Engine lumpy and cutting out at tickover.

[Steve221]

My cupra has been running quite sweetly lately, been for a few long drives down south and it has been superb as ever. That was until Tuesday, I drove towards work and stopped to fill up at the usual Shell garage (Car was fine on the 10 miles from home), put 42 quids worth of optimax in and set off. Got to the first roundabout/junction and at tickover the revs are constantly dropping and rising just before it stalls.

It continued to do this at every stop, the revs drop and shake the car around with the odd clunking noise, it will sometimes cut out if the air-con is running. If I touch the throttle, the engine seems to rev sweetly enough and the performance while on the move has not suffered at all.

I'm beginning to think I may have got a dodgy batch of optimax, I topped it up with normal unleaded last night from a different garage, I got 13 quid in but hasn't made a difference.

Any ideas?

 

[Pabs]

could be the optimax, my car used to run like that on supermarket petrol.
empty the tank and refill and see if problem still occurs.
Have a search in these forums cos there is loads of threads on similar/identical problems. Might give u some things to try, check all pipework and dv connections, along with the n75 valve, possibly do a tb realignment or get tb cleaned.

 

[flashbsd]

ive had it in the past, dodgy batch of fuel! bet you got the bottom of their tanks!

one thing you should try, is just simply unplugging the MAF sensor attached to the air box, and see if it solves it, mine ran very lumpy and i pin pointed it to be the MAF.

p.s you didn't put optimax diesil in did ya?

 

[Pabs]

oh yeh, and check maf.

 

[Pabs]

damn, beaten to it. lol

 

[Steve221]

lol, cheers guys, i'll wait till the tank is done, it did only happen straight after I filled up. Then look into the MAF.

 

[-DT-]

My cupra has been running quite sweetly lately, been for a few long drives down south and it has been superb as ever. That was until Tuesday, I drove towards work and stopped to fill up at the usual Shell garage (Car was fine on the 10 miles from home), put 42 quids worth of optimax in and set off. Got to the first roundabout/junction and at tickover the revs are constantly dropping and rising just before it stalls.

It continued to do this at every stop, the revs drop and shake the car around with the odd clunking noise, it will sometimes cut out if the air-con is running. If I touch the throttle, the engine seems to rev sweetly enough and the performance while on the move has not suffered at all.

I'm beginning to think I may have got a dodgy batch of optimax, I topped it up with normal unleaded last night from a different garage, I got 13 quid in but hasn't made a difference.

Any ideas?

Could be the throttle body needs cleaning? At least that's what it was with mine.... £50 to get it done at Seat...

 

[Pabs]

£50 to clean the tb??? bloody hell.

 

[DPJ]

£50 to clean the tb??? bloody hell.

Not the outside!

Work out the labour to remove, clean and reinstall.

 

[Pabs]

surely less than 1 hrs work? - well when they did mine it was done in 1/2hr, local garage @ £30/hr so closer to £15?
Anyway, i know dealers are a rip off - hence my comment.

 

[soper1981]

Sorry to dig this back up again but I've had this exact same problem with my LC, especialy when I leave work and the car is on idle. But how did you get on and is the problem sorted now?

 

[Pabs]

i've read that the cleaning of the TB does the trick. I have changed/checked everything else, including changing spark plugs. Its better, but not perfect. Apparantly spraying the tb with some cleaner can do the trick, but don't hold me to this...

 

[JRB]

could be the idle control valve or stepper motor as it is more commonly known

 

[Fl@pper]

take the throttle body off yaself an clean it with FORTÉ AIR INTAKE CLEANER

takes all of 10/15 mins and costs no more than a £10 have heard of people spraying em with it still fitted

according to this months top tips its useful on idle and EGR valves too

 

[Pabs]

Flapper, how do you spray it with it still on the car? I assume you just remove the intercooler hose and have a spray that way, then connect all back up and switch the engine on?


If you take it off, are there specific torque settings and do you have to change the gasket?

 

[cupra-c_ya]

I am thinking of doing this on my car, does anyone have a detailed guide on the cleaning of the TB on the car or off the car, looked through loads of threads and cant find a proper guide, anyone got a guide with pics of the TB location on the leon etc? thanks

added on to this thread rather then start another thread.