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Old 03-18-2012, 08:28 PM   #1
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Backfire

I was on a cruise with my friends and after a did a nice run and let off of the gas the car backfired. Is there something wrong with my air/fuel or is my timing off? Is this bad and how can this be fixed if it is. Usually I will get a little bit of popping in the exhaust but this was the first full out backfire.
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Old 03-19-2012, 01:39 PM   #2
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Re: Backfire

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Originally Posted by 89Saleen141 View Post
I was on a cruise with my friends and after a did a nice run and let off of the gas the car backfired. Is there something wrong with my air/fuel or is my timing off? Is this bad and how can this be fixed if it is. Usually I will get a little bit of popping in the exhaust but this was the first full out backfire.
Sounds like a possible fueling and/or timing issue.
Check your fuel pressure at idle with the vacuum line removed and plugged.
Check your timing and if you need to reset it don't forget to remove the spout connector first and replace it when you are done.


Popping in the exhaust could be from an exhaust system leak.
If it is before the O2 sensors it could also be the cause of fuel/air mix problems.
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Old 03-19-2012, 07:04 PM   #3
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Re: Backfire

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Originally Posted by Trojan Horse View Post
Sounds like a possible fueling and/or timing issue.
Check your fuel pressure at idle with the vacuum line removed and plugged.
Check your timing and if you need to reset it don't forget to remove the spout connector first and replace it when you are done.


Popping in the exhaust could be from an exhaust system leak.
If it is before the O2 sensors it could also be the cause of fuel/air mix problems.
Alrite, it looks as if now would be a decent time to install some new fuel rails and fuel pressure regulator with gauge.
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Old 03-19-2012, 07:10 PM   #4
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its nice to have a new gauge anyways.i put one on my fuel line also.but if you are just curious and not ready to do all that you can just hook up a gauge to the pitcock valve.you can rent a gauge from autozone if you want.

also if you want to be fancy you can get an electric gauge and mount it in the car so you can see it at all times. just a copke ideas for ya.
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Old 03-19-2012, 07:37 PM   #5
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I had (very rarely) a few backfires when I first removed my cats and still had my air pump hooked up..when I bypassed it it went away for good,but I also advanced my timing to 14° when I bypassed the air pump!...
Ps..my timing was at 10° btdc prior..
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