Thrashed the car - ecu warning light flashed - now not running on all cylinders

[DuBDuDe]

Hi Guys,

There's a bit of history to this problem. and i think my problem now is a worsening of the same problem. See this thread.

http://www.seatcupra.net/forums/showthread.php?t=341063

Basically this is the previous prob

Leon Cupra 180 - Hesitant almost spluttery under gentle acceleration

My Leon Cupra Sport does this under gentle acceleration. It almost feels like when you have a shafted dizzy cap and rotor arm. Used to happen to my old golf the in the winter if the cap and rotor arm were worn anyway.

THe car almost splutters when feathering the throttle but if you floor it the car accelerates hard without any problems like you would expect. It only happens when i am being conservative with the throttle. When i'm brutal with it the car flies. Could it even be fuel starvation? Or a prob with the turbo? Doesn't sound like there are any leaks and the problem would be more apparent under hard acceleration if it was a turbo leak. It certainly would feel under power if it was a leak. Feels more like an ignition problem.

I've checked for ecu faults with my vagcom and nothing comes up.

Any ideas???

Then tonight i thrashed it out of a junction and the ecu light starting flashing which i havent seen it do before. Usually it's on or off. And now the car is misfiring on some/all cylinders. I plugged in vagcom at the roadside and the following fault code came up

VAG-COM Version: Release 409.1-US

Control Module Part Number: 06A 906 032 MJ
Component and/or Version: 1.8L R4/5VT 0003
Software Coding: 11510
Work Shop Code: WSC 06402
Additional Info: VSSZZZ1MZ3R095593 SEZ7Z0C1924123
2 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16688 - Shareware Version. To Decode all DTCs
P0304 - 35-00 - Please Register/Activate

Any ideas where to start looking for the cause?

I'm going to have a look to identify the fault code that can't be decoded due to the free version of vagcom but i'm guessing it's going to give some kind of generic description and won't be too specific.

Helop would be much appreciated.

Mark

 

[DuBDuDe]

Ok so the unknown code indicates a cylinder 4 misfire. I gues the first thing to do is change the plugs and see if that cures it.

What else do you reckon could cause it??

 

[DuBDuDe]

Right i've swapped the spark plugs and checked that the coil packs are all secure but i've still got the misfire. It's weird cos ive got two error codes. One says misfire on cylinder four and the other says random multiple misfire. I'm a bit lost for ideas.

 

[DaNnY_LaD]

Tried new coils?

 

[DuBDuDe]

i might try to swap the coil from cylinder four to another cylinder to see if the problem follows it. Bu thte fact its showing misfire on multiple cyclinders would mean more than one coil has failed at the same time..... a bit unlikely i thought. Or does that error come up even when it's only misfiring on one cylinder???

 

[ibizacupra]

quite likely in fact if they're all of similar age.

replace them all if you can.. even spark on all cylinders is best

they do get weaker hence causing misfires.

 

[DuBDuDe]

Ah if that's the case i'll get some new coils. Anyone know a good supplier to get bosch ones at reasonable prices? Seen some on the bay for 25 quid a cylinder that are sold as Bosch. Never quite trust ebay fully tho with things like that.

 

[DuBDuDe]

right i went down euro's and got 4 Beru ignition coils for 105 quid. Replaced the one on cylinder 4 first and fired the car up. All seems fine. It's even lost the minor hesitation it had before. Is it worth replacing the other three (bearing in mind one is red and looks like it's been replaced already) or shall i take them back and get my money back? Might just keep one in case another goes soon.

 

[DaNnY_LaD]

Replace them all... Once one goes the others follow in suit but the free in the boot as spares