2.0 16v misfire (Part 2)

[AndyMcGinn]

Hi.dont know if any of u remember my post a while ago about a misfiring P reg 2.0 16v cupra sport.

Any way heres the problem iv still got a serious misfire which is gradualy getting worse. Starts to misfire when the revs get to 2600 rpm when accelerating on part load. It still misfire on full throttle but not quite as bad. And it ticks over a little bit uneven but not much. But after driving for about 15 - 20 mins it will clear and run fine. How ever if the car is switched of and back on the misfire returns.

The misfire cant be pined down to one cylinder so it dosnt seem to be mechanical.

The flue pump dosnt take long to get the pressure up when the ignition is switched on, and as it will run flat out with no problems once the misfire clears So i dont think its a problem with the fule pump.

So far iv spent about £300 to replace the coil, rotor arm, distributor cap, HT leads, Sparkplugs, The distributor has been tested and im told its working ok. and iv also replaced the engine speed sensor.

Iv had it on the computer at my mate's garage and its also been in to a seat dealer, And they both said there was an implausible signal from the speed sensor, but after replacing it the fault is still the same. Anyone got any ideas as im clean out of them.

Confused yet? i am!

If anyone has any thought i would love to hear them

Cheers Andy

P.S Is there anyway of contacting anyone at Seat that might know what my problem is.

 

[Garth]

I sorry I can't help, but just thought I'd let you know I have exactly the same problem

I took it in for a full service a few weeks ago and when I picked it up, the monkey at the SEAT garage said: "There's a slight misfire on it, but we can't be sure what it is unless we hook it up to the computer" The lazy b@st@rds didn't even hook it up to the computer for an 80,000 mile service!!

I'm going to take mine to the local VW garage (it is a vw engine after all). If I get any luck there, I'll post up here.

 

[edc]

Seems like you have tried the lot. On CGTI another guy with an ABF Golf had a very similar problem but it turned out to be the ignition coil.

What about the cam timing?

 

[AndyMcGinn]

Cheers Garth mines away into another garage tomorow .if they have any luck i will let u know. But im begining to thinkits a wiering fault,maybe a witre with to high resistance or somthing. u could try checking your vacume pipes i here there a comon fault of misfires on these engines

 

[AndyMcGinn]

Edc... i dont think its cam timing just had the belt done. but it runs ok sometimes where as if iy was cam timing u would expect it to run a bit ruf all the time.but cheers anyway

 

[AndyMcGinn]

Quick update if anyone is intrested

Sent the car of to some guy with a lap top and a box of tricks. He seems to think its down to a bad earth or somthing like that.

 

[Garth]

I'll try to check all my pipes and wires this week if I get the time. I went to VW and it turns out their parts are half the price of North East SEAT! Top guys at Carrs VW in Hexham.

I've got to bring my car back sometime this week to get it looked at.

My next car will now DEFINATELY NOT be a SEAT, it's between a golf and A3 1.8T now. The service at the VW garage is leagues ahead of NE SEAT, so I'm never going back there.

 

[2.0 16v]

Andy did you find out the cause of your miss fire. Have a similar problem with car and have as yet not found the cause. was an earth fault? or a component on the engine. any info would be greatfull.

 

[AndyMcGinn]

Hi it turned out to be my lamda sesnor had kicked the bucket. cost about 50 quid to get a new one fitted. u will find it down the back of the engine sticking out the exhaust. since then iv head of another guy had the same problem and it was the same on his car. Give it a go and let me know how u get on

If ur anywhere near glasgow i recomend taking ur car to E.S alternators they had my car for 4 weeks did loads of stuff to it and only charged me £130 there good guys



Andy

 

[2.0 16v]

sorry to say already had the lamber prob change by seat. any other iders?
list of all things changed.

1- lamber prob
2- ecu temp sender
3- plugs
4- ht leads
5- diss cap
6- rotor arm
7- normal temp sender
8- ecu relay 33
9- had 5051 test done at seat's.


cheers for reply.

 

[AndyMcGinn]

dont know, maybe a ecu fault, i would say try checking the mecahnical side of things, probably wont be the fault but it would rule somthing else out .. try getting a compresion test, What about the fule pump or the fule pump relay. or engine speed sensor

i took my car to seat and they never had a clue i told them more than they told me, might be woth getting the car put into a independant garrage or a specialist

best of luck i hate fule injection .what was the problem with carbs anyway

 

[madmand]

Hi am another person with the same problem! arh

Done new leads, dizzy, roter arm, ingniton coil, sparkplugs and had the ecu read but no faults in it.

I thought if the sensors where faulty the ecu would register a fault. so if the lamba sensor was broke shurly it would show when the ecu was read?

Thanks Mandy

 

[AndyMcGinn]

it was actualy a wire from the lamda sensor had melted onto the exhaust and was causing the problems...aparenty the ecu didnt like this .

 

[madmand]

ok cheers will get it put on ramp tomorrow 2 check cant see anything because of belly pan and its raining!

 

[Revo Kev]

Try disconnecting the ECU and cleaning up the spades... sometimes get damp and oxidise. Had a similar thing on my 16v where it felt like a misfire and was slightly flat.

 

[goose]

Had a couple of similar problems on the Toledo section.

http://www.seatcupra.net/forums/showthread.php?t=100222

and here

http://www.seatcupra.net/forums/showthread.php?t=102147

Turned out to be the Ignition Control Unit.

HTH

 

[madmand]

Hi thanks for the replys any help is greatly appreciated.

I have had the lamba sensor replaced but no joy unfortunatly. I will clean the spades tomorrow and see if that does anything thanks. If that dont work i will have to book it into a specialist.

 

[Fl@pper]

sensor fault listed is a pointer to an area not neccesarily the part at fault

if its been changed then it is the signal supplied by it or the way it provides it - as said wiring/spades/pins etc or even a bad earth to the sensor itself or anything concerned with it

i knew of a different marque with a similar problem that turned out to be when a new clutch was fitted they had broken off the teeth on the flywheel in one spot

as soon as they mentioned it made a funny noise on starting now and then - BINGO

it probably doesnt help but dont take a diagnostic machines listing as a cure - purely as an idea where to start looking

 

[madmand]

I think i am just having bad luck with this car now.

I bought a direct fit lamba sensor but did not seem to make any diffrence. So i had it sent to a rolling road where they found it to be my lamba sensor and replaced it with a universal one and chopped my wires of it so i couldnt even send the new one back under warrenty so £85 quid down plus the bill for the new one and the dianostics!

Thanks for the reply bout the ecu had them cleaned and the rest of the connections to the sensors too but no joy!

The car is now a bit better but still have this judder but not as bad arh!!!