Misfire when under load VAGCOM RESULTS PG 2

[cupra_spencer]

Hi all.
my car has been misfiring recently even on idle so i changed the offending coilpack for a new one and now it idles fine but goes onto 3 cylinders when you put your foot down?

any ideas? has got new plugs in also...

 

[ian_cupra]

another coilpack, sometimes they miss under load, and sometimes totally

 

[cupra_spencer]

thanks for that mate. just kinda tested the coils out by starting the engine and lifting each coil out to see if it was sparking.

looking at the front of the car it was the 2nd in from the left that i thought had gone as i did this test and this was the only one not sparking and once replaced it then idled fine. so i replaced it with a brand new one tonite

then i took it out for a drive and anything over 7psi it runs on 3 cylinders.

so i did the test again. the coil furthest left was sparking intermittently then stopping then starting then stopping etc. and when i put it back on the car the car idled smooth again. did the same with the one i just replaced (£30) and this one didnt have a spark at all? the next two did (the one on the far right and the one next to it)

i dont understand... surely there would be an intermittent regular spark pattern on all? the only one that i would say may be faulty is the one on the far left that sparks then stops then sparks again.

what would you say?

 

[ian_cupra]

its just the extra load thats doing it, coil is just giving up

 

[cupra_spencer]

so would you advise replacing the other three or just do it one at a time?

strapped for cash thats all mate.

 

[ian_cupra]

get one, and try it in each one til you get it right

if you can afford it get them all

 

[Robbie C]

Often once one goes the others soon follow. When a coil goes it can weaken the others with the extra work they have to do to keep the engine running. When my first one went the remaining 3 went within 6 weeks at random intervals

 

[cupra_spencer]

get one, and try it in each one til you get it right

if you can afford it get them all

right.

i have changed all the coils for new ones and just bought some new spark plugs also. all fitted and i still got the problem. is a patially blocked injector possible?

if so, im thinkin that it is getting enough fuel into the offending cylinder on low boost but when it comes on high boost the fuelling is increased in all cylinders apart from one of them due to the injector being partially blocked?

please help! iv had the car 1 week and all iv had so far is problems! just want it running right!


any more ideas?

 

[M87NER]

any faults with Vagcom?

 

[jam666999]

My car felt like it was misfiring under load and after checking the coils it turned out to be the MAF.

 

[cupra_spencer]

any faults with Vagcom?

i havnt got a vagcom mate and havnt got the cash to get one

 

[cupra_spencer]

My car felt like it was misfiring under load and after checking the coils it turned out to be the MAF.

i have tried unplugging the MAF sensor and running the car but the problem stays the same.

i rang seat and they want £65 + VAT for a diagnostics!!!

they also said it could be a valve sticking??? somehow i dont think so.

 

[cupra_spencer]

JUST A BIT MORE INFO: its when the car gets over 8psi that it decides to jump onto 3 cylinders...

 

[ian_cupra]

where you based? could try and find someone on here local to you and see if they would be so kind as to vag-com your car

 

[cupra_spencer]

im based in leicestershire area mate DE12 7HJ

 

[ian_cupra]

if you post in the vag-com area of the forum, asking for help in your area, hopefuly someone will be able to help you

 

[wilz]

I hve had same problem as you and went through the elimination process after on vagcom

of maf, n75, precat lambda, and eventually got down to the spark plugs, coil packs and thats the end of it.

Some expense.

 

[cupra_spencer]

thats just it though. iv changed the plugs and coils!

 

[wilz]

Well the pre cat lambda, possibly better off with vag com but all of the above is worth having a look at.

 

[cupra_spencer]

whats the N75? also i got no cat.