acceleration hesitant

[lorne]

Hi I have a problem with acceleration,which some of you guys have helped me out with in the past....unfortunately i've still got it 6 months on.
The car is a 1.8 t cupra 52 plate
The problems I notice are:

1: When accelerating moderately in low gears,the car seems to jerk as if the turbo cuts in late,and accelerates as normal.Now i've noticed that when I put my foot on the clutch,the engine pulls pack as if the clutch just slipped.This fault however is sometimes very obvious and other times not.....much more so when its cold tho.This also is not a problem during harsh acceleration.

2: The idle seems juddery

3: Can smell something like gone off petrol or petrol mixed with an air freshner????

Ive tried changing the maf sensor,testing the coil packs with new onesand its been to seats who have test driven it and tried out about 6 diagnostic checks....all clear.
Seats cannot find a fault,but there is 1 for sure.

The 1 thing ive tried,which worked for a couple of months was to squirt throttle cleaner in the throttle housing.I've tried to do this since,but the fault remains.

Id love some more ideas please,
Thankyou

 

[Snoopie]

Much more when it's cold, would definately sound like your coolant temp sensor, and obviously as it's cold it's either overfueling etc.
Also sounds like you may have some dirt in your Throttle Body.

 

[lorne]

Thanks for your reply mate,the stealers did mention the coolent temp but said it should show up on the diagnostics????
I even tried spraying the throttle body again tonight and also cleaned out the air filter housing.
I've been told the n75 could be screwed,but ive got no idea what it is or if it can be fitted by me???

 

[Snoopie]

Have a quick search for the N75 valves. They can be replaced or removed. Just for a comparison, if you still have a warranty (You may have just bought the car, and been given 1 year's Seat extended warranty) I don't know. But it may be worth taking it to another Seat dealer's and getting them to find the fault. (I will sympathise that the diagnostic checks aren't cheap at £47 + VAT aren't cheap) Not slagging off your dealer's, but the Coolant Temps are common problems as far as I'm aware, and would be better for you to have a second opinion, incase for whatever reason, the diagnostic check wasn't carried out etc. If you can, ask for a report.

Cheers.

 

[jetsetjimbo]

I have had this exact same thing in the past to some extent.

Seemed to me to bemuch worse when running supermarket unleaded over Shell Optimax/V Power.

I had lost of things suggested to me that could be the cause (although while under warranty the dealer refused to accept there was anything happpening even after several test drives). I think it may be related to spark plugs possibly as it first occured for me after the 40k service where they were changed.

The plugs were taken out an checked at the 50k service the other week and I thought it had gone (running on V power) but having put £20 of Saninsburys Super in it is noticable again now.

Have you had a Revo / trial at all?

 

[lorne]

Ah i'm so glad someone else has experienced similar problems....the stealers are making me think im going mad!
I normally always use optimax and i've also replaced all the plugs.

Snoopie you are right about the temp sensor,I have heard this mentioned by you guys and also the stealers,although they may as well rip off my arm and take it home with em for the price....aprox £150.This will prove to be a very expensive repair if the problem still isn't fixed.

Jimbo,have you tried anything I haven't???I've not had a revo either,would that be worth doing?

 

[Ste]

Have a very similar issue on my 02 LC as well. Most of the time it's fine, and then sometimes the revs on idle will fluctuate and the car will stutter.

I'm going to get it looked at a week after next when I get my suspension done. Will let you know if it gets sorted and what needed doing. Suspect coil packs or throttle body needs cleaning and re-aligning.

 

[lorne]

I've just bought an N75 valve for £43 delivered,which is only a bit more expensive than a diagnostic check. I've read its easily fitted so may as well give it a go.
For those who dont know, the n75 controls the boost on the turbo apparently,so I guess this would could be a promising thing to try first???

 

[lorne]

P.s that would be great to get any info from your visit to the garage,thanks

 

[jetsetjimbo]

I haven't had a Revo but I had a trial and it seemed to come on after that but that could well be a coinsidence.

There was a guy on Briskoda ages ago that had a very similar thing on his Octy. He said that a full throttle body clean sorted it. Apparently if you do a lot of stop start motoring it can get very dirty. I haven't tried that one yet - I take it you have had the throttle body off the inlet manifold to clean it already?

The N75 may well sort it... I think the specific issue you have (which sounds exactly the same as I have) can get confused with others causing us to discount things that people have tried that haven't helped with thier problems.

When are you expecting the N75?

 

[lorne]

I do keep hearing about the throttle body and I assume i've done all there is? I've gone as far as taking that aprox 3" pipe off,then opening up the little shutter thing (technical term) in there,and spaying the heck out of the insides lol
Is there anything else I need to do?

 

[jetsetjimbo]

I think that you can clean it better by unbolting the throttle body itself and cleaning from that end. As I understand it there is a delicate paper gasket between the TB and Manifold.

Remember that the TB is delicate if you do take it off.

I have an LCR so can comment on the ease of doing it on a LC. I just need to get a spare paper gasket incase I bork it.

 

[lorne]

Borking it is my field of expertise!!!
Bummer I haven't done that yet, i'm guessing if there is a gasket,it would need to be replaced anyway after taking it off wouldn't it?

 

[Snoopie]

Ah i'm so glad someone else has experienced similar problems....the stealers are making me think im going mad!
I normally always use optimax and i've also replaced all the plugs.

Snoopie you are right about the temp sensor,I have heard this mentioned by you guys and also the stealers,although they may as well rip off my arm and take it home with em for the price....aprox £150.This will prove to be a very expensive repair if the problem still isn't fixed.

Jimbo,have you tried anything I haven't???I've not had a revo either,would that be worth doing?

£150? £57 including parts, labour & VAT. If not, It should be very close.

 

[lorne]

your kidding? If thats the case,they're gunna be reported to seat hq!

 

[Snoopie]

Certainly no more.

 

[jetsetjimbo]

Have you had the new N75 through yet?

 

[lorne]

Yea got it through today,I would fit it now but I haven't had a look into whats involved yet and apparently theres some lovely 'one use' clips holding it on.....i'm not particulary in the mood for bodging duck tape on tonight if the worst does happen,so will prob leave it till the weekend

 

[RobM]

N75 is easy to fit, but the one-time-use clips are a total sod to remove. They are the same on the DV too. You literally need to go at them with cutters, pliers, or anything else that might break it off!

Once off, it should be fairly straight forward, just change it like-for-like. Three tubes and one electrical connection and you're done.

 

[lorne]

Sounds like im going to need a stress ball ready for this job! either that or maybe I could work my girlfriend up enough and let her loose on it....or maybe not lol

I take it I would need some jubilee clips to replace them,or would cable ties do a good enough job?