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2008 SRX-V8, 1991 Eldorado
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1,542 Posts
Loss of power and higher fuel consumption and sometimes combined with higher oil consumption may well be traced back to carbon build up.

WOT's only disloge a small amount of carbon and has little effect on an engine with heavy carbon deposit residule. Heavy is to imply when the second and or third rings have become immobile and the EGR sets a code not long after a cleaning.

Not all performance problems are a direct result of heavy carbon deposits, but they are common, and more pronounced in higher mileage engines.
 

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Registered
2008 SRX-V8, 1991 Eldorado
Joined
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1,542 Posts
I must agree that the FPR is a simple check, but a leaking FPR will normally manifest itself as a warm engine hard start problem first, long before a performance problem is noted.

Yes, a leaking FPR will indeed cause a rich condition affecting performance and higher than normal fuel consumption, but I stand by my original post regarding carbon deposits.

Codes will very much help with the diagnostic process.
 
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