Over-run

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SCOTMCDOT
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Over-run

Post by SCOTMCDOT » Tue Apr 07, 2009 12:30 pm

Where i have started driving my Rocco again recently i have noticed that i am sometimes getting a small amount of over-run when i switch off the engine.

What causes this?


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wasted
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Re: Over-run

Post by wasted » Tue Apr 07, 2009 1:37 pm

A number of things can cause this - but commonly caused by leaky injectors.


'89 Scala 1.8i - Daily drive, Work in progress!

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SCOTMCDOT
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Re: Over-run

Post by SCOTMCDOT » Tue Apr 07, 2009 6:58 pm

Mines a carb, possibly a carb problem?


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richlyons
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Re: Over-run

Post by richlyons » Tue Apr 07, 2009 8:29 pm

mine does the same thing, get rid of the carb and go for a webber :hugegrin:
could be the dizzy timing? not sure on that though, it only what i got told.


1988 helios blue scala, weber carb, gti cam,
1989 red gt2 (daily)

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wasted
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Re: Over-run

Post by wasted » Tue Apr 07, 2009 10:55 pm

Not sure on the dizzy timing... Don't see how that could cause overrun really, it should be a fuelling issue. If yours is a carb, I couldn't give you a decent answer I'm afraid... Perhaps an over-rich mixture?


'89 Scala 1.8i - Daily drive, Work in progress!

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richlyons
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Re: Over-run

Post by richlyons » Wed Apr 08, 2009 11:27 am

i didnt see what the dizzy would do either :dunno:
but a guy from vw told me, he also order the wrong part 2 times :(


1988 helios blue scala, weber carb, gti cam,
1989 red gt2 (daily)

KindredSpirit

Re: Over-run

Post by KindredSpirit » Wed Apr 15, 2009 5:19 pm

Can be caused by incorrect timing, or a build up of carbon on the tops of the pistons, requiring a 'decoke'. this causes the hot carbon on the pistons to carry on firing the fuel, but that doesn't happen very often these days with improved fuel.
Sorry - showing my age. :cry:
Cheers
John



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SCOTMCDOT
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Re: Over-run

Post by SCOTMCDOT » Mon Apr 20, 2009 5:51 pm

Will get it tuned then. Have noticed it pinking a bit in the last few days too :roll: so its pointing in that direction.


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