Misfire on cold start

[iSamKing]

I have a Leon cupra 1.8t AUQ, basically when I start up first thing in the morning or after a day at work it misfires and runs lumpy, after about a minute it's fine, I've scanned it and theres no fault codes.

Any ideas??

 

[T108]

i have the same, been trying to find the cause for months

 

[matty85]

i have the same, been trying to find the cause for months

I now have changed mine and I will be able to show you a easy fix for yours. I will take a photo in a bit. T108 every cold start it is hard to pull away and you have no power till you build the revs up?

 

[iSamKing]

See as soon as I pick up the revs it goes it's just On idle but if I let off after revving it will idle lumpy again. I did a throttle adaption a little while back it seemed tos sort it out for a while but I did it again the other dat and it hasn't worked.

 

[T108]

mine is a missfire when under load from stone cold, first time she goes into boost really holds back with massive popping antilag sounding misfire then clears after a couple of seconds and goes fine the reat of the day.

iSam i would check what readings your MAf is giving at idle

 

[shakzTDI]

Try a coolent temp sensor cheap to replace use a genuine 1 about 30£ from tps

 

[Tingle13]

I have the same problem ! Had the coil packs all replaced under warranty and had the temp sensor changed still no luck ! Any ideas it's bugging me now ! Anyone ?? Thanks

 

[iSamKing]

Try a coolent temp sensor cheap to replace use a genuine 1 about 30£ from tps

That got changed about 6 months ago mate

I have the same problem ! Had the coil packs all replaced under warranty and had the temp sensor changed still no luck ! Any ideas it's bugging me now ! Anyone ?? Thanks

In pretty sure it's the MAF sensor, I recently fully serviced my car with no luck still I swapped over my MAF and it didn't do it this morning. I will see how it goes when I leave work and let you know how it is.

 

[BoostHard]

Mine does the same, Runs very rich one 1st start up, almost seems as if its flooding it self,
Runs really lumpy, Clears after a minute or two, Once the revs drop to normal idle

 

[Tingle13]

Im Exactly the same as you boosthard it's driving me mad !
Idle control valve ?
MAF ?

 

[iSamKing]

Mine does the same, Runs very rich one 1st start up, almost seems as if its flooding it self,
Runs really lumpy, Clears after a minute or two, Once the revs drop to normal idle

Im Exactly the same as you boosthard it's driving me mad !
Idle control valve ?
MAF ?

Get your MAFs checked. Mines seemed to be cured!

 

[Tingle13]

Any ideas where to get a MAF from on here ?

 

[iSamKing]

Any ideas where to get a MAF from on here ?

Euro car parts are fairly cheap, but make sure you ask for a genuine Bosch one.

 

[Azza_]

looks like its a common problem as mine does the same, as soon as the sai stops its fine, maybe its something to do with that?

 

[Tingle13]

There's loads of different makes for a MAF is it best to get a Bosche one ?

 

[seatcupramad23]

bet none of you have tried replacing the actually plugs ? had exactly same problem with my cupra I bought recently from cold start it misfire like crazy but after a minute it would perfect again , checked all vacuum lines then replaced all coilpacks but problem still there I took out all the plugs and 2 very black and sooty , replaced all four with oem ngk plugs and problem as completely gone no issues from cold anymore at all

 

[DaveGT84]

I've got the same problem. Changed the maf, coilpacks, plugs and full service and its still the same

 

[iSamKing]

There's loads of different makes for a MAF is it best to get a Bosche one ?

100% Bosch

bet none of you have tried replacing the actually plugs ? had exactly same problem with my cupra I bought recently from cold start it misfire like crazy but after a minute it would perfect again , checked all vacuum lines then replaced all coilpacks but problem still there I took out all the plugs and 2 very black and sooty , replaced all four with oem ngk plugs and problem as completely gone no issues from cold anymore at all

I did change my plugs with no luck.

I've got the same problem. Changed the maf, coilpacks, plugs and full service and its still the same

Try the engine coolant temp sensor mate.

 

[BoostHard]

bet none of you have tried replacing the actually plugs ? had exactly same problem with my cupra I bought recently from cold start it misfire like crazy but after a minute it would perfect again , checked all vacuum lines then replaced all coilpacks but problem still there I took out all the plugs and 2 very black and sooty , replaced all four with oem ngk plugs and problem as completely gone no issues from cold anymore at all

My car had a full service to try and cure this, Plugs, oil, Filters

 

[Tingle13]

New MAF ordered from GSF £88 plus VAT gonna fit it tomorrow night