Misfire during idle at at light throttle
#1
Misfire during idle at at light throttle
Hi everyone, so I've been experiencing a miss at idle at very light throttle for quite a while now. I took the car the bell engineering and did a compression test and leakdown and my 4th cylinder was missing for some reason. We determined it was the rings in said cylinder so I ended up building my bottom end but I still have the same miss. Performed another compression test and my results were: 140, 140, 148, 140. With three cranks for each cylinder using a crappy gauge. Just tried switching the cam and crank sensors which didn't make any change. Thoughts are it wouldn't be the coil because I would have 2 cylinders missing. I've changed the order of my injectors and spark plugs and miss is still in the same cylinder. Help!
#12
So I have an update on my issue. I've got the car driving again and got to do some logs and try to tune some. From looking at the logs, it seems my battery voltage is erratic in the same way that my afr is. Here is a couple screenshots and the log. What would make my voltage all erratic like that?
#13
Different log taken today because for some reason I can't load the other one..
Edit: Also I had trouble when I first installed my ms with my nb alternator so I swapped in an internally regulated na alternator and wired it accordingly. Not sure if maybe that has something to do with it
Edit: Also I had trouble when I first installed my ms with my nb alternator so I swapped in an internally regulated na alternator and wired it accordingly. Not sure if maybe that has something to do with it
Last edited by cowboys647; 04-09-2013 at 05:55 PM.
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