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  #1  
Old 09-15-2013, 02:53 PM
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Default Back Firing

What causes a motor to back fire really bad when you let off the throttle?
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Old 09-16-2013, 01:34 AM
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Check this out.
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Old 09-17-2013, 03:47 PM
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In my experience, it's not burning fuel correctly. It could be due to a faulty IAC valve ($40-$45). The IAC is the Idle Air Control valve and regulates the air input into the engine through the throttle body. Have you noticed any excess amount of black smoke? It could also be a faulty 02 sensor and the engine is not compensating for a rich mixture. I'd try the IAC first. Is there a low idle at times? A sucking noise as if there's a vacuum leak?

Last edited by Warlock III; 09-17-2013 at 03:50 PM.
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Old 09-18-2013, 09:48 PM
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I kinda figured it would be a mix issue. There isnt black smoke, it will sometimes idle really slow, like drop from 1100-1000rpms to like 500rpm. Do you know which o2 would be the one to check, upper or lower or both?
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Old 09-18-2013, 10:32 PM
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upstream before the cat. Don't get a cheap one. If you buy a cheap one and then a good one since the cheap one was crap then you still wasted money on the cheap one and had to do it twice.
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Old 09-19-2013, 12:48 AM
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do you think Denso or bosch?
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Old 09-19-2013, 11:21 AM
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Hmmm...that's a good question. I used a Denso and it lasted about a year. CEL comes on every now and then now. Never tried a Bosch but I like most of their products. Let's give it a day and see if RRJ, G1D, or one of the other guys can shed some light on it.

Try just unplugging the upstream 02 (Bank 1 sensor 1). See if it runs without backfiring. You'll get a CEL (21) but the ECM won't be trying to compensate for a bad signal. Keep us updated and post the results. It is an easy way to earn some reps and helps other members when they have a problem and use the search option.

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Last edited by Warlock III; 09-19-2013 at 11:38 AM.
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Old 09-19-2013, 11:27 PM
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Bosch, without a doubt. As far as O2 sensors go, they paved the way for all the others. And get the OEM one, not the universal one. Like Warlock has said, if your gonna do it, do it right the first time so you don't have to do it again.

Definitely keep us posted.
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Old 09-20-2013, 12:05 AM
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Quote:
Originally Posted by cdetterer View Post
I kinda figured it would be a mix issue. There isnt black smoke, it will sometimes idle really slow, like drop from 1100-1000rpms to like 500rpm. Do you know which o2 would be the one to check, upper or lower or both?
wait, Time out. not meaning to hijack, but you idle at 1100 rmp and it drops?

Mine idles at the same and WONT drop, I was told i have a high idle and we've spent almost 2k trying to fix it to get it TO DROP to 600ish..
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Old 09-20-2013, 11:45 AM
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Quote:
Originally Posted by Thebestestdrummer View Post
wait, Time out. not meaning to hijack, but you idle at 1100 rmp and it drops?

Mine idles at the same and WONT drop, I was told i have a high idle and we've spent almost 2k trying to fix it to get it TO DROP to 600ish..
I was at about 1000-1050 Rpm, and when I changed the 02 sensor it dropped to a relatively comfortable 550=600. I changed the IAC because it was too low, and it ran much better, but the idle was around 1000. Then with the 02 sensor it dropped back into an acceptable range.

Just for the heck of it, Mine's a MT, so the issue was different with the ability to use the clutch.
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