low on performance and high idle

g40Ross · May 05, 2010, 05:16:42 PM

hey guys had my G40 a few weeks now and it seems it doesnt pull as hard as it did in the first few days of having it! i am currently running on ordinary unleaded could that have something to do with it?

also my car idles pretty high sometimes and i read some were about removing the idle control sensor and giving it a clean may stop this! but then iv also been told it could be the blue temp sensor? can some one send me some pics of were the idle control sensor and blue temp sensor are so i can try them both!

all help will be really appreciated!

cheers

Ross

vwmk3jon · May 05, 2010, 05:42:53 PM

the idle control valve is under the inlet manifold behind the head. pipe going in either side and a plug.

The blue temp sensor is on the ride hand side of the head as you look at the engine. 2 plugs - 1 black 1 blue. New sonsors roughly £7 from gsf.

g40Ross · May 05, 2010, 06:16:18 PM

does that mean removing the inlet manifold to get to the sensor?

vwmk3jon · May 05, 2010, 06:30:18 PM

Easier if you do although its still possible to get at with the inlet in place but it can be fiddly.

g40Ross · May 05, 2010, 06:56:35 PM

its running pretty rich tooo any ideas with that?

hardchargin40 · May 05, 2010, 07:11:36 PM

probably blue CTS again, replace them first as fairly cheap and worth doing anyway then see whats going on. Also, as has been said, check ISV connector clean and ISV itself working ok (carb cleaner) and check CO Pot set to 550ohms.

youngprodigys · May 05, 2010, 07:24:30 PM

get a blue temp sensor from vag mate - the GSF ones are shit and known for being a common failure. i bought one once just to get my car running and it didnt even fit in the coolent housing!!! CHEAP SHITE!

also - check for vacuum leaks- you may have created one after giving it a lot of beans

vwmk3jon · May 05, 2010, 07:35:52 PM

GSF blue temp sensors really that shite? I got mine from gsf and it fit ok. Dunno if its dodgy though!

youngprodigys · May 05, 2010, 07:40:14 PM

they just dont last mate!
they are really are not very good at all and im sure a lot of people will back me up on this.

samg40 · May 05, 2010, 07:41:47 PM

If its idling high have you tried adjusting the idle screw on the throttle body?

g40Ross · May 05, 2010, 10:36:48 PM

i havnt tried the idle screw on the throttle body no! but i dont think it will be that as it doesnt always do it just some time when i pull up at a junction or something!

g40Ross · May 05, 2010, 10:39:58 PM

Quote from: youngprodigys on May 05, 2010, 07:24:30 PM
get a blue temp sensor from vag mate - the GSF ones are shit and known for being a common failure. i bought one once just to get my car running and it didnt even fit in the coolent housing!!! CHEAP SHITE!

also - check for vacuum leaks- you may have created one after giving it a lot of beans

were would i find vacuum leaks? ive just also noticed ive got a bit of an oil leak!

grayg40 · May 06, 2010, 10:10:56 AM

where abouts the oil coming from? top or bottom

g40Ross · May 06, 2010, 04:57:48 PM

Quote from: grayg40 on May 06, 2010, 10:10:56 AM
where abouts the oil coming from? top or bottom

bottom from the left of the oil filter it looks like but havent had chance to have a proper look need to get it up on axel stands!

g40Ross · May 18, 2010, 06:38:31 PM

oil leak fixed! replaced blue temp sensor, still idles high every now and then! went to my local vw dealers today to get an idle control valve sensor n they wasnt sure what i was talking about so have been asked to go in so they can have a look and see where it is! any one give me the correct term for this idle control valve sensor? or a part number?

cheers

Ross