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Originally Posted by RUSSH
My only concern now is, since the car only acts up after running for a little bit, won't the fuel pressure be inaccurate since I'm checking it cold?
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The fuel pressure will be fairly constant whether the engine is cold or hot. It changes depending on engine vacuum conditions. Initial readings are taken with engine to off, ignition to run (fuel pump prime) and then checked with engine running. The fuel pressure regulator (FPR) is vacuum operated. So the vacuum line to the FPR is removed and reconnected to see if there is a pressure difference. A difference around 4 - 6 psi would indicate a possible flaky FPR. Checking fuel pressure is just one step in the troubleshooting process. Until checked it is hard to rule it out. If fuel checks out then other areas would have to be looked at such as ignition. Components that are heat sensitive and can cause intermittent problems would be the two crank position sensors (24X and 3X), the camshaft position sensor and the ICM.