Car Back firing?
Thread Starter
Teching In
Joined: Dec 2010
Posts: 40
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From: MO
Car Back firing? Having a back firing issue with the car once it gets a load on it off the line. Took it to the track and ran off the trans brake and it back fires and the car dies. But if I roll into it off the line it seems to not back fire. Only happens when we put load on it. Not sure if i got a voltage or wiring issue. Ive looked at all my sensors and they r in good shape. My battery is new along and my alternator is reading high. Last time we were out the voltage on my battery was reading 13 volts. Any help would be greatly appreciated.
Thanks,
Thanks,
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Joined: Jan 2008
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From: Ohio, Georgia, Nevada, Texas
What is your air fuel ratio at idle, while under load and normal driving? If you do not have a wideband installed we do recommend installing getting a quality Wideband Gauge installed to help diagnose this problem and for general tuning ease. You can also take spark plug readings, note exhaust smoke color to help determine if the engine is rich or lean.
Thread Starter
Teching In
Joined: Dec 2010
Posts: 40
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From: MO
My air fuel is running right about 11 or and stays constant going down the track. Its got a wideband on the it. Im thinking its gotta be something with the wiring. Just put in a 10pt and might of nipped a ground wire or something. Pulled all the spark plugs and they all look good.
LS1Tech Sponsor
Joined: Jan 2008
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From: Ohio, Georgia, Nevada, Texas
Your set up was fine before installing a cage? If that is the case check any areas in the car you cut, drilled, welded or installed hardware to check for melted or damaged wiring. This is tedious work but sometimes the only way to diagnose a problem that shows up after a installation like this. Did you disconnect the battery before welding?
Thread Starter
Teching In
Joined: Dec 2010
Posts: 40
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From: MO
Yeah we are gonna check all the wiring tonight and see if something got burnt or cut during the cage. I wasnt there when the cage was installed so not sure if the battery was disconnected or not. Would that make a difference?
Thanks,
Thanks,
LS1Tech Sponsor
Joined: Jan 2008
Posts: 2,238
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From: Ohio, Georgia, Nevada, Texas
With electronics it is always to remove them from the electrical system when doing any type of welding. There is a chance of damage caused from the welder’s high current. This normally leads to a complete failure and not intermittent situation so we are leaning more towards a damaged wire/ sensor.
