mazda Mazdaspeed6, on the L3T DISI engine the PCV draws crankcase pressure from the engine block rather than the valve cover, and the valve and rubber hoses clog with crankcase contaminants. When they clog, crankcase pressure builds and blocks the turbocharger oil-return line, so pressurized oil has nowhere to go but past the turbo shaft seal into the intake tract, where it gets burned. The result is sudden high oil consumption and the well-known 'smoking gen-1 turbo' often blamed on bad turbo seals. The smoke is usually the symptom, not a failed turbo.

Common Symptoms

Blue/white smoke from exhaust, especially at idle or after sitting
Rapidly dropping oil level between changes
Oil residue in intake/intercooler piping

How to Fix

Replace the PCV valve and clogged plumbing; many owners install an updated/aftermarket PCV setup and an oil catch can to keep crankcase oil out of the intake. Confirm with weekly oil-level checks and watch for blue smoke at idle. Replacing the turbo without fixing the PCV will just smoke again.

Typical repair cost:$50 - $400

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High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2006-2007 Mazda Mazdaspeed6, like all direct-injected engines, the Mazdaspeed6's MZR DISI engine sprays fuel directly into the cylinder, so no fuel washes over the back of the intake valves. Combined with oil vapor from the PCV and EGR, carbon accumulates heavily on the intake valves over time, eventually choking airflow and hurting performance, idle quality and throttle response. Chemical cleaners like Seafoam do not meaningfully remove this baked-on deposit.

Common Symptoms

Rough idle and reduced throttle response over time
Gradual power loss / hesitation
Misfire feel at higher mileage

How to Fix

Manual cleaning is the only effective fix: remove the intake manifold and walnut-blast or hand-scrub the valves, commonly recommended around every 40,000 miles. Reduce future buildup by fitting an oil catch can, replacing/cleaning the PCV, and reducing EGR contribution.

Typical repair cost:$200 - $600

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High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

Community Reported

150 owners

On the 2006-2007 Mazda Mazdaspeed6 2.3L DISI Turbo, the Mazdaspeed6's Volvo-sourced AWD transfer case suffers from chronic seal leaks that allow fluid to slowly seep out. If the seeping goes unnoticed, the transfer case runs dry and destroys itself internally, requiring a complete replacement. Mazda issued a recall for the transfer case on early production models. The transfer case rebuild is prohibitively expensive, and used replacements are scarce due to the limited 2-year production run of the Mazdaspeed6.

This issue also affects: Mazda CX-7, Mazda Mazdaspeed3

Common Symptoms

Fluid spots on ground beneath center of vehicle
Grinding or whining noise from center of vehicle during acceleration
AWD system warning light on dashboard
Vibration through floor during acceleration, especially in turns
Complete loss of rear-wheel drive (front-wheel-drive only operation)

How to Fix

Inspect the transfer case for fluid leaks at every oil change by checking the ground beneath the center of the vehicle and the transfer case housing itself. If any seepage is found, have the seals replaced immediately before the unit runs dry ($300-500 for seal replacement). If the transfer case has already been damaged from running dry, a used or rebuilt unit costs $1500-3000 plus $500-800 for labor. Consider installing a magnetic drain plug to catch metal debris early.

What Owners Are Using

Parts and tips from 150+ owners who fixed this issue

NoteCheck the transfer case fluid level and look for leaks EVERY oil change — once it runs dry, the damage is done within 500-1000 miles and the entire unit needs replacement. This is the single most critical maintenance item on the Mazdaspeed6.
TipJoin the Mazdaspeeds.org forum and post in the 'WTB' section if you need a replacement transfer case — used units from salvage yards sell out quickly due to the car's rarity.
UpgradeMobil 1 75W-90 synthetic gear oil for differential and transfer case (Mobil 1 Synthetic Gear Oil 75W-90)
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UpgradeFel-Pro gasket kit for drivetrain service (Fel-Pro Gasket Kit)
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Typical repair cost:$300 - $3,500

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High Confidence150 reportsLast reported by owners Mar 2026Reviewed Mar 2026

On the 2006-2007 Mazda Mazdaspeed6, the all-wheel-drive Mazdaspeed6's rear differential front mount attaches with only two bolts into the diff housing and uses very soft bushings. Under hard launches and wheelhop the bolts back out over time and then shear when driveshaft torque loads the diff, which can also break the rear axles. Mazda effectively acknowledged the weakness by increasing the mount from two bolts to four on the closely related CX-7. Owners report this happening even on completely stock cars, sometimes repeatedly.

