Quote:
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Originally Posted by quattro527
Problem was fixed.
Cause: Fuel Pressure Regulator  Pulled the vacuum hose off the FPR during idle, and massive amount of fuel squirted out of the valve, indicating a torn diaphram which is keeping the fuel pressure from being lower during idle (which explains why the car idled badly and fouled plugs, but ran normally at WOT). Cost me $70 at AutoZone, and took 30min to replace.
Future Note: Check the FPR by pulling the vacuum, to check for any fuel leaks. Fuel should NOT make it's way out to the vacuum, nor should you smell any unburned fuel from the line. Any signs of fuel in the vacuum is an indication of a FPR going bad, which will throw all the "Missfire codes", which is NOT caused by bad coils, wires, or plugs, but by the combustion chamber flooding itself.  |
good diagnossis
but don't say that the coils can't cause a miss fire code
a combination or problems can cause one code
or one problem u don't even think could cause the problem
the computer isn't smart
it only knows if some thing is wrong
so if its miss firing it will only know its missing
and not exactly way it is
i didn't have any codes telling me my injectors were bad
i didn't even have a miss fire code
but eventually i got a o2 sensor code
after running it with the super rich mix
one or more of my injectors was stuck open
i din't have any fuel in vac line to regulator
and ohm test found a few bad injectors