dirty idle control valve? or just throttle body in general?
i'd not be so sure on that tbh.. Do a cold test and then get it nice and hot, ideally the temp it starts being silly and then do another test, see if it changes. Things move around with heat cycles, it really could be early head gasket failure and if you keep going you'll get to doesnt work cold either.Bump.
car still not fixed. and i really dont know what to do next. seems a bit of a waste to check for compression considering the issue only happens when the engine is hot
Bump.
car still not fixed. and i really dont know what to do next. seems a bit of a waste to check for compression considering the issue only happens when the engine is hot
. So start with the easy/free things to check - compression, timing etc
there is some smoke coming from the back of the engine when hot. i am not sure if its a exaust leak, or just the oil burning (i dropped a fair bit in that area when topping upThe sensor on top of the cam cover is the knock sensor which protects against pre detonation I believe.
Timing would only be off if someone had adjusted or fitted a new timing belt incorectly. Or if the belt had jumped for some reason but fairly unlikely.
Check for leaks/cracks in the exhaust manifold or exhaust pipe before the lamda sensor. If oxygen is getting in then it can make the ecu deliver too much fuel. Faulty (pre cat) lambda sensor can also cause this symptom. Full throttle might make it go away for a minute but then it might stutter again when you are maitaining steady speed. I've had a Fiat with cracked exhaust manifold which became undrivable when hot due to cracked manifold - due to previous owner mistreatment... completely flooded itself.
Check for leaks in vacuum line to brake servo.
Compression test doesnt seem too bad, but how hot was the engine? Presume underside of oil cap is clean?
Have you tried swapping coil packs?
When it misbehaves, does it idle properly or not? If it does not, you can try unplugging each cylinder and see if it makes any difference to diagnose coil packs.
i was thinking from what you said that is possible. and a gasket only costs 7-10 quid. so theres one on the way here already.Potentially also bad gasket seal on the exhaust manifold could cause similar issue?
It's a 0.9 spi car.You might be able to hear or feel the exhaust leaking at the gasket if it's bad enough. If it's cracked them the crack might open up when it's hot.
I'd expect a crack would be caused by lack of exhaust mounts or support.
In my cars case It was a 16v Multipla and the manicat mount hadn't been re-fitted...
If you disconnect the lambda sensor does it make any difference? Is this an spi or mpi car?
If you disconnect the lambda then it would run a 'baseline' fuel map which should eliminate any false readings from the lambda sensor. As far as I understand...It's a 0.9 spi car.
I can disconnect the lambda easily, what kind of effect are you expecting from doing that?