Headers installed and car is mis-firing..backfiring..running like CRAP!!
07-01-2005, 12:07 PM
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Headers installed and car is mis-firing..backfiring..running like CRAP!! I just got my car and had headers and ory installed with O2 simms the whole nine yards and I was driving to work from the shop and my car is flashing the SES light..backfiring I mean even at idle and runnign really rough no power at ALL!!! WHat that hell is wrong with my car??!?!?!??!
07-01-2005, 12:12 PM
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Sounds like one of or both of the "front," or "Pre" Cat O2's are bad. Do you have any codes? Does it miss fire right off the bat? Or does it take a couple of minuets? I had a bad front O2 and as the emissions tests worked their way thru after start up the car would miss fire. Codes?
07-01-2005, 01:36 PM
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Originally Posted by iamsickofitall
check you spark plug wires to make sure they are all on tight
he triple checked them all...all in and on right..???
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07-01-2005, 02:36 PM
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Originally Posted by 01black
The installer put his scanner on it and could find NOTHING wrong at all...???
if all the bolts are tight on all the header/block connections, and the band clamps connections for the headers to the y-pipe and the exhaust, and all the spark plugs and plug wires are good, then you need to be looking at the o2 sensors. if you don't have cats then you need to tune out the rear sensors or have rear o2 deletes.
07-01-2005, 07:04 PM
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Originally Posted by technical
Any chance you burned a spark plug wire on the header?
I'm running accel 9000 wires just for that reason...I looked at every single wire and felt all around them for some kind of burn mark but there was nothing..I mean from the time I started it and rolled outta the drive way it's been doing it...i have no idea why this would occur, oh well back to the shop on tuesday...
07-01-2005, 07:06 PM
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Originally Posted by technical
Any chance you burned a spark plug wire on the header?
I'm running accel 9000 wires just for that reason...I looked at every single wire and felt all around them for some kind of burn mark but there was nothing..I mean from the time I started it and rolled outta the drive way it's been doing it...i have no idea why this would occur but oh well till tuesday....going back to see what happens, I'll post again.
07-02-2005, 08:47 PM
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Naw, the wires have been on since sept of 04...i need to get it on atap see what and why it's mis-firing, I aint driving it till it goes back on tues. Just hope it doenst cost me an arm and a leg
07-02-2005, 08:52 PM
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Originally Posted by Doc
Sounds like one of or both of the "front," or "Pre" Cat O2's are bad. Do you have any codes? Does it miss fire right off the bat? Or does it take a couple of minuets? I had a bad front O2 and as the emissions tests worked their way thru after start up the car would miss fire. Codes?
07-02-2005, 09:09 PM
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I can't see how O2s could cause this. After I had my headers installed a few years ago, my O2 simms didn't work and set off codes but the car still ran fine until I got a new set. Also, my front O2s were out for several months up til a few days ago and my car still ran fine. My car wasn't tuned either when the headers went on. It wasn't until a year later before it was tuned.
Are all the coil packs hooked up and in the right spot and all connections are tight? I would think the problem would come from the coil packs/sparkplugs/wires before O2s
Are all the coil packs hooked up and in the right spot and all connections are tight? I would think the problem would come from the coil packs/sparkplugs/wires before O2s
07-02-2005, 09:17 PM
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Listen I garuntee this is you problem 99% sure. Same thing happened to me twice.
You probably burnt or freyed the o2 wires after the install. I had the same problem. If you ever get a flashing ses light then that means misfires. If you have checked everything else that causes a misfire than this is your problem.
You probably burnt or freyed the o2 wires after the install. I had the same problem. If you ever get a flashing ses light then that means misfires. If you have checked everything else that causes a misfire than this is your problem.
07-02-2005, 09:27 PM
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i'm sure you could be right, i guess my car just acts different. Last set of O2's I installed, the header burnt through on the left side and it still never missfired. I took both out today and ran the car with both O2s out just to clear out any silicone residue or anything and it still ran fine.
07-02-2005, 09:36 PM
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Originally Posted by jimmypop13
i'm sure you could be right, i guess my car just acts different. Last set of O2's I installed, the header burnt through on the left side and it still never missfired. I took both out today and ran the car with both O2s out just to clear out any silicone residue or anything and it still ran fine.
If the main purple wire gets burnt, freyed etc... this will happen. It took me along time to find the problem. See after I installed my A/F gages(1for each bank) using a pigtail that splices in between the wire harness and o2 sensor and gives you the main purple wire to hook to I started having the same problem he is. I went through everything that would cause a misfire plugs,wires,injectors,coilpacks everything wasted a lot of money. The second time it happened I new right where to go.
Moral of the story kids, keep those wires tucked away from heat and from rubbing against metal.
Last edited by Tranzaman00; 07-02-2005 at 10:52 PM.