Quote:
Originally Posted by boyt911sc
Install a pressure gauge at the test port located at the fuel rail near intake #1. I used my CIS gauge with the shut-off valve @ closed position. Then test run the FP by bridging fuses #16 & #17. The spec. 33~39 psi. (No Vac. applied or Engine off). If vacuum is applied either by a vac hand pump or a running motor, the spec. is 29 psi.
Switch off the FP and monitor the residual pressure for the next 15 mins. A good residual pressure should be about 14.5 psi./1 bar or more but not less.
Tony
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Tony,
Based on my initial findings, is the FPR a sensible direction to be looking?
How exactly does a 911 line this behave with a faulty FPR? Only problems on warm start? Or cold start too? I can’t detect a pattern with mine. Seems like the difficult starts happen arbitrarily. Wonder if my living in South Florida heat is making this an extra tricky diagnosis.
If I perform that pressure test, do I need to remove only the air intake (as if i’m changing the air filter) or more?
Finally, do you have a picture of that test port? Will a tire pressure gauge with flexible hose work with some type of adapter?