BACKFIRING - COWL INDUCTION - Team Camaro Tech
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post #1 of 9 (permalink) Old Jan 14th, 01, 10:08 AM Thread Starter
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I'm new to this, so please don't laugh. Took my '69 Z11 out for a spin today and the car was backfiring (popping) at lower speeds 35-45 mph as I was cruising . Needless to say, I felt like an idiot. My first inclination was to replace all the plugs and set the timing (points disttributor). I pulled up and hood and checked the plug wires, etc... I did however notice that the valve cover to air cleaner hose was disconnected. Could this have been the problem?
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post #2 of 9 (permalink) Old Jan 14th, 01, 11:20 AM Thread Starter
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Reconnected the hose and it's still backfiring. Fouled plugs or timimg adjustment??
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post #3 of 9 (permalink) Old Jan 14th, 01, 12:55 PM
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Plugs, wires and distributor cap, that's where I'd start. If that doesn't help, I'd starting looking at the carb. Does it only do it at a certain RPM, or only when accelerating or decelerating? KZ

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post #4 of 9 (permalink) Old Jan 14th, 01, 08:23 PM
 
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mine bogs real easy and backfires through carb when trying to accelerate too hard on a cold engine. is this timing (which I thought it was), or should I check my plugs and stuff?
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post #5 of 9 (permalink) Old Jan 14th, 01, 11:31 PM
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for the both of you..timeing! and or rich...possably wetness inside the cap, this happen's on cold wet day's. i would also pull a plug and check it out to see if it is runing rich. it might be lean if you tuned the carb on summer gas...cause winter gas is formulated diferant..it is more volitiale and vaporizes better. and if you are runing too much vacume advance this happen's too..use the timed port off the carb..the one that has no vacum at idle but get's it as the motor rev's up. also try to let the old baby's warm up first...i have to on my 67 camaro and my 85 blazer....or they drive like s#%@t. that is because they have no air preheat. that help's alot in the winter..if you do not have a heated intake. or you have blocked the heat riser passage's off. ib the winter your carb might be too cold and this happen's too cause the fule is not atomizing corectly...hope this help's.
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post #6 of 9 (permalink) Old Jan 15th, 01, 04:14 AM Thread Starter
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The car recently came from California and was seldom driven. I put Super unleaded when I got it and drive it to get an oil change (about 5 miles) and it drove fine. This was about a week ago. It was nice yesterday and I drove it to "blow" it out and it started to backfire and low rpms. I did however wash and detail the engine compartment last week but was very careful to not get the distributor wet. The plugs however were left as is.
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post #7 of 9 (permalink) Old Jan 15th, 01, 04:49 AM
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Danny, pull a couple of the "easy" plugs and see what they look like. If they are fouled, you will know it. I'd throw another set in there anyway, just for maintenance purposes. What do the wires look like? You can't go wrong with a basic tune-up. If you would have driven it over to my house on Saturday, I would have fixed it up for you! Ben and I made alot of progress on the power steering conversion. I'm hoping to finish it off tonight, I needed a new pitman arm. Are we still on for the Superbowl? I think Ben said he would be able to make it......KZ

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post #8 of 9 (permalink) Old Jan 15th, 01, 05:32 AM Thread Starter
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John - Sorry I couldn't make it Saturday. I was in the office crunching numbers for yearend. Yes! We are on for a Super Bowl party at my house - beer, burgers & dogs! I may decide on T-bones! I'm assumming that a "fouled" plug is dirty and black?
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post #9 of 9 (permalink) Old Jan 15th, 01, 06:03 AM
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Yes, dirty and black, and probably wet looking, smelling of gasoline. They should be a nice off-white color when everything in the combustion chamber is working normally.
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