James
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| posted on 31/1/10 at 02:03 AM |
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Tintop problem- Polo idle speed- help!
1 step forward, 2 steps back! 
Along with servicing my girlfriend's Polo today I decided to try and sort the way the idle would intermittently drop suddenly and the car would
cut out.
I spoke to a mechanic friend of mine who said it wouldn't be the TPS as I'd guessed but the throttle butterfly and mechanism would be
gunked up and brake/throttle cleaner etc. would sort it.
So I stripped all the airbox away, removed the throttle body and cleaned it up thoroughly.
Put the car back together and now, the idle is much higher than it should be (up to 2500rpm or so) but sometimes randomly lower.
Sometimes it idles at 1100rpm as opposed to the 750rpm or so it was before.
Also, when lifting off the throttle the revs drop slowly and by random amounts as opposed to 'snapping' straight down to idle.
I also changed the air filter and spark plugs.
Anyone got any ideas that could help would that be brilliant!
Thanks!
James
[Edited on 31/1/10 by James]
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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mangogrooveworkshop
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| posted on 31/1/10 at 02:23 AM |
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You havent got an airleak have you?
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Angel Acevedo
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| posted on 31/1/10 at 05:16 AM |
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maybe you messed up the AFM sensor while cleaning?
Beware of what you wish.. for it may come true....
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Danozeman
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| posted on 31/1/10 at 10:04 AM |
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Theyr very common to have a leak on the throttle body and cause alsorts of weirdness.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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Mark Allanson
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| posted on 31/1/10 at 10:21 AM |
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I have a 1.4 TC (75) golf, and this happens every 15k miles or so. It is a carbon buildup inside the throttle body, it blocks the tiny little bleed
holes which allow the airflow when the throttle is shut. I upsets all the sensors which get signals they are not expecting.
The cure is a few spanners, an old toothbrush and a big tin of carb cleaner and about 45mins of your day.
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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tegwin
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| posted on 31/1/10 at 11:28 AM |
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When we bought the 1.6GL 1995 the throttle was doing weird things, after a while it got so bad that the revs would just go up and down up and down by
about 3000 RPM... turned out the TPS in the throttle body was shot (a fairly common issue apparently)... got it replaced under waranty and the problem
went away..
[Edited on 31/1/10 by tegwin]
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Would the last person who leaves the country please switch off the lights and close the door!
www.verticalhorizonsmedia.tv
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James
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| posted on 31/1/10 at 10:31 PM |
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Woohoo!
Fixed! 
I stripped it all apart again. Spent a bit longer with the carb cleaner on the TB (and made sure the butterfly was spotless and in the right way round
(it was).
I even dismantled the throttle pot, saw a world of spring and gear related pain, checked the wire continuity and put that back together rather
quickly! 
I removed the TB gasket and cleaned it (should be replaced according to Haynes but it was still pretty 'rubbery' ) and cleaned the gunk
out of the grove the gasket sits in.
Started the engine and all was then ok.
I did up the TB more tightly (in case airleak around it) and then just put everything else back, one part at a time and started the ignition each time
to see if anything else caused the problem.
Nothing broke it again so I assume all is fixed.
I can only assume I'd not fitted the TB back properly when cleaning yesterday, the gasket was not sealing properly or maybe the butterfly had a
problem.
Thanks for the help everyone!
Cheers,
James
[Edited on 31/1/10 by James]
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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