Quick question about my small turbo escoss. i'm doing the head gasket at the moment but just before i brought it into the garage i couldnt help but noticing that when i come up to traffic lights and put the clutch in the car revs go right down (below 1000RPM) then up again. it does it about twice then starts to idel fine again. it only seems to do it when it gets walm and ive bootes it. if i drive it round just tickling it (not bringing it on boost) it seems to be fine till walm. Could it be the fact that the head gasket was on its way out or could it be a faulty ECU

Any help Would be appriciated
Thanks

 

Wouldnt have thought it would be your ECU, with the head gasket problems you are having it could be related, maybe check the idle control valve for starters.

 

Just a guess what about the Lambda sensor

 

i've checked the idel control valve i'll check the lambda sensor tomoz thanks

 

give the trottle body a good clean .

 

Get a code reader on the ecu, it might save you hours of fruitless checking.

 

Mine does exactly the same as yours, exactly. Mine has just had a strip down including head gasket, mine actually stalls too...starts fine straight away. It never used to do this. The revs do the same as you, idles fine, then when you come to a rest at lights or something, it goes to abou 200rpm , then up...

IF you find the fault do let me know...cheers.

 

There must be someone who knows on here!!

 

The trouble is it could be any one of couple of dozen things causing the problem, hence my recommendation to get a code reader on it. Any modifications to the car?

 

sailorbob
Stage 1 but it only started doing it when i first got it i started to mess around as you do and took the air filter off to see if my old air filter would go on. then when i put it back together it started doiung it

 

So what filter is on there now, the original or a new one ? maybe you have knocked a pipe or the air filter isnt on properly ?

 

Richie Russ
THE ORIGINAL FILTER IS ON IT AND ALL BACK TO HOW IT WAS. A RIGHT MISTERY

 

You must have disturbed something though whilst you were doing it, the only thing i would do is take it somewhere for a once over if you have checked all the 'simple' things ?

 

can u suggest anything to check

 

How irratic is it ?

Oh and i know someone with some cossie wheels / tyres if you're interested.

 

very!

Do they wanna swap are they mint and any pictures of them

 

Danny you have pm.

I think your best bet is to take it to someone for them to look at, hows your wiring out of interest ?

 

the wiring is fine
alll i want to do is get my car running right, put it back to standard then sell it

 

Sounds to me like an air leak somewhere.

 

to be honest when taking the inlet off the head i noticed that the gasket looked a bit black rond one of the inlets and the rest looked alright

 

got it all back together but now when the car is walm and been driven for 5 mins the reves are going up then down then up then down and so on
any ideas

 

Well if it turns out to be the ECU, I have the one that came out of my car going cheap .

 

TRY CHECKING YOUR TYRE PRESSERS PAL IF FAILING THAT WE CAN SORT IT FOR 30 GRAND

 

It can be related to VSS sensor - EEC -IV has no working idling procedures if that sensor is faulty. I had this problem on mine.

 

in english please mate

 

VSS = vehicle speed sensor

 

wheres this situated mate

 

It's english mate!!

 

On the crosshaft that goes through sump. It's on the left hand side of the car and speedo cable goes into it it actually drives the speedo cable.

 

IIRC it's where the speedo cable comes out of the gearbox.

 

Not exactly the gearbox...

 

Yeah, maybe I should have put IIRI (if I recall incorrectly)

 

1st option is a leaking dump valve.

2nd option is a failed VSS.

3rd option is a laeking inlet gasket.

4th option is a failing AFM.

5th option is a fault in the ecu.

continue in this fashion till doomsday... lol

 

cheers stu