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Old 08-28-2009, 04:48 PM
palik1
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Exclamation 1997 Quest Misfire problem

I have a 97 nissan quest with a 3.0L motor...I have a random cylinder misfire that occurs when cruising at around 45mph at 1500rpm's.. at wide open throttle the motor looses all power and acts like it hits a rev limiter at 4500rpm's ( it is strong up to that point) altho you can rev the motor past that point in neutral but not at WOT, at WOT it stopps at about 5K RPM's. I have replaced all 6 injectors, knock sensor, fuel pump, timing belt, cap, rotor, plugs, wires, fuel filter, air filter, mass airflow sensor, distributor, ignition coil, pcv valve and tested the EGR valve and there has been no improvement...

When I brought it to the local Nissan dealer said that it is leaning out and when they adjusted the air/fuel ratio it ran great but they don't know what is causing this..the only code that is on the computer is a multiple cylinder misfire.

I inspected all vacume lines and could not find a leak.. Please Help!!
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