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Sc400 loss of power, runs rich, loud
I recently bought a 92 sc400 and it ran perfect for about 2 weeks before randomly messing up one morning when I tried to start it. Issues: Before any major issues, the car randomly stalled at stop lights every once in a while. Barely wanted to start, cranked and cranked until just barely starting up. Next, I tried driving down my street and it bogs down when I floor it, but will get up to speed when I slowly accelerate. Drove it around fine, up to 50 mph but like a slug. In first gear it drives pretty nicely, but as soon as I put it in second gear it won’t go above 1k rpm. So far I’ve tried replacing: Fuel pump ecu spark plugs ignition coils sent ECU to get fixed. Right now I’m investigating the camshaft/ crankshaft position sensors. The info I’ve found on symptoms of bad ones matches pretty closely to what issues I have. But I’m not sure whether my issue is cam or crank position sensor. I’ve also checked the throttle body, it’s pretty clean and snaps perfect, opens all the way when floored in accessory mode. After sitting in my garage a few weeks,and turned on a few times it also started misfiring pretty bad when revved up. Sounds like 2 step. Any help with this would be greatly appreciated |
Bump? bump? |
Another user recently posted about a similar issue and found his o2 sensors were bad, it might be worth a shot to check them out.
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Any engine codes?
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I recently posted this, my o2 sensors were black. still haven't replaced them
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Originally Posted by Braaap1uz
(Post 10200150)
I recently bought a 92 sc400 and it ran perfect for about 2 weeks before randomly messing up one morning when I tried to start it. Issues: Before any major issues, the car randomly stalled at stop lights every once in a while. Barely wanted to start, cranked and cranked until just barely starting up. Next, I tried driving down my street and it bogs down when I floor it, but will get up to speed when I slowly accelerate. Drove it around fine, up to 50 mph but like a slug. In first gear it drives pretty nicely, but as soon as I put it in second gear it won’t go above 1k rpm. So far I’ve tried replacing: Fuel pump ecu spark plugs ignition coils sent ECU to get fixed. Right now I’m investigating the camshaft/ crankshaft position sensors. The info I’ve found on symptoms of bad ones matches pretty closely to what issues I have. But I’m not sure whether my issue is cam or crank position sensor. I’ve also checked the throttle body, it’s pretty clean and snaps perfect, opens all the way when floored in accessory mode. After sitting in my garage a few weeks,and turned on a few times it also started misfiring pretty bad when revved up. Sounds like 2 step. Any help with this would be greatly appreciated |
Mine was disintegrated distributor rotor and cap.
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Wouldn't that cause it to not start at all?
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Mine missed, ran but only on 4 cylinders. Way do in on power. Two distributors,two coils.
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Yeah not the same problem as mine than, occasionally it runs fine and it's not misfiring.
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I'm new to them 2. Frustrating. Try pulling codes. Obd1 though, oriely may be able to help. Let me know, curious
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No codes. Never threw any.
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Mine as well
My 92 sc400 is doing the same...if you've had any headway on this matter I could definitely use the remedy.
thank you for sharing your troubles |
I’ve found that it’s the ECU that’s messed up. I even had it rebuilt but it’s just completely dead at this point. I’m looking at working used ones |
Originally Posted by Braaap1uz
(Post 10379891)
I’ve found that it’s the ECU that’s messed up. I even had it rebuilt but it’s just completely dead at this point. I’m looking at working used ones |
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