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Old 03-20-2012, 08:17 AM
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Stop timing unplugged

Good morning, i have a 1990 Chevy 3500, extended cab, long bed,454,700r tranny. my problem is, when you start it, it some times smokes black, i think to much fuel, when you crack the TBI open about a quarter of the way, it loads up and sometimes pops. When you put it in to gear, it dose ok till you get about a quarter of the fuel, then it loads up, chugs, pops,but if you make it pass that part, it dose ok. I unplugged the stop idle, and it runs great, i can smoke the tires, you can hit the TBI as hard and as fast as you want, and it wont load up or smoke, but every time i put it in gear or come to a stop, i have to power brake it, to keep it from dying. Its a timing problem for sure, but not sure what kind.

Thank you...

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Old 03-23-2012, 07:26 AM
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Do you have alot of miles on this engine?Sort of sounds like a fuel metering problem.Fuel regulator maybe gone bad.But first Id check the timing,if its backfiring thru the TB then it has to much advance.Also could be a worn out timing chain & sprocket.Black smoke means way to rich.Check the fuel regulator to,you'll need a fuel pressure gauge & a book to tell you where to connect to.Another thing go some where an have your obd codes read even if you don't have a check engine light on.Some times that makes it even more confusing.
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Old 03-23-2012, 07:42 AM
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Stop Timing

Thank you Dogwater, it dose sound like timimg, but only when the stop timing is plugged in, when you unplug the stop timing, it has all the power you want,i can power brake 20 feet easy, no black smoke, no lugging, no power loss, its all good except, the low idle is too low and you have to power brake it slightly to keep it running,when you put it in gear or stop, and the check engine light stays on.


Thank You...........
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