283 sputters at both ends - Impala Tech
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post #1 of 6 (permalink) Old 06-17-2007, 08:03 PM Thread Starter
 
 
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283 sputters at both ends

Hi everyone.
I hope to get some help here. 64 resto is complete with rebuilt 283, mild cam, edelbrock performer and carb, MSD HEI, fuel pressure reg etc. I got my engine running strong at first, drove it about a month, no sputtering or hesitation, always started. It seems to be going down hill after new exhaust pipes were installed on my hugger headers. Runs a little rough, used a timing light and tried 0-4,6,8, degree advances, rich and lean settings, vacuum leak checks, wires, plugs etc. It stumbles or pops upon slow accelleration, tends to run 200 deg now, when turned off it pops out the rear when in park but not when in drive, at 60+ mph it hesitates, backfire through carb, actually had a loss of power in all ranges now. I don't know if it's carb, HEI or what do you guys think?
Thanks,
JimV
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post #2 of 6 (permalink) Old 06-18-2007, 11:30 AM
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I would say it is a vacuum problem, maybe it is in the distributor vacuum advance or something in that area. I had the same problem it was a vacuum leak between the carb and intake.



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1964 Impala 2 Dr HT 4 sp posi
1969 Camaro before and during http://rides.webshots.com/album/546302474IrnbEH

1969 Camaro almost done http://rides.webshots.com/album/553646077CLCZBu

1969 ElCamino SS http://rides.webshots.com/album/546349285mMtINq
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post #3 of 6 (permalink) Old 06-18-2007, 05:50 PM Thread Starter
 
 
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I will check that as a possible cause and get back. Thanks.
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post #4 of 6 (permalink) Old 06-19-2007, 05:23 AM Thread Starter
 
 
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283 sputters at both ends

Hi.
I removed carb, re-sealed all possible areas. Still does it I've read other info that the HEI internal type coil has problems. These symtoms remind me of when an old oil filled coiled would crack and do the same. I would contact MSD but like any manufacturer they'll never admit to any problems with it. Does anyone have experienece like this with their HEI unit? Thanks, jimv
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post #5 of 6 (permalink) Old 06-20-2007, 05:45 AM Thread Starter
 
 
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283 sputters at both ends

OK, narrowed it down I think. While timing the engine I decided to place the plug wire pick-up on other wires. I watched the light steady on some wires and skipping several flashes on other wires. This indicates that there is not a steady voltage going to some of the plugs. This will cause fuel to ignite elswhere on hot surfaces either through the intake or out the exhaust header. I traced it to the MSD factory distributor connectors on the new MSD wires to be defective! I also was advised from another classic car owner that he had the same problem and switched plug wire brands to sove his problem. Lesson to be learned..name brands are not always the best to buy. It can be a costly and time consuming experience.
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post #6 of 6 (permalink) Old 06-20-2007, 10:44 AM
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I'm glad to hear you are getting it figured out. Sometimes small problems are the hardest things to detect.



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1964 Impala 2 Dr HT 4 sp posi
1969 Camaro before and during http://rides.webshots.com/album/546302474IrnbEH

1969 Camaro almost done http://rides.webshots.com/album/553646077CLCZBu

1969 ElCamino SS http://rides.webshots.com/album/546349285mMtINq
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