Common Symptoms

Clunking or banging from the rear under acceleration/deceleration
Driveline play and wheelhop
Sheared or missing rear diff bolts
Broken rear axle in severe cases

How to Fix

Periodically check and re-torque the rear diff mount bolts. The lasting fix is an aftermarket rear differential brace/mount (CorkSport, Turbine Tech, etc.) that adds bracing and stiffer bushings to stop the bolts from backing out and shearing. Damaged axles must be replaced if the failure cascaded.

Typical repair cost:$150 - $800

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High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2006-2007 Mazda Mazdaspeed6 2.3L MZR DISI Turbo I4, the Mazdaspeed6's AWD system uses an electronically controlled active transfer case and rear differential that require specific fluid changes often neglected by owners and shops. The transfer case fluid degrades and causes the coupling to slip or judder during cornering. The rear differential uses limited-slip fluid that must be changed with the correct additive, or the LSD chatters and wears prematurely.

This issue also affects: Mazda Mazdaspeed3, Mazda CX-9

Common Symptoms

Judder or binding during tight turns
Chatter from rear differential in corners
Whining noise from rear of vehicle
AWD system warning light
Difficulty turning in parking lots

How to Fix

Change the transfer case fluid every 30,000 miles with Mazda-specified fluid (FE-LS ATF or equivalent). Change the rear differential fluid every 30,000 miles with 75W-90 GL-5 gear oil plus an LSD friction modifier additive. The transfer case holds about 0.6L and the rear diff about 0.8L — small volumes that are cheap to maintain. Neglecting these fluids leads to $2,000+ drivetrain repairs.

What Owners Are Using

Parts and tips from 0+ owners who fixed this issue

TipThe transfer case and rear diff fluid changes are $40 each in fluid and take 20 minutes. Do them every 30k miles. I've seen Speed6 owners spend $2,500 on a transfer case because they never changed $40 worth of fluid.
UpgradeRoyal Purple Max-Gear differential fluid for superior protection (Royal Purple Max-Gear Differential Fluid)
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UpgradeDorman differential cover gasket — direct OE replacement (Dorman Differential Cover Gasket)
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Typical repair cost:$80 - $2,000

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On the 2006-2007 Mazda Mazdaspeed6, under NHTSA recall 21V744 (2021), certain 2006-2007 Mazdaspeed6 vehicles were recalled because fuel can leak from the fuel pump mounting rings. A fuel leak near electrical/heat sources increases the risk of fire. This is a later-life corrosion/sealing issue on the in-tank fuel pump assembly mounting flange.

Common Symptoms

Fuel smell around or under the vehicle
Visible fuel seepage near the tank/pump flange

How to Fix

Mazda dealers inspect and repair/replace the affected fuel pump mounting ring/sealing components free of charge under the recall. Owners should verify the VIN against NHTSA to confirm the recall is open and have it remedied.

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High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2006-2007 Mazda Mazdaspeed6, the mechanical HPFP is driven off an intake cam lobe and is famous for not maintaining the stock ~1600 psi rail pressure at high load, with pressure dropping under acceleration. Internal wear of the piston, sleeve and cam bucket, or a sticking spill valve / stuck pressure-relief valve, causes intermittent pressure fluctuations. The lean condition from dropping fuel pressure produces bogging and hesitation and, on tuned cars, can be dangerous to the engine.

Common Symptoms

Bogging or hesitation under hard acceleration
Fuel pressure dropping below spec under load
Stumble/misfire feel at high RPM or high boost

How to Fix

Diagnose by logging fuel pressure under load with an Accessport or fuel-pressure gauge to confirm the pump can't hold spec. Worn internals are rebuilt with upgraded internal kits; stuck spill/relief valves or a bad housing check valve are replaced. Keeping the engine in good tune and not over-demanding fuel from the stock pump extends its life.

