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Old 09-25-2004, 03:19 PM
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popping exaust

my friends pickup has a terrible habit of popping when he lets off the throttle on both deacceleration and between shifts.

I thought it was a tuning problem and wasnt sure. The pickup is a 1993 dodge with a EFI 318. But the problem was more aparent after we hacked his exaust off behind the Cat to build a dual exaust and we wanted to find out if it was a backpressure problem before building the exaust.

so is it tuning or backpressure?

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Old 09-25-2004, 08:36 PM
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backpressure

well if you have it timed good i would have to say its backpressure i did the same to my camaro cut the exuast and it poped back hope this helps bye
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Old 09-25-2004, 09:47 PM
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Exhaust leak or idle fuel mixture. Sometimes it happens with certian cam and arb combonation. It's probably in the carb or an vacuum leak.
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Old 09-26-2004, 07:25 AM
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Quote:
Originally posted by johnsongrass1
Exhaust leak or idle fuel mixture. Sometimes it happens with certian cam and arb combonation. It's probably in the carb or an vacuum leak.
I'd love to see the carb on that engine

I would say it has to do with your exhaust chop job. EFI engines dont typically have the same problems as carb engines when it comes to timing and fuel tuning.
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Old 09-26-2004, 07:34 AM
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Right TurboS10, I would love to see that carb too! Oh well, I guess we are all guilty of not paying attention at one time or another.

I agree with you on the exhaust hack, it is most likely the culprit.

Have you checked for trouble codes? If a sensor is causing a rich condition, that could do it too.
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Old 09-26-2004, 08:33 AM
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Old 09-27-2004, 02:55 PM
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UPDATE

Checked the codes today and it showed the exhaust to move between lean and rich conditions just as it should. and apparently the timing is controlled by the computer anyways...

But the truck had always popped even with the stock muffler so should i clear the codes or try something else, maybe O2 sensor?
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Old 09-27-2004, 04:44 PM
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How many miles are on it?
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Old 09-28-2004, 02:43 AM
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i thought the exhaust always made a popping noise after modifying. my iroc-went with flowmaster-decel it would pop kind of like a jake brake(somewhat). el camino- put on dual flows- same thing pops like a jake brake
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Old 09-28-2004, 09:43 AM
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There was a problem with the PCM," powertrain control module"on 94's causing the popping in the exhaust?
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Old 09-28-2004, 02:35 PM
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not sure on the mileage and i havent heard about about the PCM problem but maybe theirs nothing to this problem anyways.

not sure on the mileage i think just over 100000 and i havent heard about about the PCM problem but maybe theirs nothing to this problem anyways.
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Old 09-28-2004, 02:37 PM
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Quote:
Originally posted by 5.0Falcon
not sure on the mileage and i havent heard about about the PCM problem but maybe theirs nothing to this problem anyways.

not sure on the mileage i think just over 100000 and i havent heard about about the PCM problem but maybe theirs nothing to this problem anyways.
I was thinking possibly a loose timing chain issue. You said it did this before you hacked the exhaust...right?
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Old 09-28-2004, 03:25 PM
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I don't think this is a problem at all. havent you guys ever trany-braked in something with loud exhaust. They snap and pop like crazy. Ive got a 98 GMC 350 vortec manual with true cat back duels and if you tranny brake it it sounds like a shot gun going off somtimes.
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Old 09-28-2004, 03:52 PM
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Quote:
Originally posted by 5.0Falcon
UPDATE


But the truck had always popped even with the stock muffler so should i clear the codes or try something else, maybe O2 sensor?
NovaSS350, he's saying the popping was there even with stock exhaust.
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Old 09-28-2004, 05:51 PM
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Exhaust leak.
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