Misfires

JSur · 11-18-2018, 04:43 AM

Update on my issue. Starter and alternator have been replaced. Car starts. Runs great at wide open throttle but still misfires and is only giving me mid to high 13’s for voltage. Found two codes, that don’t throw check engine lights, that lead to a sensor in the negative wire coming off the battery that apparently controls voltage to the alternator. I’ve never even heard of this. So that’s what I’m digging into next. These cars have too many sensors lol

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Ghostvette · 11-19-2018, 07:52 AM

Quote:

Originally Posted by JSur

Update on my issue. Starter and alternator have been replaced. Car starts. Runs great at wide open throttle but still misfires and is only giving me mid to high 13’s for voltage. Found two codes, that don’t throw check engine lights, that lead to a sensor in the negative wire coming off the battery that apparently controls voltage to the alternator. I’ve never even heard of this. So that’s what I’m digging into next. These cars have too many sensors lol

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Ground..... it's always ground....

The alternator has to have power from the fuse box for field power, which also means, a ground back to the battery. You may have to run that wire(s) and check for burnt spots that might cause intermittent shorts. You're on the right track.

dts3 · 11-19-2018, 08:48 AM

Quote:

Originally Posted by Ghostvette

Ground..... it's always ground....

It's impossible to say that too many times!

And it's always the hardest problem to find (as you have discovered) Good luck; make sure to keep updating this thread.

11-18-2018, 04:43 AM	#1 (permalink)
JSur Base Member Join Date: Mar 2016 Location: Orlando Posts: 84 Drives: 2011 370z TT Rep Power: 10	Update on my issue. Starter and alternator have been replaced. Car starts. Runs great at wide open throttle but still misfires and is only giving me mid to high 13’s for voltage. Found two codes, that don’t throw check engine lights, that lead to a sensor in the negative wire coming off the battery that apparently controls voltage to the alternator. I’ve never even heard of this. So that’s what I’m digging into next. These cars have too many sensors lol Sent from my iPhone using Tapatalk Ghostvette and bunk like this.