Umm, is this what I think it might be..... ?
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From: Peter Spikings on 1 Sep 2007 14:54 On Sat, 01 Sep 2007 19:32:58 +0100, moray wrote: > Doki's hit the nail on the head. > Most likely just condensation that's never really made it out the engine, as > a side effect of the overcooling. OK... that seems like a reasonable explanation - there was no mayo in the expansion tank either. Thanks all. Anyone want to have a crack at the other half of my query? :) Thanks, Peter.
From: moray on 1 Sep 2007 15:10 "Peter Spikings" <peter(a)spikings.com> wrote in message news:newscache$6udpnj$1kl$1(a)news.powernet.co.uk... > On Sat, 01 Sep 2007 19:32:58 +0100, moray wrote: > >> Doki's hit the nail on the head. >> Most likely just condensation that's never really made it out the engine, >> as >> a side effect of the overcooling. > > OK... that seems like a reasonable explanation - there was no mayo in the > expansion tank either. Thanks all. > > Anyone want to have a crack at the other half of my query? :) Ah yes, that part of the query. Those pics are of the EGR valve. These engines don't have a IACV as such. They've got a stepper motor built into the throttle body to operate the main throttle valve, as they're fly-by-wire, and it also gets used to control idle speed (no point having two valves when one will do) Cleaning the main butterfly valve can work temporarily, but with varying degrees of success. Sometimes it'll improve things, sometimes no diference, and sometimes make it worse. Best option is replacement.
From: Peter Spikings on 1 Sep 2007 15:37 On Sat, 01 Sep 2007 20:10:39 +0100, moray wrote: > "Peter Spikings" <peter(a)spikings.com> wrote in message > news:newscache$6udpnj$1kl$1(a)news.powernet.co.uk... >> On Sat, 01 Sep 2007 19:32:58 +0100, moray wrote: >> >>> Doki's hit the nail on the head. >>> Most likely just condensation that's never really made it out the engine, >>> as >>> a side effect of the overcooling. >> >> OK... that seems like a reasonable explanation - there was no mayo in the >> expansion tank either. Thanks all. >> >> Anyone want to have a crack at the other half of my query? :) > > Ah yes, that part of the query. > > Those pics are of the EGR valve. > > These engines don't have a IACV as such. They've got a stepper motor built > into the throttle body to operate the main throttle valve, as they're > fly-by-wire, and it also gets used to control idle speed (no point having > two valves when one will do) > > Cleaning the main butterfly valve can work temporarily, but with varying > degrees of success. > Sometimes it'll improve things, sometimes no diference, and sometimes make > it worse. > > Best option is replacement. Great stuff... I tried to find the throttle body but couldn't, I also couldn't see the accelerator cable. I assumed this meant that I'd need to get under the car to find them - but knowing now that it's fly-by-wire explains the lack of cable :) Where is it and is it just the motor that needs replacing? Thanks, Peter.
From: Harry Bloomfield on 1 Sep 2007 15:44 Peter Spikings presented the following explanation : > Hi, > Astra 1.6 8v 51 reg belonging to friend. > Spotted what looks like mayo in the oil, the oil filler cap is a bit out > of focus but is covered in it. No sign of mayo on the dipstick but I guess > you wouldn't see it there anyway :) That mayo does not look like enough to account for the amount of water being lost from the cooling system, so the HG might be OK after all. It is more what I would expect of an engine never getting properly up to temperature -as in short runs, or the thermostat stuck open. Fit a new stat and I'll bet the mayo soon disappears. For the water leak you might try looking for it with the engine running - check especially around the water pump shaft, which can hide such leaks. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk
From: moray on 1 Sep 2007 15:47
"Peter Spikings" <peter(a)spikings.com> wrote in message news:newscache$cufpnj$1kl$1(a)news.powernet.co.uk... > On Sat, 01 Sep 2007 20:10:39 +0100, moray wrote: > >> "Peter Spikings" <peter(a)spikings.com> wrote in message >> news:newscache$6udpnj$1kl$1(a)news.powernet.co.uk... >>> On Sat, 01 Sep 2007 19:32:58 +0100, moray wrote: >>> >>>> Doki's hit the nail on the head. >>>> Most likely just condensation that's never really made it out the >>>> engine, >>>> as >>>> a side effect of the overcooling. >>> >>> OK... that seems like a reasonable explanation - there was no mayo in >>> the >>> expansion tank either. Thanks all. >>> >>> Anyone want to have a crack at the other half of my query? :) >> >> Ah yes, that part of the query. >> >> Those pics are of the EGR valve. >> >> These engines don't have a IACV as such. They've got a stepper motor >> built >> into the throttle body to operate the main throttle valve, as they're >> fly-by-wire, and it also gets used to control idle speed (no point having >> two valves when one will do) >> >> Cleaning the main butterfly valve can work temporarily, but with varying >> degrees of success. >> Sometimes it'll improve things, sometimes no diference, and sometimes >> make >> it worse. >> >> Best option is replacement. > > Great stuff... I tried to find the throttle body but couldn't, I also > couldn't see the accelerator cable. I assumed this meant that I'd need to > get under the car to find them - but knowing now that it's fly-by-wire > explains the lack of cable :) Where is it and is it just the motor that > needs replacing? It's the bit sandwiched between the black inlet hose on the left of the pics, and the inlet manifold, with various hoses going onto it. Got to be replaced as a complete unit (the stepper motor is built in the crimped bit at the rear of the throttle body). |