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2002 Malibu 3.1 V6 P0300 FIXED

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    DarrenDarren
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      Hi everyone,

      I am trying to narrow down what is causing a P0300 code, low power, and hesitation on my sister’s car. It has 44,000 original miles, but has not had any maintenance or repairs its entire life. So far I’ve changed plugs and wires with AC Delco parts, checked fuel pressure (50 psi @ idle 60 psi @ full throttle,) used one of those cheap in line spark testers on each spark plug wire off of the coils. The engine is running as if the catalytic converter is clogged, but I get good pressure coming out of the tailpipe. My suspicion is that the ignition control module is faulty as I know those are common failure items on these cars. One interesting thing, The two outside coils had a noticeably dimmer flash on the spark tester as opposed to the center coil. I’ve heard of the ignition modules warping, but I have never seen it in person. I would appreciate any suggestions before I tell my sister to shell out $300 on a new ignition module. I should also mention that the check engine light flashes under hard acceleration, which I know is a misfire, and the exhaust has a sulfur smell to it, which I assume is due to raw fuel going into the catalytic converter.

      UPDATE:

      After verifying the engine had good compression, spark, fuel pressure, injector pulse, and MAF I removed the catalytic converter and the car immediately had all power restored. This proves that it is possible to use process of elimination and simple diagnostic tools such as a test light and multimeter. It was very tempting to throw parts at this car and hope for results, but honestly, the catalytic converter would have been last on the list. Save your money and properly diagnose your vehicle. Eric, and many other youtube mechanics have taught me to never assume and think things through.

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