Backfire,now have a miss
#65281
05/28/08 06:06 PM
05/28/08 06:06 PM
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Joined: Jan 2003
Posts: 2,048
N.E.Ohio
Polarabill
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 2,048
N.E.Ohio
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Recently when I started my 64 dodge with a 73 440 in it, it backfired thru the carb.Since then it has developed a miss through out the RPM range.The harder you hit the gas the worse the miss. Most of the miss can be adjusted out with the distributor but then the car won't start.Could it have jumped a tooth or two on the timing gear? What else can cause these symptoms? Thanks for any information offered.
This would be so much easier if I knew what I was doing...
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Re: Backfire,now have a miss
[Re: 68CoronetRT]
#65283
05/28/08 06:24 PM
05/28/08 06:24 PM
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Joined: Jan 2003
Posts: 2,048
N.E.Ohio
Polarabill
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 2,048
N.E.Ohio
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No Holley, 750 Edlebrock.
This would be so much easier if I knew what I was doing...
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Re: Backfire,now have a miss
[Re: Polarabill]
#65284
05/28/08 06:29 PM
05/28/08 06:29 PM
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Joined: Feb 2008
Posts: 992
Simi Valley, CA
MoparJ
super stock
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super stock
Joined: Feb 2008
Posts: 992
Simi Valley, CA
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I would say that it is possibly the power valve if it is an older Holley, but I am not sure about that.
It sounds like timing, almost as if it jumped a tooth or shredded a tooth off of the timimg gear. Is is a stock chain and nylon gear?
Although, if it were the chain, I would expect a bit of backfiring as well.
-Justin
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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Re: Backfire,now have a miss
[Re: stwheels]
#65286
05/28/08 06:40 PM
05/28/08 06:40 PM
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Joined: Jan 2003
Posts: 2,048
N.E.Ohio
Polarabill
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 2,048
N.E.Ohio
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Thanks for the tips so far.
This would be so much easier if I knew what I was doing...
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Re: Backfire,now have a miss
[Re: Polarabill]
#65288
05/29/08 07:17 AM
05/29/08 07:17 AM
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Joined: Oct 2003
Posts: 4,013
South Park, Pa.
68LAR
master
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master
Joined: Oct 2003
Posts: 4,013
South Park, Pa.
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Have you pulled the spark plugs yet? Does the engine have a ticking sound when running? If so it could be a bent push rod. If not, I doubt that a push rod is bent. 
Last edited by 68LAR; 05/29/08 07:22 AM.
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Re: Backfire,now have a miss
[Re: 68LAR]
#65289
05/29/08 07:38 AM
05/29/08 07:38 AM
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Joined: Dec 2006
Posts: 227
upstate NY 12839
TMBOOTS
enthusiast
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enthusiast
Joined: Dec 2006
Posts: 227
upstate NY 12839
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Quote:
Have you pulled the spark plugs yet?
Does the engine have a ticking sound when running? If so it could be a bent push rod. If not, I doubt that a push rod is bent.
I agree check the spark plugs and you may find a crack or chip due to the backfire or advanced ignition
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