Thread: Engine problem
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Old 03-17-2019, 09:46 PM
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Squidward Squidward is offline
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Join Date: Dec 2002
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Where is JLMounce? I'm pretty sure he listens to efi audio books while he sleeps!

Data logging is good. I'd try to get a good graphical overly of rpm, tps, target afr, actual afr, map, fuel trim, etc. for various driving conditions - idle, cruise, wot. I'd be curious where the mismatch might be on target vs. Actual afr.

Since you have an o2 sensor fault, I'm not sure if your "displayed" afr will be accurate. You might want to also pull your plugs to validate rich or lean conditions on one/all cylinders. There is only one o2 sensor and a batch fire of fuel, so a faulty lean cylinder could cause all to be rich, or a misfiring cylinder might cause all to run lean. You would see a condition like that on your plugs or in the fuel trims.

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