Misfire and running rough from cold?
Misfire and running rough from cold?
Just a qwick one for you lads wht do you think?
From complete cold the 4 misfires an runs rough, once warmed up abit it runs perfect.
It had a lambda sensor fault bank 2 sensor 2 so i replaced it with new now there is no fault with it. Drive it From cold an he Engine light flashes few times then goes off VCDS just says random misfire.
It has also had new oem coil packs an plugs fitted all 8.
Any idea's?
Cheers.
From complete cold the 4 misfires an runs rough, once warmed up abit it runs perfect.
It had a lambda sensor fault bank 2 sensor 2 so i replaced it with new now there is no fault with it. Drive it From cold an he Engine light flashes few times then goes off VCDS just says random misfire.
It has also had new oem coil packs an plugs fitted all 8.
Any idea's?
Cheers.
Current-saloon rs4,Full decat Xpipe miltek,cold air feed,BMC air filter, TTS supercharged, MRC stage 3 L/C F/S,hell s+s brake lines,AP racing rotors + vagbremtechnic bells, kw v3s clifford 650mk2
Gone-audi s3 8p stage2+ with loba lo400 turbo.
Gone-audi s3 8p stage2+ with loba lo400 turbo.
Re: Misfire and running rough from cold?
I've got exactly the same thing although my VCDS hasn't picked up a miss fire!!!.
When cold it pops and bangs and misses but as soon as its got some temp in it then all is absolutely fine.
To be fair I have had it since I did the CC in which I removed the flaps and added the JHM spacers so I put it down to this combined with the SAI as it hasn't been mapped to accept the mods yet!!
When cold it pops and bangs and misses but as soon as its got some temp in it then all is absolutely fine.
To be fair I have had it since I did the CC in which I removed the flaps and added the JHM spacers so I put it down to this combined with the SAI as it hasn't been mapped to accept the mods yet!!
- Surrey Sam
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Re: Misfire and running rough from cold?
Removing the flaps will cause less swirl/tumble, this could effect the cars engine running when cold and at low RPM. A misfire does seem a rather excessive result for flap removal though?
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Re: Misfire and running rough from cold?
Surrey Sam wrote:Removing the flaps will cause less swirl/tumble, this could effect the cars engine running when cold and at low RPM. A misfire does seem a rather excessive result for flap removal though?
Agreed Sam. I had heard that some people did experience a bit of lumpiness when cold but not to the extent of missfire. Tbh sometimes I can start her up when not used for a few weeks and she's fine, other times she will have a bit of a splutter but it's only under load and not at idle at any point!!!
Re: Misfire and running rough from cold?
Could be a passing injector, I had number 6 cause me problems until I changed it. The plug gets a little wet causing it not to spark properly.
Misano Red RS4 B7 Avant
Re: Misfire and running rough from cold?
Yep same as mine. Only needs to warm up a little an its fine. Very odd.RichieRS wrote:I've got exactly the same thing although my VCDS hasn't picked up a miss fire!!!.
When cold it pops and bangs and misses but as soon as its got some temp in it then all is absolutely fine.
To be fair I have had it since I did the CC in which I removed the flaps and added the JHM spacers so I put it down to this combined with the SAI as it hasn't been mapped to accept the mods yet!!
Current-saloon rs4,Full decat Xpipe miltek,cold air feed,BMC air filter, TTS supercharged, MRC stage 3 L/C F/S,hell s+s brake lines,AP racing rotors + vagbremtechnic bells, kw v3s clifford 650mk2
Gone-audi s3 8p stage2+ with loba lo400 turbo.
Gone-audi s3 8p stage2+ with loba lo400 turbo.
Re: Misfire and running rough from cold?
coffey555 wrote:Could be a passing injector, I had number 6 cause me problems until I changed it. The plug gets a little wet causing it not to spark properly.
Did this only happen when cold?.
Yes Luke. Very odd mate. I thought the stage 2 might sort the issue as it would get rid of the SAI and take into account the flaps being removed but obviously you have that and are still getting the issue!!!!
Re: Misfire and running rough from cold?
I mine has only recently started doing this. It was running sweet after the mrc map. I have managed to get a fault up an it number 6 misfire.RichieRS wrote:coffey555 wrote:Could be a passing injector, I had number 6 cause me problems until I changed it. The plug gets a little wet causing it not to spark properly.
Did this only happen when cold?.
Yes Luke. Very odd mate. I thought the stage 2 might sort the issue as it would get rid of the SAI and take into account the flaps being removed but obviously you have that and are still getting the issue!!!!
It is abit annoying though as i have just put 8 new plugs an coils in.
So ill be swoping that plug an coil to another cylinder an see what happends.
Current-saloon rs4,Full decat Xpipe miltek,cold air feed,BMC air filter, TTS supercharged, MRC stage 3 L/C F/S,hell s+s brake lines,AP racing rotors + vagbremtechnic bells, kw v3s clifford 650mk2
Gone-audi s3 8p stage2+ with loba lo400 turbo.
Gone-audi s3 8p stage2+ with loba lo400 turbo.
Re: Misfire and running rough from cold?
Lukes3 wrote:I mine has only recently started doing this. It was running sweet after the mrc map. I have managed to get a fault up an it number 6 misfire.RichieRS wrote:coffey555 wrote:Could be a passing injector, I had number 6 cause me problems until I changed it. The plug gets a little wet causing it not to spark properly.
Did this only happen when cold?.
Yes Luke. Very odd mate. I thought the stage 2 might sort the issue as it would get rid of the SAI and take into account the flaps being removed but obviously you have that and are still getting the issue!!!!
It is abit annoying though as i have just put 8 new plugs an coils in.
So ill be swoping that plug an coil to another cylinder an see what happends.
Very strange mate. Keep us updated with your progress in sorting this!!
Re: Misfire and running rough from cold?
It mostly happened from cold startup but it would misfire if coasting down a long hill off the throttle from time to time.
Fast forward a few years and I sometimes get a flashing then solid engine check light. This time always number 3 along with number 1 now and again. Happens on both cold and warm starts but never whilst actually driving.
Normally happens after short local trips around town so suspect the plugs might be getting fouled from long idles without the carbon being burnt off at the high revs.
When the injector was weeping that plug was wet and black, almosty oily. The other plugs were dry with white/grey deposits on them so quite easy to spot.
Fast forward a few years and I sometimes get a flashing then solid engine check light. This time always number 3 along with number 1 now and again. Happens on both cold and warm starts but never whilst actually driving.
Normally happens after short local trips around town so suspect the plugs might be getting fouled from long idles without the carbon being burnt off at the high revs.
When the injector was weeping that plug was wet and black, almosty oily. The other plugs were dry with white/grey deposits on them so quite easy to spot.
Misano Red RS4 B7 Avant
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