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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / December 200688 chevy 454 backfire
I am at a loss with this one. I replaced the intake and exhaust gaskets in my 88 454. She was chugging and had visible and audible exhaust leaks. The engine runs great now at idle and timing is steady at 4 deg BTDC. New plugs, wires and distributor cap. Manifolds were torqued to specifications and to my knowledge I put everything back by the book. I now have a backfire through the TBI from 25 to 45 MPH usually under load. (9K suburban is a load at level). The backfire will stop and I get full power without hesitation if I floor it. I replaced the coil and have triple checked everything. I am getting ready to dump $95 on a distributor as the electronic advance looks funky to me. Anyone else have any other suggestions? recheck your > I am at a loss with this one. I replaced the intake and exhaust gaskets > in my 88 454. She was chugging and had visible and audible exhaust [quoted text clipped - 7 lines] > distributor as the electronic advance looks funky to me. Anyone else > have any other suggestions? recheck your wire order. Also make sure your #1 is truely at #1 on the distributor and not 1 off all the way around. just a suggestion. its gotten me a time or two > I am at a loss with this one. I replaced the intake and exhaust gaskets > in my 88 454. She was chugging and had visible and audible exhaust [quoted text clipped - 7 lines] > distributor as the electronic advance looks funky to me. Anyone else > have any other suggestions? > recheck your wire order. Also make sure your #1 is truely at #1 on the > distributor and not 1 off all the way around. > > just a suggestion. its gotten me a time or two Those distributors can be turned far enough to make the wiring order look correct but still be off by 1 all the way around. Ted Problem solved! Thanks for all the advise. ED and scores of my friends were all hitting on sound ideas but in the end it was my failure to take the instructions in the book seriousely. Haynes Repair Manual says to disconnect the Electronic Spark Timing prior to adjusting the ignition timing and they mean it! Once I located it behind my glove box it centered right in and runs like a champ. I now have hundreds of dollars in new parts and am a little bit wiser! > recheck your wire order. Also make sure your #1 is truely at #1 on the > distributor and not 1 off all the way around. [quoted text clipped - 12 lines] > > distributor as the electronic advance looks funky to me. Anyone else > > have any other suggestions? > I am at a loss with this one. I replaced the intake and exhaust gaskets > in my 88 454. She was chugging and had visible and audible exhaust [quoted text clipped - 7 lines] > distributor as the electronic advance looks funky to me. Anyone else > have any other suggestions? Pull the dist cap and give the rotor a side to side "wiggle". Any slop is bad and pretty common on high mile distributors. Is sloppy a rebuild or replacement is in order. > I am at a loss with this one. I replaced the intake and exhaust gaskets > in my 88 454. She was chugging and had visible and audible exhaust [quoted text clipped - 7 lines] > distributor as the electronic advance looks funky to me. Anyone else > have any other suggestions? |
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