Hi Jamie,
Thank you for the donation.
The standard fuel pressure should be 26 psi (179kPa) and you mentioned 71 psi which is very high and can mean a faulty fuel pressure regulator.
Following are possible causes and recommended chack list.
• Check for improper operation of A/C system.
• Check for erratic signal or no signal from CMP sensor.
• Check for air leakage from intake-air system parts.
• Check for purge solenoid valve malfunction.
• Check for improper operation of electronic throttle control system.
• Check for EGR valve malfunction.
• Check for erratic signal from CKP sensor.
• Check for low engine compression.
• Check for vacuum leakage.
• Check for poor fuel quality.
• Check for main relay intermittent malfunction.
• Check for throttle body malfunction.
• Check for engine overheating.
• Check for spark plug malfunction.
• Check for improper air/fuel mixture control operation.
• Check for erratic signal to ignition coil.
• Check for air cleaner restriction.
• Check for PCV valve malfunction.
• Check for incorrect valve timing due to jumped timing belt.
• Check for restricted exhaust system.
• Check for intermittent open or short in fuel pump circuit.
• Check for inadequate fuel pressure.
• Check for fuel line and/or fuel filter restriction or clogging.
• Check for pressure regulator malfunction.
• Check for APP sensor misadjustment.
• Check for TP sensor misadjustment.
• Check for fuel pump mechanical malfunction.
• Check for fuel leakage from fuel injector.
• Check for fuel injector clogging.
• Check for intermittent open or short of MAF sensor, APP sensor, TP sensor and VSS.
• Check for ATX malfunction (ATX).
• Check for spark plug malfunction.
• Check for spark plug wire malfunction.
• Check for clutch slippage (MTX).
Jun 22, 2010 at 9:23 AM
