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On a 1990 chevy with cruis control i changed plugs drove about 140 miles the next day it started to back fire thro the carb and cause a fire to start in carb what would cause this

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Cross firing spark plug wires is the most plausible cause, did you replace them? If not do that and route the wires like the factory wires where and use spark plug wire looms if the old ones are missing or broken, this is very important. Any good auto parts store can sell you new looms or you can buy them on eBay Motors

Posted on Dec 06, 2016


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Well it sounds like you've started to do your "due diligence", but there are several things left out. Your problem could be many things. Something as minor as a vacuum hose left off, loose, or in the wrong place. And just because you changed the plugs and wires, don't mean you fixed your problem. Open your hood at night and see if you have any sparks "dancing" around. Another way to check this is to open your hood and spray a soapy water solution on your plug wires and look for sparks jumping around. If so replace your wires. You didn't mention what type of wires and plugs you used. I would reccommend NKG platnum plugs and a Bosch wire. I know this from experience,(the hard way teacher). It could even be the gas you are burning. I've owned a lot of Vettes, and I am the kind of guy who believes they should be driven. If not it's like having a beatiful wife and never taking her to bed.I know a lot of people who only drive them "once in awhile". Sitting in thier garage can cause many fuel problems, condensation, sludge in the carb, or filters etc. This can all lead to the problem you are describing.
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