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On the 2006-2007 Mazda Mazdaspeed6, the 2006-2007 Mazdaspeed6 is covered by multiple NHTSA Takata airbag recalls. Both the driver dual-stage frontal airbag and the front passenger airbag use inflators that, after long-term exposure to high humidity and temperature cycling, can have their propellant degrade and rupture during deployment, spraying metal fragments at occupants. Several campaigns were issued over the years, including replacements of inflators that had themselves been installed under an earlier recall.

Common Symptoms

No drivable symptom; risk only manifests during a crash when the inflator can rupture
Airbag warning light may illuminate in some cases

How to Fix

Have the airbag inflators replaced free of charge at a Mazda dealer under the applicable recall campaigns (e.g., NHTSA 14V773, 15V869, 16V354, 17V474, 18V402, 19V781). Check the VIN against NHTSA's recall database to confirm which campaigns remain open.

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On the 2006-2007 Mazda Mazdaspeed6, the 6-speed manual is frequently described as notchy and hard to shift, sometimes nearly impossible to get into gear, and the clutch is criticized for an on/off engagement feel. Early 2006 cars came with a stiffer clutch assembly that drew many complaints and warranty replacements; later-2006 builds got an updated clutch, but all are prone to changing looseness/stiffness. Factory clutch pedal height is often not set correctly, worsening feel, and the clutch pedal assembly itself is a known weak point prone to breaking.

Common Symptoms

Hard, notchy shifting; gears hard to engage
On/off grabby clutch take-up
Clutch pedal sinks to floor with no resistance or fails to return
Premature clutch wear

How to Fix

Mazda issued a TSB for the clutch issues; dealers adjusted pedal height and replaced clutch assemblies under complaint. Correctly setting pedal/pushrod height resolves many shift complaints; a failed clutch hydraulic (slave/master cylinder) or broken pedal assembly is replaced as needed. Owners who track or abuse the clutch see premature wear.

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Frequently Asked Questions

What are the most common Mazda Mazdaspeed6 problems?

According to Au7o's analysis of 370+ owner reports, the 2006-2007 Mazda Mazdaspeed6 has 13 documented issues. The most frequently reported are: AWD Transfer Case Seal Failure and Internal Destruction, Connecting Rod Failure Under Boost at Low RPM, VVT Actuator / Timing Chain Noise on Cold Start. Of these, 7 are rated critical and should be addressed promptly.

Is the Mazda Mazdaspeed6 reliable?

The 2006-2007 Mazda Mazdaspeed6 has 13 known issues documented across 370+ owner reports. 7 issues are rated critical: AWD Transfer Case Seal Failure and Internal Destruction and Connecting Rod Failure Under Boost at Low RPM and VVT Actuator / Timing Chain Noise on Cold Start and Takata Airbag Inflator Recalls (Driver and Passenger) and Turbocharger Oil Starvation and Failure and Weak Rear Differential Mount / Sheared Mount Bolts and Fuel Pump Mounting Ring Leak Recall. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Mazda Mazdaspeed6 problems?

Repair costs for known Mazda Mazdaspeed6 issues range from $50 to $7,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, AWD Transfer Case Seal Failure and Internal Destruction, typically costs $300-$3,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2006-2007 Mazda Mazdaspeed6 AWD Transfer Case Seal Failure and Internal Destruction?

The Mazdaspeed6's Volvo-sourced AWD transfer case suffers from chronic seal leaks that allow fluid to slowly seep out. If the seeping goes unnoticed, the transfer case runs dry and destroys itself internally, requiring a complete replacement. Mazda issued a recall for the transfe… Repairs typically run $300-$3,500. Severity: high.

What is the 2006-2007 Mazda Mazdaspeed6 Connecting Rod Failure Under Boost at Low RPM?

The Mazdaspeed6 shares the 2.3L DISI turbo engine with the Mazdaspeed3 but was Mazda's first iteration of this powerplant, resulting in more frequent connecting rod failures. Bone-stock examples throwing a rod is not uncommon. The failure typically occurs when the driver requests… Repairs typically run $3,000-$7,000. Severity: high.

