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Old 08-11-2010, 03:07 AM   #1 (permalink)
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Angry Low revs, wants to stall; also backfiring.

Hey everyone.

Im rather new to this site and a reasonably new owner of a 1990 Suzuki Sierra.
Ever since ive owned it it has been nothing but problems. I found out it had a cortina carby on it which was causing reving problems and major backfiring. I soon replaced with a sierra carby which resulted in no more problems. That was 4 months ago... since then my clutch and brakes went which have been replaced. Its been running great for 2 weeks since i got my clutch replaced, now all of a sudden it giving me problems again..

last night the revs sat at about 500rpm while idling. It wanted to stall on me so i had to try to keep the revs up. when i turned my lights on it kicked the revs up to about 1000rpm. Still when i came to a stop, it was gargling real low. if i was to turn the lights off it would most likely drop out, or come damn close! Along with that I could hear small popping backfiring coming from the exhaust when i was cruising in gear with the revs up. Today was the same deal, and im sure tomorrow will be worse. Today I got a HUGE backfire which scared the crap out of me, and probably everyone around... I havent had one of those since before changing the carby...

Can someone please help in any way? Im really getting tired of having this car on the road for 3 weeks at a time before something goes wrong. Its a great little car though so I want to keep it healthy and hold onto it.

Any assistance will be greatly appreciated.

Cheers!
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Old 08-11-2010, 03:37 AM   #2 (permalink)
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Hi Muncherra.

The first thing I would do is to check the ignition timing. You can do this with an ignition lamp that you plug into the nr 1 cylinder's spark plug wire, or you could just loosen the bolt that holds your distributor in place. While your enginge is running, turn the distributer a bit to eiter side. If you turn it to one side you will find that the idling goes higher. This means that your timing is faster. Hold the distributer in place and rev it a little bit with your other hand. You want the revs to pick up fast, without hearing a ping-ing noise from the engine. If you hear the ping (or knock) your timing is too fast, and you should turn it slower again. Once you have set this, you can adjust the idling on the carburettor again.

I hope this helps. I have read a troubleshooting guide, and it seems that most backfiring problems have their roots somewhere in the electrical system. So I would check the whole ignition system (coil, spark plug wires etc.) if I were you.
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Old 08-11-2010, 09:33 AM   #3 (permalink)
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I don't know much about the 2000 jimnys, but backfiring is usually due to unburnt fuel being dumped into the exhaust. This happens when a cylinder or cylinders misfire. That will dump the fuel/air charge from the misfiring cylinder into the exhaust where it will detonate or backfire.

Misfiring cylinders can be from electrical faults in the wiring, plugs, ignitor or coil. It can also be from timing problems. Another common cause is vacuum leaks. If you've recently installed a new carb, check the mounting at the base of the carb. The gasket can settle, or the nuts work themselves loose, allowing air to suck in around the base.
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Old 08-22-2010, 07:33 PM   #4 (permalink)
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Thanks for the ideas guys.

The Sierra has been running better since I cleaned my distributor points and rotor. Backfiring has almost completely stopped as I took it for a good 100km drive. I am going to get the timing done today so hopefully that will allow it to run smoother as it is probably slightly out.

Everytime i turn on my headlights or heater fan my revs will jump up about 1000rpm from idle. My research has been telling me that it does that do charge the alternator? I hope it stops otherwise hopefully a throttle body adjustment or timing will help that problem.

Learning slowly and enjoying it , appreciate your guys work!
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Old 08-23-2010, 09:25 AM   #5 (permalink)
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when you turn on the accessories that put a load on the alternator the engine ramps up the RPM so it doesn't stall out. When the alternator is working hard, it puts an additional load on the engine. The idle up also will come on with vehicles equipped with AC when the AC compressor is activated for the same reason.
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Old 08-23-2010, 08:44 PM   #6 (permalink)
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Thanks Baratacus.

I found info on adjusting the idle up screw on the side of the carby. I turned my lights on and adjusted the screw back until it was idling at about 1000prm. When i turned the lights off it remained at 1000 which is perfect!

Gotta love these forums!

Cheers
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