Car missing out under load.
#792956
09/04/10 11:11 PM
09/04/10 11:11 PM
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Joined: Oct 2005
Posts: 90 Central, Indiana
mc4406
OP
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OP
member
Joined: Oct 2005
Posts: 90
Central, Indiana
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I'll try and keep this question short. Driving Car the other day(440-6 Superbee) and it started backfiring and mising out over 2500 rpm. pulled over changed out ballist resistor and everything seemed fine, drove another 30 miles no prob then on way back home bam!! started doing again, I just swapped old dist(dual points) out with Mopar Elect and fires right up revs into 4000 rpm range no problem idles fine,etc. went out for drive and under acceleration starts missing out and backfiring, let off and runs fine?? I've replaced the coil also with new accel superstock unit, new dist,cap,rotor,and ballist. so i'm kinda at a loss, Before the other day car has been driven alot with no problems.
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Re: Car missing out under load.
[Re: mc4406]
#792957
09/04/10 11:19 PM
09/04/10 11:19 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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plug or plug wire missing under load? EDIT What ECU?
Last edited by RapidRobert; 09/04/10 11:23 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Car missing out under load.
[Re: mc4406]
#792959
09/04/10 11:37 PM
09/04/10 11:37 PM
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Joined: Jan 2006
Posts: 3,535 Canuckville
68Cbarge
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master
Joined: Jan 2006
Posts: 3,535
Canuckville
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Loose or fouled up spark plug,or loose plug wire. A 6bbl car? HHmmm maybe the carbs need adjusting?? A vacuum pod stuck open/opening too soon on the outboard carbs and dumping fuel into the engine??
'68 Newport Custom Barge on a Budget!! BOAB 1973 Satellite WAGON! 318- 3 on the tree!! 2008 Chrysler 300c HEMI!
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Re: Car missing out under load.
[Re: mc4406]
#792961
09/05/10 07:01 PM
09/05/10 07:01 PM
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Joined: Jan 2006
Posts: 3,535 Canuckville
68Cbarge
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master
Joined: Jan 2006
Posts: 3,535
Canuckville
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4000 RPM and no load is totally different compared to 4000 RPM under a load,IMHO. The vacuum rating is different under those situations and the outer carbs rely on vacuum to operate when the engine is under a load..
'68 Newport Custom Barge on a Budget!! BOAB 1973 Satellite WAGON! 318- 3 on the tree!! 2008 Chrysler 300c HEMI!
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Re: Car missing out under load.
[Re: mc4406]
#792963
09/05/10 10:23 PM
09/05/10 10:23 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I feel bad all that changing out & no fix (as of yet). I wonder if the intake bathtub gasket has developed a slight leak on the bottom side. Might richen the pri jets WAY up just for a test & see if that affects it & do you have another ECU in your stash that you could sub in for a day. That way no parts outlay just more time on it.
live every 24 hour block of time like it's your last day on earth
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Re: Car missing out under load.
[Re: RapidRobert]
#792968
09/05/10 11:09 PM
09/05/10 11:09 PM
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Joined: Jan 2006
Posts: 3,535 Canuckville
68Cbarge
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master
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Canuckville
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I am leaning towards the intake gasket.
'68 Newport Custom Barge on a Budget!! BOAB 1973 Satellite WAGON! 318- 3 on the tree!! 2008 Chrysler 300c HEMI!
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