Backfires when put in to drive

Tiny
BESTAUTOTECH
  • MEMBER
  • CHEVROLET SILVERADO
Hello, I got a 1988 silverado c1500 5.7 liter automatic. The engine was rebuilt 3 years ago guy said they put a cam in it for towing. It ran fine until about 2 months ago. It started running rough and couldn't get up to speed. So I parked it and tuned it up. Replaced plugs, wires, cap, rotor, fuel filter, and airfilter. Then it wouldn't start. I change the fuel pump, coil, throttle body (with a used one that work just fine). It cranks over just fine checked spark and it was orange was told that it was to be blue. But I noticed that the injector were dumpin fuel in the intake instead of sprayin or I add a bit just to see what would happen it fired up and ran like a champ. After about 30 mins of idling I put it in drive and it backfired like crazy and stalled. It would start right back up but then it started to backfire while idling and then quit but still backfires like crazy in drive. Was woundering if a weak spark would cause this. Or maybe jump a tooth of the timing chain. I can go out side right now after a week of sitting and it fires right up with a couple of back fires and is idles smooth. Better then it did better because I tuned it up but it never back fired before. Maybe it could be a messed up cam i'm lost need some help please thank alots dustin
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Monday, October 1st, 2007 AT 9:13 PM

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Tiny
BESTAUTOTECH
  • MEMBER
Well I think I got some hints for this guy probably should check compression and that will tell me if it is in the engine. And got another qeustion for you pros. Would an engine idle good then back fire like crazy if one of the electronics are bad like the ignition control module. It would explain the orange spark. I will buy I compression tester when I get paid. Bet obody can tell I got a two year acc. Degree. Lol thanks alot
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Wednesday, October 3rd, 2007 AT 5:24 PM

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