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Old 04-16-2019, 06:52 PM   #1 (permalink)
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Default Bad alternator?

So I finally got my car out today. It’s a 1996 SL that I put a turbo in. I was having turbo troubles and finally got it out and I drove it for a bit and it drove perfect. Boost was ~7psi, pulled strong, felt awesome. All of a sudden, every time I hit 6 or 7 psi, the engine would seemingly cut out. Then, the speedometer would read 0-100 rpms, and whenever my blinker was on, the tachometer and speedometer would move with the blinker (it was kind of comical in a rather terrifying situation), and it almost seems like it’s DEFINITELY a bad alternator, but when it first began to die there was a lot of smoke, and I don’t know if this could mean that something worse happened (cracked head, etc., cause I’ve never had that happen to me), or if it could simply be that my oil return pump (midmount turbo) caused excess oil to seep in my exhaust. Thanks a lot for any help you can give me!
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Old 04-18-2019, 06:55 AM   #2 (permalink)
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Default Re: Bad alternator?

being a turbo converted SL could have something to do with that, the smoking that is

Is it VR4 Engine with turbos or SL Engine with SL ECU and just slapped on turbos? I don't Think it's a good idea to turbocharge the SL Engine. Especially not with SL ecu and injectors.

but the symptoms you described with tacho and blinkers sounds like bad alternator. Check your voltage while at idle. Should be 13+ 13.5-14.x preferably. Could be blown alternator fuse. Check the large alternator fuse in the large fusebox in Engine bay.
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Old 04-18-2019, 10:25 AM   #3 (permalink)
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It’s an SL motor with a turbo on it. It is only running about 5psi. I ran it for about a month in the fall before the throwout bearing caused me some issues. Also an update, I found a blown alternator 120A fuse. Clearly an issue with the alternator😂 I’m curious if it smoked because the oil drain pump died...but I was worried about the smoke cause I was worried it would be a blown motor. I’ve never experience a blown motor
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Old 04-18-2019, 10:27 AM   #4 (permalink)
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And the injectors are VR-4 360cc with a MAF-T. Also, I am going to take a multimeter to all the points between the alternator and the battery and to the alternator itself to find a short. Any pointers for that? I appreciate any help
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Old 04-27-2019, 06:42 PM   #5 (permalink)
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So I now have gotten the new alternator in, the car starts up and runs alright, but I have this “putt putt putt” sound coming from my exhaust, as well as slight shaking from the engine. I rev it up and the putting sound continues into about 3000 rpms. Engine warmed up and it got a bit better, but not perfect. Almost sounds like a misfire, but it isn’t throwing codes. I checked all my grounds, etc around the alternator and they seem fine. Car is jacked up on the drivers side and a little low on gas. Could that be the issue? Or does it sound like something worse? When I was tightening a bolt on the alternator I was leaning on the timing belt (had the cover removed for a little extra room) and I heard a little pop, not sure if it was from the timing belt or something around it. Could this have something to do with it? Thanks so much for the help!
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Old 04-30-2019, 06:28 AM   #6 (permalink)
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What are you tuning with?

You have a lot of variables. I'd definitely make sure there's good gas in the tank before continuing to troubleshoot.
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