93 SC400 supercharged
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From: ny
93 SC400 supercharged
i was driving my car for about an hour down the expressway. Started running really rough about a mile from my destination. I managed to limp it to where I had to go. Now it barely starts and won’t respond to throttle barely, sometimes if I catch it at half throttle it will rev up smooth. I have a 92 I’ve been using for parts. I’ve changed ecu, cam sensors, crank sensors, all relays, and re-timed the belt. The car is lowered and did rub through harness on lf , but I fixed wires properly and relocated. If I move the harness it doesn’t change. I’m e mechanic and I can’t figure this out. I checked spark, test light didn’t light up but it got me, it’s getting spark. Any help would be greatly appreciated.
The next easiest step would be to check the fuel pressure and if you haven't jumpered the fuel pump relay now would be the time to do it. Also, it's possible both ecu's were bad, it wouldn't hurt to open both of them up and check the capacitors.
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I don’t have a fuel pressure guage this style. The gas guage doesn’t work and I drove about 30 miles with gas light on. I’ve tried the fpm bypass and another fpcm. It almost diesels when it shuts dow.
You can rent a fuel pressure tester with all kinds of adapters from most chain type parts houses for around $20 and you'll get that back when you return it. If you consistently drive on the low fuel warning light its possible the pump has finally burned out.
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This is actuallly the first time I’ve driven the car. Guage said half tank, looked down and noticed gas light on. I can hear the pump coming on with key on. What concerns me the most is the white smoke coming out of cold air intake while cranking. Open throttle plate and smoke gets sucked into supercharger.
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Figured it out. Had a a/m fuel pump and pig tail in it. Fixed connections and replaced fuel pump from parts car. I put seats back in car, is a/m pump worth putting back in to try? It looks a lot different that the factory one.
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From: arizona
Well if it flows more fuel then stock, yes you’ll need it considering your car is supercharged...Do you have an AFR gauge?
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Driver School Candidate
Joined: May 2018
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From: ny
Update, car died again. Ran for a day or two now it’s doing the exact same thing as last time. I can’t hear pump coming on this time, last time I could. The wires from the part the pump mounts to are all kind of discolored. Gonna try putting the one from my parts car in it today. Along with original am pump. I’m getting very stressed and annoyed with this car, it’s my second SC400, first one was stock and ran like a champ. This one I haven’t been able to make a round trip yet.
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