Engine Misfire Codes
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Engine Misfire Codes
Hey guys, 4 weeks ago I finally got my tune, and I love it, it really brings the car to life. The week after the tune I changed oil, oil filter, and plugs as my car just hit 100K miles. The week after the oil change my check engine light came on, but turned off before I got the chance to have it checked. Well, a week later and its on again so I just got the code read and its throwing misfire codes on all 4 cylinders as well as a P0300 code. Any suggestions on where I can start to fix this issue?
#2
I had a misfire on cylinder 4 when I was tuning and replaced the coil pack for it and it was fixed. Maybe you need all 4 coil packs or you need to verify the gap on your plugs?
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I dont feel any misfires, even under heavy acceleration. Ever since the tune cold starts lope hard as hell like it has a cam. Other than that I havent noticed any performance changes. No flashing CEL, it just stays on.
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jdbaugh1 (02-16-2018)
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AcDelco irridiums, not 100% sure about the gap. The lope started immediately after the tune and before the misfires started showing up.
#9
In short... It was tuned for power enrichment and not overall. Sad but common.
Last edited by Henry3959; 02-16-2018 at 05:22 PM.
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Just verified the gap at .032 so that's not it. I'm at the tuner today so I'll see what I can get him to do to the idle to see if it's during cold starts.
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Is there anything else he should know? I don't know a thing when it comes to tuning and he doesn't have much experience with LNFs
#14
With HP Tuners he can force it into Open Loop and see how rich he has it. That is why it is there.
#15
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You can't with the LNF, it's not a standard GM ecu with a VE table. It has a wideband sensor stock, so it adjusts the trims so someone can adjust the maf table from the trims. There is no VE table for an LNF since its a torque based ecu.
#17
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You still have fan control, but none on the fuel pump. Also no active adjustments (or whatever it's called) so timing and VVT adjustments require reflash. It's a Bosch ECU and supporting system similar to VAG systems
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