Misfires

Ghostvette · 11-12-2018, 03:22 PM

Quote:

Originally Posted by JSur

Has anyone ever experienced power draw that drains the battery within days and fuel cut/misfiring from a bad starter and alternator? The car has been acting up pretty bad recently and my starter just fried. In the process of figuring that out we discovered my alternator is on the way out the door as well. Any accessory, when my voltage got low enough, would trigger a misfire or lean out on me. It even got bad enough at one point to where the blinker and auto window up/down would trigger a misfire or fuel cut. I’m currently going through the car and all it’s fuses etc but I would like to hear your thoughts and opinions on whether a bad alternator and starter could be the root cause of this power draw that’s been haunting me. Thanks

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If issues decreased with a new battery, then there are several things to consider. Reading through the posts, it appears you are replacing the alternator, that's good. Based on the numbers you posted, 13.1 VDC is barely enough to keep the battery charged, much less run everything else. A good alternator puts out between 13.5 & 14.5 VDC. Check all your grounds, make sure they are all clean and secure. A bad ground will raise havoc in any electrical system. If you are running an amplifier and not running a 1 to 2 farad capacitor, you are killing your alternator. Just some thoughts... good luck.

JSur · 11-13-2018, 06:32 AM

Quote:

Originally Posted by Ghostvette

If issues decreased with a new battery, then there are several things to consider. Reading through the posts, it appears you are replacing the alternator, that's good. Based on the numbers you posted, 13.1 VDC is barely enough to keep the battery charged, much less run everything else. A good alternator puts out between 13.5 & 14.5 VDC. Check all your grounds, make sure they are all clean and secure. A bad ground will raise havoc in any electrical system. If you are running an amplifier and not running a 1 to 2 farad capacitor, you are killing your alternator. Just some thoughts... good luck.

I do have a capacitor for the sub/amp. I actually re-grounded them both straight to the frame a while back. They were originally installed with the ground from the amp going to the capacitor ground, then into the frame, so I gave them both a direct ground and that didn’t fix anything. If my battery still drains after replacing alternator and starter then I have to dive into all the grounds. Thanks for the input

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Rusty · 11-13-2018, 07:50 PM

To see how many amps the system is pulling. You should put an amp clamp on the positive battery cable. And run the car for a while.

11-13-2018, 07:50 PM	#3 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,369 Drives: 2011 Nismo GM 6M Rep Power: 2684438	To see how many amps the system is pulling. You should put an amp clamp on the positive battery cable. And run the car for a while. TBatt and JSur like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html