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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, May-18-2017, 09:28:55 PM   #1
SeanE46
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Default Post Header Install Misfire

Hey guys im having a really bad hesitiation/misfire after i installed the Manzo (Ebay) catless headers. I bought these off my friend for really cheap so i decided why not put them on (sold his M3).

But last week after the initial install it was barely driveable, so 2 coil pack,2 spark plugs, and a fuel filter later it still is misfiring/hesitating/bucking.

I asked the shop owner whats going on and hes saying after the tune it will be all back to normal. Im really confused cause ive read many people dont have to tune after they install catless headers?

I really dont know what to do? They checked fuel pressure and it was good. So what could possibly be causing it? Tune? Ignition?

Thanks and any suggestions would be great!
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Old Thu, May-18-2017, 09:39:21 PM   #2
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Default Re: Post Header Install Misfire

You will need a tune, and Id say it will fix things. Ive heard about many people's Ms running rich after going catless.


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Old Thu, May-18-2017, 09:39:28 PM   #3
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Default Re: Post Header Install Misfire

This is really common when the o2 sensors are incorrectly re-installed.
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Old Thu, May-18-2017, 09:39:40 PM   #4
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Default Re: Post Header Install Misfire

Maybe the 02s were damaged or put back on in the wrong place.

It most likely not tune related
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Old Thu, May-18-2017, 09:57:00 PM   #5
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Default Re: Post Header Install Misfire

Damn quick replies!! Shortly after making the thread I cleared all DME codes and adaptations and went for a 1-2 min drive.
When I got back the cel light was on again and I got Bank 1 & 2 Lambda codes.
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Old Thu, May-18-2017, 10:13:16 PM   #6
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Default Re: Post Header Install Misfire

They mixed up your o2 sensors primary from secondary I guarantee it.
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Old Thu, May-18-2017, 10:14:53 PM   #7
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Default Re: Post Header Install Misfire

Quote:
Originally Posted by Sandeep1212 View Post
Maybe the 02s were damaged or put back on in the wrong place.

It most likely not tune related
+1.

When I did this to my 330CI, the shop put the two O2 sensors back on in reverse order - and it caused that exact issue. I could sometimes (it was like this for 3 days before I figured it out) 'trick' the computer, by starting the engine and then zooming out of my driveway without hesitation - if I did this, she'd be a runnin' sumbetch. If I let it gather its bearings at all, she'd be a sadsack bunch of bumble-f--ks: missing, studdering, idling rough.

Give it a try!
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Old Thu, May-18-2017, 10:25:33 PM   #8
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Default Re: Post Header Install Misfire

Could I do it myself without a jack? ?

Is It safe to drive around? I don't want to grenade my engine by going too lean!
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Last edited by SeanE46; Thu, May-18-2017 at 10:41:50 PM.
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Old Thu, May-18-2017, 11:10:01 PM   #9
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Default Re: Post Header Install Misfire

Quote:
Originally Posted by SeanE46 View Post
Could I do it myself without a jack? ?

Is It safe to drive around? I don't want to grenade my engine by going too lean!
I'm not sure... I had my shop fix it. It only took them a few minutes, but they have a hoist of course.

I drove the 330 for a few days like that, but of course, ignorance of catastrophic risks keeps 75% of cars on the road. If you're aware that this may make a lean condition, then I'm sure it'll happen to you.
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Old Fri, May-19-2017, 02:39:39 AM   #10
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Default Re: Post Header Install Misfire

You'll be fine, just don't drive it like an ******* and fix it.
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Discussing Post Header Install Misfire in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)