Car back fires while Entering boost
Car back fires while Entering boost Well after I fixed the miss everything is ok now other than it backfireing a little as I get on it, I am taking it back to who tuned it next week to look into the tune. I only drove it once untill it started backfireing incase it is running lean or something. Any ideas what may be causeing it? All plugs gapped at .30. O yea I have a rear mount turbo
Last edited by Eatinstang4life; May 13, 2007 at 06:34 PM.
Well I had it tuned a week ago and it was missing on the dyno so I took it home but new wires and checked the plugs and I found the wires were coming out of the 02 plug so I fixed them now it doesnt miss at all, and I tried getting on it and it backfired a lot
yes, and you need to get a w/b just so you will know your a/f, that way if it was running too lean or rich you could at least go from there. have the tuner look at it again..
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OK the WB02 question was already asked, but are you scanning the car with HPT or EFIlive to get a good view of whats going on in realtime?
Can be too rich or too lean, too much timing etc....
I feel it is essential to have a tuning suite (HPT, EFIlive) when going force inducted as its too easy to blow stuff up if the tune is out of whack.
If you have HPT/EFIlive, then post up a log of whats going on, that'll help get you pointed in the right direction.
Any codes being thrown?
Can be too rich or too lean, too much timing etc....
I feel it is essential to have a tuning suite (HPT, EFIlive) when going force inducted as its too easy to blow stuff up if the tune is out of whack.
If you have HPT/EFIlive, then post up a log of whats going on, that'll help get you pointed in the right direction.
Any codes being thrown?
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Is your car tuned with a 2 bar setup? Could it be that the car is getting too much fuel just as you get into boost (assuming you don't have the 2 bar setup), and then as the boost gets to your final setting your getting the right fuel??? Just a thought.
Which plugs are you running? Might want to try and tighten your plug gap too. Ive seen where the plug was not cold enough and once a colder plug was used, this prob completely went away. You can try a gap of anywhere from 25 to 35 thou
And of course as every1 is stating, you desperately need to check your AFR. Pay attention to AFR, the correct plug config, and WOT timing. You may just need to reduce timing as boost comes on. If your timing is too high at peak boost/peak tq, then it may be retarding a lot.
And of course as every1 is stating, you desperately need to check your AFR. Pay attention to AFR, the correct plug config, and WOT timing. You may just need to reduce timing as boost comes on. If your timing is too high at peak boost/peak tq, then it may be retarding a lot.
Well let me describe everything a little better. I have the plugs gapped about 30. Last week I was getting it tuned, noticed a miss and a stutter check ingine light blinking and service engine light was on .So took the car home checked everything out one plug gap was completely shut prob cause I dropped it while installing it and forgot to recheck the gap. I then replaced the wires, I also noticed my o2 sensor wires were messed up so fixed them. Took the car out no more miss but engine lights still on then one day it backfired and the lights whent out, now its just backfireing, I am taking it back to tuner today, I'm guessing that when I got it tuned befoe it may have only been running on 7 cylinders, so now maybe I am running lean. But I am getting the tune touched up today.
Originally Posted by Pro Stock John
Backfires thru the intake or thru the exhaust? Probably too rich, fouled plugs, or have an ignition problem.
I'd first make sure that your 02's are set up right, if they are not working the car will default rich. I'd check them since you said they were 'messed up.'
I'd also recheck plugs.
Then I'd log a/f and see what it's doing.
I'd also recheck plugs.
Then I'd log a/f and see what it's doing.
Do you have any way to look at scan the car, maybe the 02's are broken, if they are the values at idle won't do anything. If they are fine, they will switch back and forth.