Quote:
Originally Posted by RZNT4R
I would be surprised if it was the coils as the misfires apprear to be a symptom, not the cause. Misfires create LEAN exhaust gases, so your STFT would go UP.
It's counter intuitive as you'd think "dumping fuel in the exhaust would read rich", but while it's dumping fuel in the exhaust, it's dumping 14x more air in the exhaust.
But anyway, I would equally be surprised it if was injectors because cylinder one goes to shit both in DI and PI. mentions of low intake vacuum may be onto something, I just went to mine and it idles at 4.3 PSI/29.7 kpa, so yours is definitely high... Might have tight valves, how high is the odometer?
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131k miles original engine.
Cleaned all 8 injectors through CSG so I’d be shocked if that was the culprit. Installed them yesterday.
Cleaned intake valves as best I could with Seafoam and CRC while the intake manifold was off.
New all 4 OCV’s
Just cleaned MAF and posted logs above.
Low intake vacuum ��
I’ve tested myself and had a shop do it. No leaks.
Any suggestions to plug in points on how to test? Maybe I did it wrong?