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Old 03-07-2011, 04:29 PM   #1
destroyeerr
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Question random misfiring after headers install..quick question

I installed my headers last night at a friends house, after everything was installed we started up the car and it ran fine for about a minute then it started misfiring.

I've read that i may have my front o2 sensors mixed up, but i was wondering if its also misfiring because i dont have an o2 sim installed yet.
also can i just switch the connectors up top to check if the o2 sensors are mixed up? or are the front o2 sensors different and i need to get down and switch their spots on the headers?

thanks, any help is greatly appreciated.
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Old 03-07-2011, 04:43 PM   #2
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why did you not mark the o2 sensors in the first place so you can avoid this common mistake>? This is brought up like every other day.

It will not misfire with o2 sims or without them, it will only throw a cat inefficiency code.
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Old 03-07-2011, 04:55 PM   #3
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You have a leak... check all your connections.

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Old 03-07-2011, 06:16 PM   #4
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I did mark them but and after the install its still misfiring, so I thought I had mixed them up.
I just switched them and it ran fine for about a minute then it started misfiring again.

ccagle, do you mean a vacuum leak? or an exhaust leak?

any other ideas anyone?
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Old 03-07-2011, 06:28 PM   #5
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Exhaust leak at the header and check your ground wires. I know is sounds odd but a loose ignition ground will cause it also


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Old 03-07-2011, 06:35 PM   #6
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alright ill check those right now..
these are the codes: p1343 misfire cyclider 1 w/ fuel cut off
p1345 misfire clinder 2 w/ fuel cut off
p1347 misfire cylinder 3 w/ fuel cut off
p0172 system too rich bank 1
p0175 system too rich bank 2
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Old 03-07-2011, 06:45 PM   #7
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i just used seafoam to see if i had an leak..and there is a small leak on the header gaskets.
my question now is if that leak could cause multiple cylinder misfires or not...the leak was not very big at all, only a little bit of smoke came off the gaskets
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Old 03-07-2011, 07:09 PM   #8
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some more info: everytime i start the car it runs perfectly fine, after about a minute of driving it starts to misfire
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Old 03-07-2011, 07:17 PM   #9
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I wouldn't think it would cause a misfire on all of them but at least the one at the leak point. There's one down. Now check your ignition grounds and your fuel pump ground. I'm leaning toward a low fuel issue? Upon start up, you have an excess amount of fuel (or just the right amount in your case). It will lean out shortly after start-up. Sounds like too lean on your end. Again, I'm no expert but know enough to make a few educated guesses.. good luck and I'll help when I can.

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Old 03-07-2011, 07:28 PM   #10
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thanks, I only took one ground off and i just double checked to make sure its on there fine.
I just went over everything and double checked and made sure all the sensors and everything are in hooked up. Everything that I took off I've put back on properly, I just dont understand why its misfiring like this..
its fine one minute and then it starts to misfire. my front o2's are hooked up fine and everything.
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Old 03-07-2011, 07:33 PM   #11
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I'd have your SES cleared and see what codes come up now. Go to autozone. They'll clear them in the parking lot. Wait a minute and see which ones pop back up. Oh and fix that header leak.....

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Old 03-07-2011, 07:58 PM   #12
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i did that..system too rich comes back up.
unless i completely screwed up my o2 sensors i don't see how this could be.
I'm going to try to switch my o2 sensors again in the morning just in case i screwed up twice.
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Old 03-07-2011, 08:54 PM   #13
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Since you say you have a small leak, that WILL cause all misfires. Redo the gaskets on the headers.
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Old 03-07-2011, 09:18 PM   #14
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I will redo it tomorrow and ill post back.
thanks, I really hope thats fixes it
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Old 03-08-2011, 04:46 PM   #15
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i redid the gaskets today and still misfiring..i also pulled out all my coils and plugs and checked to make sure they're fine and they are..

any other ideas before i have to take it to a shop guys?
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Old 03-08-2011, 05:36 PM   #16
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bumpp anyone?
i erased the codes and same ones came back:

p1343 misfire cyclider 1 w/ fuel cut off
p1345 misfire clinder 2 w/ fuel cut off
p1347 misfire cylinder 3 w/ fuel cut off
p0172 system too rich bank 1
p0175 system too rich bank 2
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Old 03-08-2011, 06:59 PM   #17
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Make sure you hooked up your O2 sensors correctly!

They have to go into the same connector!

Also check the big ground wire on the passenger side motor mount.
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Old 03-08-2011, 07:00 PM   #18
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But no matter what your going to get some SES codes since your not running cats, but no the fuel cut off code
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Old 03-08-2011, 07:14 PM   #19
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i double checked them, i even switched them to see if they fixed the problem and they didn't so i switched them back.

it runs fine for a minute or two after start up and then starts misfiring again...
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Old 03-08-2011, 07:40 PM   #20
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what kind of headers are they? bimmer brakes?

this isn't good-i was about to have mine installed!
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