Somebody help me figure out WTF is wrong with my car.
10-02-2005, 06:57 PM
#1
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Somebody help me figure out WTF is wrong with my car. I just put a converter in it this weekend, I removed the AIR, and put hooker shorty headers on. I took it out for a short test drive and it started running like crap. I autotapped it and it said I was getting missfires on #6 and code P0140 (rear o2 sensor). I came home and took off the plug wire didn't see anything wrong so I put it back and started it again. The missfires on #6 were still there, but they were down to about 10 counts from 60. The o2 mv for bank one cycled from about 175-545 and bank two 65-855.
The car is a 1998 TA mods on it are:
hooker shorty headers and catback
yank py3000
FIPK
TR55's and MSD wires.
Anyone out there have an idea what might be wrong??
The car is a 1998 TA mods on it are:
hooker shorty headers and catback
yank py3000
FIPK
TR55's and MSD wires.
Anyone out there have an idea what might be wrong??
10-02-2005, 10:03 PM
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I'm sure the wires are on right and I've got some of those heat resistant sleeves over the ones that are close to the headers. I do have an exhaust leak where the Y pipe connects to the catback.
10-02-2005, 10:31 PM
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I doubt the exhaust leak at the end of the Y pipe is doing it myself because back when I had longtubes on the car I had a worse exhaust leak for about 2 weeks and I didn't have any trouble. I don't think I messed up any plugs, but I've got some TR6's for it I think I'm gonna stick them in tommorrow. The weird thing is when I took the plug wire off #6 and put it back on the misfire went away for a while and #4 was misfiring a little. The last time I monitored it #6 was misfiring about 4 times a cycle and #4 about 2.
10-03-2005, 02:08 PM
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Ok it turns out #4 and #6 had cracked plugs, but here's the messed up part...it's STILL doing it. I let it idle for about 5 minutes and it was fine until i started backing it out of the garage, and it started again. I'm gonna go a switch the wires and see if maybe that's the cause.
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10-03-2005, 03:10 PM
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Ok, it seems the missfire is only at idle. I just took it down the road and back for about 5 minutes and the missfires went away (trying to drive and watch the laptop is a bitch) I did notice a little bit of surging. When I stopped and let it idle I got a couple counts of missfire here and there but nothing like before. Could it be the computer recalibrating for the shorty headers and stock Y pipe, before I had longtubes and no cats.
10-03-2005, 08:05 PM
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When I had misfire on #6 and tried everything else plugs, wires, coilpacks, injectors, I mean everything, I had ended up burning the wires that come off the o2 sensors. Try that.
10-03-2005, 10:14 PM
#12
Originally Posted by BAT TA
Ok, it seems the missfire is only at idle. I just took it down the road and back for about 5 minutes and the missfires went away (trying to drive and watch the laptop is a bitch) I did notice a little bit of surging. When I stopped and let it idle I got a couple counts of missfire here and there but nothing like before. Could it be the computer recalibrating for the shorty headers and stock Y pipe, before I had longtubes and no cats.
ah, good to hear it is working out for you. keep us updated! you plan on getting a full tune soon?
10-03-2005, 10:44 PM
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Other than a couple slight misses at idle that i wouldn't notice unless i had autotap it works fine. I'm gonna have to bump up the line pressure a little i think, but other than that i'm going to leave it until I get my turbo kit on and get it tuned. I do have hp tuners though, could I tune it myself? I'm not sure what I'd have to mess with to take care of a missfire.
10-03-2005, 11:46 PM
#14
If it's not causing you a problem I would leave it alone. Mine was ok until I put a pretty big cam in it. After the cam went in the verter would only lock about 1/3 of the time. There are 2 ways to deal with it, one is to turn off the missfire detection, which is what I had done. I'm not sure on the other method, but it is described in one of the sticky's in the PCM section. Some missfires at idle are normal with a bigger stall. 
