Cylinder misfire code po301 random cylinder misfire has good spark new plugs wires coil and module injector is pulsing with a noid lite no fuel leakage has 125 lb compression and the injector sounds good with a stethescope new intake gasket new plenum cleaned throttle body and mass air sensor any suggestions?
I have an 01 impala 3800. After 2 months of searching for the source of the misfire that was causing my car to surge, stall, and generally not run well; I rebuilt my tranny, because it needed it, and in hopes of finding out something more. Well, when I put everything back together I stumbled on to a fuel leak on the rear fuel rail fuel supply line connector. In the process of trying to figure out what the problem was I\'ve been through many, many forums and a hellava lot of people have had the same problem and racked their brains and spent thousands of dollars. Long story short, I replace the connector with a $20 kit, right off the shelf of the local parts store, and the problem is fixed.
SOURCE: 2004 cavalier 2.2 vin f
I have expereienced this issue several times on the 2.2 ecotech usually ends up being the ignition module itself. I keep an extra module handy just for testing purposes.
Condition/Concern:
Some customers may comment on a severe engine misfire and a SES Light. Upon inspection, DTCs P0300 - P0304 may be found due to misfires on cylinders 1 and 4 or cylinders 2 and 3.
Recommendation/Instructions:
If this concern is encountered, inspect circuits 406 (IC Control for 2/3 Coil) and 423 (IC Control for 1/4 Coil) for an intermittent short to ground or poor connection on either end. Depending on the model, these circuits may short on the AC lines near the AC compressor, on the transmission mount, or on the transmission lines where they enter the transmission. If there is no problem found with these circuits, inspect the ignition control module ground to ensure that it is clean and tight.
If there is no problem found after performing the suggestions above and the SI diagnostics lead to ignition module replacement, replace the ignition module as directed but also replace all of the spark plugs and clean the ignition module ground to possibly prevent future ignition module damage.
Measure the resistance of the ground circuit of the ICM from the harness connector of the ICM to a good ground. This should be 3 ohms.If it is not replace the module.
SOURCE: misfire cyl's 1,3,6
Have you tried replacing the ignition coils? If they get old and stop working, or if they're damaged, they won't send a strong enough spark to the plugs. AutoZone (I think) apparently does free diagnostic codes for a check engine light. I don't know if you have a check engine light on or not, but maybe the light burned out? It might be worth a try to call them and ask if they can check the codes for you for free.
SOURCE: 1989 Cavalier Z24 Stalling problem
Have you heard of Noid lights? You unplug the fuel injector and plug these in and they will light up if the injector is getting power. This might give you a better hint. There are also lights that go inbetween the spark plug and wire. Between these two items you may be able to narrow down the problem to a specific system. I believe that your car has a coil pack. Some of these engines have problems with the crank trigger. I believe it is located on the back side of the motor. If you decide to change it, be careful. I have heard of them breaking into two pieces and becoming a big problem.
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