4.2 straight 6 pinging - Jeep Wrangler Forum

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Old 08-23-2009, 12:10 PM   #1
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4.2 straight 6 pinging

Hi guys, I'm new here but I hope you can shed some light into my problem? I have a 84 CJ with a 4.2 straight 6 that has a Mopar Fuel injection for a 94 4.0. The problem is the engine starts pinging at about 2500 rpm under a load. What am I missing here? Is the wiring harness not correct or do I need to change the ECM? Please advise,,, I do appreciate any thoughts you may have to resolve this issue.

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Old 08-23-2009, 08:05 PM   #2
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.easy thing to check is first is timing..fuel quality

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Old 08-23-2009, 08:24 PM   #3
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what grade of fuel are you running. I know on both my 79 and 85 they didn't do well on 87. Thus when I would run a higher grade 89 or 91 they where fine.. However I didn't have fuel injection.
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