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[Malcolm_D]

Before I changed the rocker seal on the left bank the car occasionally idled a bit up and down and stalled at lights quite often, when I put it back together the revs on idle went from 1200 to 2000 very rythmically! OK from cold but after 4/5 mins off it went. I couldn't sort it so off to the garage it goes, it has been there 5 weeks and they are stumped! It's not the ICV, the crank sensor, blocked breathers, leaking breathers or MAF sensor. So what the hell is it? Anyone got any bright ideas? It has been on a Tech 2 - this reported a faulty crank sensor but they have tried that with no joy. Please help, I am desperate! Is my next step to pay the garage bill and scrap the beast?

[feeutfo]

Not the icv? Explane?

And welcome by the way

[same #same#]

ive had a similer fault and it turn'd out to be the ecu temp switch had a fault so just changed it and worked fine after that cuts out the ecu thinking its been stud to long so was told by vx, but dont know about that, any way itstoped when it was changed.

[Malcolm_D]

ICV removed cleaned and lubricated with v. light oil, seal to plenum checked thoroughly. Garage checked it too and gave it the OK, tested by removing it with car running - problem still there. Should they have done anything else?

Thanks for the welcome and the suggestions.

When I last visited the garage to chat to Dave (the mechanic who is scratching his head - great bloke but severely puzzled) he mentioned that he was going to look at two temperature sensors next.

[Malcolm_D]

samesame - sounds worth a look where will I find the ecu temp switch?

[feeutfo]

ICV removed cleaned and lubricated with v. light oil, seal to plenum checked thoroughly. Garage checked it too and gave it the OK, tested by removing it with car running - problem still there. Should they have done anything else?

Thanks for the welcome and the suggestions.

When I last visited the garage to chat to Dave (the mechanic who is scratching his head - great bloke but severely puzzled) he mentioned that he was going to look at two temperature sensors next.

Ideally swap it for a known good one, where are you? Maybe someone can lend you there's.

Are there any chips in the valve edge making the valve stick for instance? It sounds iffy, mine took several cleans with carb cleaner before mine behaved on my old car.

[same #same#]

its in with the ecu attached to the ecu, some are on out side and some are in the ecu.

[Malcolm_D]

I am in York. To be honest the change between revs of 1200 and 2000 to me is too regular to be something mechanical like the valve edge in the ICV but I am willing to try anything. I will see if I can get hold of one.

[Malcolm_D]

samesame - thanks, I will tell Dave the mechanic so that he can have a look at it.

[same #same#]

its in with the ecu attached to the ecu, some are on out side and some are in the ecu.

another thing when it got hot outside 20+c it got worse, but in winter worked fine.

[feeutfo]

its in with the ecu attached to the ecu, some are on out side and some are in the ecu.

another thing when it got hot outside 20+c it got worse, but in winter worked fine.

Rusty are you comparing this v6 with a four pot?

[feeutfo]

I am in York. To be honest the change between revs of 1200 and 2000 to me is too regular to be something mechanical like the valve edge in the ICV but I am willing to try anything. I will see if I can get hold of one.

It's one of many places to look further IMO. Also retrace steps with the intake, check all the seals to plenum and manifold are seated correctly. Start with the easy stuff and go deeper.

[same #same#]

shuts down ecu turns off engine.no fault codes

[feeutfo]

Any experienced members near York could take a look at this one?

[karlc]

had similar problem on an astra ,it was the main earth wire at back of block for some reason it was giving strange signals to ecu when swapped all problems ceased best fiver i ever spent!