All 13 Known Issues

When Issues Typically Appear

2006-2007 Mazda Mazdaspeed6: Connecting Rod Failure Under Boost at Low RPM#

Common Symptoms

How to Fix

What Owners Are Using

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2006-2007 Mazda Mazdaspeed6: VVT Actuator / Timing Chain Noise on Cold Start#

Common Symptoms

How to Fix

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2006-2007 Mazda Mazdaspeed6: Turbocharger Oil Starvation and Failure#

Common Symptoms

How to Fix

What Owners Are Using

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2006-2007 Mazda Mazdaspeed6: Turbocharger Oil Feed Line Leak and Turbo Failure#

Common Symptoms

How to Fix

What Owners Are Using

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2006-2007 Mazda Mazdaspeed6: PCV System Failure Causing Oil Consumption and Smoking Turbo#

Common Symptoms

How to Fix

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2006-2007 Mazda Mazdaspeed6: Intake Valve Carbon Buildup (Direct Injection)#

Common Symptoms

How to Fix

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2006-2007 Mazda Mazdaspeed6: AWD Transfer Case Seal Failure and Internal Destruction#

Common Symptoms

How to Fix

What Owners Are Using

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2006-2007 Mazda Mazdaspeed6: Weak Rear Differential Mount / Sheared Mount Bolts#

Common Symptoms

How to Fix

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2006-2007 Mazda Mazdaspeed6: Rear Differential and Transfer Case Fluid Neglect Damage#

Common Symptoms

How to Fix

What Owners Are Using

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2006-2007 Mazda Mazdaspeed6: Fuel Pump Mounting Ring Leak Recall#

Common Symptoms

How to Fix

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2006-2007 Mazda Mazdaspeed6: High-Pressure Fuel Pump (HPFP) Cannot Hold Pressure Under Load#

Common Symptoms

How to Fix

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2006-2007 Mazda Mazdaspeed6: Takata Airbag Inflator Recalls (Driver and Passenger)#

Common Symptoms

How to Fix

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2006-2007 Mazda Mazdaspeed6: Notchy Manual Transmission and Clutch Engagement Problems#

Common Symptoms

How to Fix

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Other Mazda Models

Frequently Asked Questions

What are the most common Mazda Mazdaspeed6 problems?

Is the Mazda Mazdaspeed6 reliable?

How much does it cost to fix common Mazda Mazdaspeed6 problems?

What is the 2006-2007 Mazda Mazdaspeed6 AWD Transfer Case Seal Failure and Internal Destruction?

What is the 2006-2007 Mazda Mazdaspeed6 Connecting Rod Failure Under Boost at Low RPM?

What is the 2006-2007 Mazda Mazdaspeed6 VVT Actuator / Timing Chain Noise on Cold Start?

What is the 2006-2007 Mazda Mazdaspeed6 Takata Airbag Inflator Recalls (Driver and Passenger)?

What is the 2006-2007 Mazda Mazdaspeed6 Turbocharger Oil Starvation and Failure?

What is the 2006-2007 Mazda Mazdaspeed6 Weak Rear Differential Mount / Sheared Mount Bolts?

What is the 2006-2007 Mazda Mazdaspeed6 Fuel Pump Mounting Ring Leak Recall?

What is the 2006-2007 Mazda Mazdaspeed6 Turbocharger Oil Feed Line Leak and Turbo Failure?

What is the 2006-2007 Mazda Mazdaspeed6 Notchy Manual Transmission and Clutch Engagement Problems?

What is the 2006-2007 Mazda Mazdaspeed6 PCV System Failure Causing Oil Consumption and Smoking Turbo?

What is the 2006-2007 Mazda Mazdaspeed6 Rear Differential and Transfer Case Fluid Neglect Damage?

What is the 2006-2007 Mazda Mazdaspeed6 High-Pressure Fuel Pump (HPFP) Cannot Hold Pressure Under Load?

What is the 2006-2007 Mazda Mazdaspeed6 Intake Valve Carbon Buildup (Direct Injection)?