I have the K engine Thanks for the PSI info. My psi is 43 at idle to 49 at about 2000 rpm, must be my hesitation problem, although when I unhook my MAP sensor car seems to run fine. Heard that low fuel pressure will bring up a MAP sensor code, does that sound logical?
April, 11, 2009 AT 6:49 PM
Hesitation: Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)
Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include: Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires