car is backfiring after header install
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TECH Enthusiast
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From: West TN/KY border
car is backfiring after header install ok so i just installed off road headers and y-pipe, as well as an egr delete. then i sent the pcm to madtuner to be tuned, becuase it was back firing and i heard that deleting the egr will do that. well i got it back today and it is still back firing, what could be wrong with it?
its a 93 lt1 btw
its a 93 lt1 btw
Launching!
Joined: Mar 2009
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From: Sacramento
check your spark pluggs see if u cracked one or so..alos check your wires might have burned one..make sure your o2 sensionrs r properly working also..if non of that your opti might be on its way to the trash..
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Thread Starter
TECH Enthusiast
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From: West TN/KY border
ok so it mostly does it at idle, or in drive, and it feels like its running pretty rough, so im thinkin maybe i have a miss, so its probably a plug or wire right?
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Joined: Oct 2007
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Most likely a wire. If the headers are pacesetter headers look to cylinder number 5. The 3rd one back on the driver side. The boot will be very close to the pipe. You have to pull the wires off and closely inspect them, you can't just peek under the hood. Sometimes a small crack in a wire will be very hard to see unless you bend the wire. Any crack will allow the spark to jump and that cylinder not to fire.
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Joined: Feb 2005
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From: Valdosta Ga.
I hate the look of otvc wires, it just looks redneck. I did mine as close to stock as i could. and it worked perfectly, i did have my engine out and did it with the headers off, then pulled the wires off the plugs, put the headers on, and popped them back on the plugs. also, make sure you have all the plug wires going to the right plugs, its a very common mistake to cross them up.
