Sorry.
big boys sauna
Guest
hi im still about sold the car long time back but know quite abit on these now as worked on quite a few.
what happens is in the throttle housing it gets a carbon build up between the housing and the throttle flap thus it stops the flap shutting propley letting more air in on idle creating rough idle as theres more air than fuel goin in the engine so see below on how to sort..
what you need to do is first disconnect the battery then take the inlet pipe off at the throttle body housing and you will see the throttle flap, get some carb cleaner and clean the flap and the throttle body housing you will see the carbon build up (black) when you open the flap,just push the flap down and clean around it until all the black is gone. refit the inlet pipe and reconnect the battery then straight away turn on the ignition and leave on for 2 mins this should reset the throttle housing. it may take a little to start due to carb cleaner in the cylinders.if that doesnt work you will need to have it plugged in and a functional test run which will reset the housing to manufactor spec.
if both the above doesnt work you will be looking at a new housing but i havnt had that yet.
hope you sort it cheers dave
So where does this carbon come from?
I've seen many posts now about cleaning the throttle body, but it hadn't occurred to me to wonder, where does this carbon come from? There should only be clean air in the inlet charge at the throttle body, fuel is injected at the inlet valve.
Is this the petrol engine manifestation of the EGR contamination issue that afflicts diesels?
The crankcase breather will put oily vapours into the inlet, but that shouldn't be getting hot enough to carbonise at the throttle body. Non-turbo cars have EGR that puts exhaust gas into the throttle body - so is this where the carbon is coming from?
I have a diesel, so I wouldn't know . . .
I've seen many posts now about cleaning the throttle body, but it hadn't occurred to me to wonder, where does this carbon come from? There should only be clean air in the inlet charge at the throttle body, fuel is injected at the inlet valve.
Is this the petrol engine manifestation of the EGR contamination issue that afflicts diesels?
The crankcase breather will put oily vapours into the inlet, but that shouldn't be getting hot enough to carbonise at the throttle body. Non-turbo cars have EGR that puts exhaust gas into the throttle body - so is this where the carbon is coming from?
I have a diesel, so I wouldn't know . . .
titch5777
Guest
Hi
Thanks for the help, the car seems to still not be right tho.
It seems to lose power when trying to pull away either from the driveway or at a junction,traffic lights etc, i put my foot down but doesnt seem to be anything there, then all of a sudden it will come back to normalwith loads of power! VERY STRANGE.
Also when sat still with the engine on, the revs go from 800, right down to about 400 then right up over 1000 revs by itself.
Again tho it doesnt do it everyday just now and again!
We have had the lambda sensor, maf sensor, O2 sensor and air filter all changed, and have cleaned out the throttle body!
I would be very greatful for any other ideas!
thanks
Thanks for the help, the car seems to still not be right tho.
It seems to lose power when trying to pull away either from the driveway or at a junction,traffic lights etc, i put my foot down but doesnt seem to be anything there, then all of a sudden it will come back to normalwith loads of power! VERY STRANGE.
Also when sat still with the engine on, the revs go from 800, right down to about 400 then right up over 1000 revs by itself.
Again tho it doesnt do it everyday just now and again!
We have had the lambda sensor, maf sensor, O2 sensor and air filter all changed, and have cleaned out the throttle body!
I would be very greatful for any other ideas!
thanks
big boys sauna
Guest
new throttle body mate is where i would be goin next,you can get a pattern one from your local car spares place dont go dealer as will be very expensive cheers slate
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