mitsubishi charisma1.8gdi

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Mon 24 Apr 2006 21:46
mitsubishi charisma1.8gdi - zippy1006
My motors only 3 years old with 46k and it seems to be idling erratically and hanging when you depress the clutch. Now I?ve heard that these engines are prone to carbon build up due to our crappy fuel here in Britain. But it seems a really low mileage for that to happen anybody got any ideas or does this sound about right.
thanks!
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Mon 24 Apr 2006 21:49
mitsubishi charisma1.8gdi - Aprilia
Sounds right.
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Tue 25 Apr 2006 09:27
mitsubishi carisma 1.8 gdi - zippy1006
Are we talking a full de - coke job or is it worth trying anything else. I've ran an injector cleaner through it but it hasn't really made any difference. I'm thinking of changing the fuel filter (if i can find it).
thanks!

{Shouting - ie, typing soley in UPPER CASE amended for the 2nd time! And moved to existing question on the same subject. DD}
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Tue 25 Apr 2006 09:31
mitsubishi carisma 1.8 gdi - Aprilia
Try in-situ de-coke with crushed walnut shell blasting.
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Tue 25 Apr 2006 11:33
mitsubishi carisma 1.8 gdi - Altea Ego
A genuine question here out of pure interest.

If its done "in situ"
How do they ensure they get all the blasting agent (ie the crushed shells) out of the engine?
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TourVanMan TM < Ex RF >
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Tue 25 Apr 2006 13:21
mitsubishi carisma 1.8 gdi - Peter D
They are initially quite abbrasive and then they are combustable and turn to dust. Disconnecting the cat is a good idea. However the contamination may be purely that throttle body is due for a proper clean and set up. Another top end de-coke cleaner is to feed water into the inlet manifold after the AMM or MAF in a controlled method at 25cc per minute at 2500 rpm and the results are amazing particularly on older models if you have ever seen a head off after a head gasket failure your'll know how clean it will be. Regards Peter
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Tue 25 Apr 2006 13:56
mitsubishi carisma 1.8 gdi - Aprilia
Most problems with the GDi actually relate to coke in the throttle body. Putting stuff in via the injectors will not make any difference.
Ideall take off the inlet manifold and throttle body and strip and clean it with Mitsubishi's own decarbonising agent (can't remember the part no., but I've posted it before so do a search).

BBA-Reman sell rebuilt throttle bodies for about £500 if worst comes to worst!
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Tue 25 Apr 2006 20:47
mitsubishi carisma 1.8 gdi - zippy1006
sounds like a big job. Am i right. Ill get a quote from my local garage if it is. hopefully this is all it will take. thanks guys!
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Tue 25 Apr 2006 22:00
mitsubishi carisma 1.8 gdi - bikemade3
Try in-situ de-coke with crushed walnut shell blasting.


I have never seen this done on an internal combustion engine, however theory is exactly the same as the way we clean gas turbine engines before we resort to changing them.Done at night the visual effect is spectacular especially when you put 14 Lb down the intake. Very much a method of last resort, which normally justs the performance figures to pass.
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