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Author Topic: backfiring problem  (Read 1803 times)

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Offline dcbchristian

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backfiring problem
« on: May 12, 2010, 10:42:20 AM »
when i get on the gas hard, my car backfires. any ideas why?
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Offline Fred Morgan

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Re: backfiring problem
« Reply #1 on: May 12, 2010, 11:15:11 AM »
Is engine warmed up ? is ecelerator pump working properly ? is ignition timming to far advanced ? are valves ok do compresion check.  Fred   :)
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Fred Morgan- Missing from us...
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Offline Pangra74

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Re: backfiring problem
« Reply #2 on: May 12, 2010, 10:55:30 PM »
Yeah, I agree with Fred. Mine used to pop back thru the carb....igniti on timing was the culprit

Joe
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Offline discolives78

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Re: backfiring problem
« Reply #3 on: May 25, 2010, 10:46:52 PM »
I had a burned #4 plug and it backfired on decel, not acceleration. It's fixed now, but it used to pop back thru the cat or sound like it was detonating in the cat sometimes. Getting straight piped soon since no emmissions laws in my area (yet :-\). I just took off the air pump and blocked the hole in the manifold with a 1/2" MIP (male iron pipe threads) from Home depot. car runs a lot better now. EGR is next to go!

Chuck :coolafro:
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A virtual version of my last Pinto. Was Registered Ride #111. Missed every day.

Offline dcbchristian

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Re: backfiring problem
« Reply #4 on: May 25, 2010, 11:57:00 PM »
Since mine is a 72, I don't have a cat. I'm not running egr or charcoal purge canister. Then the next step is a 351w :)
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Offline CHEAPRACER

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Re: backfiring problem
« Reply #5 on: May 26, 2010, 11:46:27 PM »
It takes a lot more spark energy to run an engine under a load. Something as simple as a break in a plug wire or retarded timing will cause a backfire under load. My advice would be to start with a complete ignition tuneup including new wires and make sure you set your timing.
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Offline dick1172762

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Re: backfiring problem
« Reply #6 on: May 27, 2010, 12:02:22 AM »
If its a 2.0L, check to see if the points are loose from the plate they mount to.
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