383 BACKFIRING THROUGH EXHAUST...HELP!!!
#1
383 BACKFIRING THROUGH EXHAUST...HELP!!!
I have a 1969 Dodge Super Bee with a warmed 383 4bbl with Chrysler electronic ignition. Recently when I start it at idle it will BANG through the exhaust every few seconds so bad I have to turn it off. I also noticed that with the ignition key on I can touch the battery cable to the battery and the coil clicks and makes a buzzing sound for a second or two. I've tried several new coils but I get the same thing. Firing order is correct and all parts are new (fresh build). It ran great before and no changes have been made since it ran good. What could cause it to BANG through the exhaust every few seconds? My brain hurts.
I would appreciate any help.
THANKS!
David T.
I would appreciate any help.
THANKS!
David T.
#6
Mopar Lover
Late ignition timing or open (stuck) exhaust valve. Compression test YES. Air pressure test with both valves closed on compression stroke through spark plug hole, as well. Only after checking ignition timing.
#7
Mopar Lover
D -
It's either timing, valve problem or crossed wires.
And don't rule out wire arcing, a slipped timing chain or a bad control box, but the latter is VERY rare.
Since it happens all the time, the cause has to be pretty basic.
Archer
It's either timing, valve problem or crossed wires.
And don't rule out wire arcing, a slipped timing chain or a bad control box, but the latter is VERY rare.
Since it happens all the time, the cause has to be pretty basic.
Archer
#8
Super Moderator
Bottom of distributor cap dry, I have seen condensation mess things up.
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Gorts 5th (02-05-2017)
#10
Mopar Lover
I have a 1969 Dodge Super Bee with a warmed 383 4bbl with Chrysler electronic ignition. Recently when I start it at idle it will BANG through the exhaust every few seconds so bad I have to turn it off. I also noticed that with the ignition key on I can touch the battery cable to the battery and the coil clicks and makes a buzzing sound for a second or two. I've tried several new coils but I get the same thing. Firing order is correct and all parts are new (fresh build). It ran great before and no changes have been made since it ran good. What could cause it to BANG through the exhaust every few seconds? My brain hurts.
I would appreciate any help.
THANKS!
David T.
I would appreciate any help.
THANKS!
David T.
Check the grounds especially the strap from the rear of the block th the body...
I jad a simular issue.
I think your coil is acting as a ground ....as the short searches for a ground it finds the coil and discharges causing it to missfire.
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