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02-25-2006, 02:40 PM
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backfire from carb
Im having a problem getting my engine to run. Everytime I start it it backfires out of the carb. I had a BG demon on it that was new and it ran ok a few times and then this started happening. So i had it rebuilt with new powervalve and it still happens. then I put an edelbrock on there and it still happens no matter the timing location on the distributor. I checked all the valve lash and spark. The only thing I can think of is cam timing, but it ran ok when first rebuilt. Another thing to add is if I get it up to about 160 degrees or better it begens to run ok. Im lost. any suggestion?
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02-25-2006, 02:43 PM
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Sounds like you have a broken rocker arm, or bent pushrod....on the exhaust.
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Ontario Rodders
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02-25-2006, 03:19 PM
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yea maybe a bent rod. Ill probly have to tear it down to see if my pistons are tapin the valves.
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02-25-2006, 03:50 PM
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Just take the valve cover off.....You will see right away if thats your problem. What may be happening, is that the exhaust valve isn't opening, so the exhaust gasses have nowhere to go, but back up through the carb.
Make sense?
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Ontario Rodders
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02-25-2006, 04:03 PM
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Doc here,
 What Ignition System do you have? Doc
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Aftermarket Solutions Electronic & Electrical Innovations
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02-25-2006, 04:08 PM
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Mallory HEI
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02-25-2006, 04:20 PM
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Doc here,
Try this, On a dead cold engine, using a heat gun, or (if you have lots of time) a Hairdryer, heat the base of the dizzy up to about 180..then try and start it, If it runs better (as it did on a warmed up engine) replace the module. CHECK AND DOUBLE check to see 5 and 7 aren't reversed too..It will cause this exact problem. and their the ONLY two wires that are next to each other on BOTH ends..HAND OVER HAND them to be sure they are correct. Stuck Valve or over adjusted as poncho said will do the same thing too..Check that with a Vacuum gauge, Should be 17 to 20 In HG at idle with NO needle flucution..If the needle is all over the map..check your valves. Doc
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Aftermarket Solutions Electronic & Electrical Innovations Last edited by docvette; 02-25-2006 at 04:22 PM. Reason: bumbling bigthumbitis..most used key..backspace
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02-25-2006, 05:05 PM
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ok, thanks very much for the help.
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02-25-2006, 06:26 PM
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it could also be a stuck valve too... not opening or closing the way it should...
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02-25-2006, 08:05 PM
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I just remembered something, when the motor was running good,. I ended up shorting the old A/C compressor hot on the frame and cooked the rubber right off it and the alt. wire, once I fixed that wire was when it started running like crap,. would that short have effected the ignition module? It wasnt like just a pop it was shorting on it for probley about 10-15 seconds.
Last edited by TASHAN; 02-26-2006 at 07:19 AM.
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02-26-2006, 08:52 AM
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I guess Ill just replace it anyways. Ill bet thats what happened.
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