missfire in 4th gear only???

[jamie_20vt]

hi peeps, i gave the cupra a bit of a run today (after not being able to pull away from my brother in his 106 gti to other day). it revs and pulls well in 2nd and 3rd but then missfires at 5k in 4th. its like hitting the limiter and it wont rev past it. 5th also seems slugish but didn't get the revs that high in 5th as i think thats pushing it a bit on public roads. it may have been like this for a while and i just havent noticed as i dont usually drive round like a loon!

im probally just going to change all the coil packs but thought it was strange it was just doing it in 4th???

also will GSF coils and plugs be ok? ive also heard people using 'bolt down' coils. are these from a different model or something?

sorry for bringing up a familiar problem but all the threads ive searched seem to have a steady missfire in all gears, but mine isn't doing this. im gutted as i have about £100 to spend on a good engine service but now i have to spend it all on coils!!!

 

[ibizacupra]

higher gears, higher loads, and usually higher boost
most likely is coil pack if its a proper misfire

unless its a lean misfire and a failing maf... which may account for the 106 issue

 

[AlexGSi2000]

Coil pack is on its way out, mine was the same the other week.

I replaced all four with these: (free delivery on orders over £50)

http://www.eurocarparts.com/ecp/c/S...a807035569a2e58683430b24d597e1e4055550df&IGCO

I also changed the sparkplugs at the same time for good measure, its been fine since.

 

[Ibiza125]

I would only buy coilpacks from a dealer to be honest... Like £5 more for a genuine bit of kit...

You can go to Audi and order S3 coilpacks which have the bolt-down but you have to make sure and ask for the bolt-down as they have push downs as well. Also to make sure your rocker cover has the bolt holes to accommodate...

 

[jamie_20vt]

I would only buy coilpacks from a dealer to be honest... Like £5 more for a genuine bit of kit...

You can go to Audi and order S3 coilpacks which have the bolt-down but you have to make sure and ask for the bolt-down as they have push downs as well. Also to make sure your rocker cover has the bolt holes to accommodate...

this is a good option as my mate is an Audi mechanic, so cheap parts!! is it any specific model s3?? older 225 or 210 maybe??

 

[jamie_20vt]

I also changed the sparkplugs at the same time for good measure, its been fine since.

which/where did you get your plugs from mate. have heard roumors of bits falling of spark plugs or is this only really high end bhp???

 

[jamie_20vt]

higher gears, higher loads, and usually higher boost
most likely is coil pack if its a proper misfire

unless its a lean misfire and a failing maf... which may account for the 106 issue

mine starts to miss then repeatedly misses and pops till i take my foot off and back off. not sure which of the above this is.

im also running stnd air filter as ive heard aftermarket ones bugger these up? altough i think im going to go for a green cotton one!!

 

[jamie_20vt]

Also to make sure your rocker cover has the bolt holes to accommodate...

looking at the rocker from the front of the car there is 1 un-used tapped hole(M5 or 6 looks like) on the left of each coil. so looks like there there!

 

[redcupraboy]

which/where did you get your plugs from mate. have heard roumors of bits falling of spark plugs or is this only really high end bhp???

The plugs that are known to fail/break are Denso IK22s. Stick with NGK plugs they are fine.

 

[Ibiza125]

this is a good option as my mate is an Audi mechanic, so cheap parts!! is it any specific model s3?? older 225 or 210 maybe??

I will try and dig the part number out for you.

looking at the rocker from the front of the car there is 1 un-used tapped hole(M5 or 6 looks like) on the left of each coil. so looks like there there!

There should be 2 holes one at the top left and one at the bottom right of each coil. One bolt securing it down would be enough though.

 

[jamie_20vt]

I will try and dig the part number out for you.



There should be 2 holes one at the top left and one at the bottom right of each coil. One bolt securing it down would be enough though.

cheers, that would be good!! if the second hole is closer to the back of the engine maybe i couldn't see it!!

anyone know the price of s3 coils from Audi. i'll be able to get them with staff discount but just want a rough price!!

 

[tarzan]

i have the s3 or 225hp boltdown coils for over 2 years no problems can check the number on then tomorrow

 

[jamie_20vt]

i have the s3 or 225hp boltdown coils for over 2 years no problems can check the number on then tomorrow

are these a direct replacement??? my mate at audi seems to think the conectors are different!!! anyone got a part number??

 

[ibizacupra]

s3 ones will fit yes

 

[jamie_20vt]

after changing my plugs and coils, i used genuine s3 non bolt down coils and prf6q plugs(single point ngk one) im still having the same problem.

the car is flat out at 110-120 ish on my private road due to missfire. but it pulls well in all gears up to this speed and the missfire starts in 4th.

the car has also had a service (oil & filter, fuel filter). any other ideas now ive ruled that out???

 

[tommy2008cupra]

any codes? eml?

 

[jamie_20vt]

any codes? eml?

forgot to mention ive just got vag-com and no faults are coming up. but im still learning how to use it and struggling with an un-licensensed version with a crack!!

 

[AlexGSi2000]

which/where did you get your plugs from mate. have heard roumors of bits falling of spark plugs or is this only really high end bhp???

www.sparkplugs.co.uk

 

[cupramillo]

NGK BKR7E's are brilliant plugs, cheap aswell, they get the thumbs up from me!

 

[ibizacupra]

is it running lean at that speed?
what colour are your plugs after the thrashing?