Mk4 1.8Gti starting problems & high idle revs

[jroberts060]

Hi,
i've got a 2000 X plate gti 1.8t 150bhp with 110k on the clock. it's been really reliable for 4 years but recently has problems starting: basically -

• sometimes (prob 70% of the time) it starts fine, like new, no accelerator needed to start
• other times, it will take 5-10 seconds to start, and only if i pump the accelerator pedal hard. In these cases, when it starts the engine seems to vibrate a lot and some dark smoke comes out of the exhaust temporarily, then it;s ok
• sometimes when it is idleing after starting the engine, it will idle at around 2500 revs, rather than usually just under 1000.
• it doesn't seem to make any difference whether the engine is hot or cold. if anything, it normally starts fine, first time each morning. then when i restart it during the day i have the problems.

any thoughts? all ideas appreciated and anything that i could try myself rather than having to take to a mechanic would be great.

thanks in advance
John

[18turbo]

Hi,
i've got a 2000 X plate gti 1.8t 150bhp with 110k on the clock. it's been really reliable for 4 years but recently has problems starting: basically -

• sometimes (prob 70% of the time) it starts fine, like new, no accelerator needed to start
• other times, it will take 5-10 seconds to start, and only if i pump the accelerator pedal hard. In these cases, when it starts the engine seems to vibrate a lot and some dark smoke comes out of the exhaust temporarily, then it;s ok
• sometimes when it is idleing after starting the engine, it will idle at around 2500 revs, rather than usually just under 1000.
• it doesn't seem to make any difference whether the engine is hot or cold. if anything, it normally starts fine, first time each morning. then when i restart it during the day i have the problems.

any thoughts? all ideas appreciated and anything that i could try myself rather than having to take to a mechanic would be great.

thanks in advance
John

hi m8 hav u got vagcom if not i hav where do you live when was the lst time you serviced her,

[Crasher]

You need a fault code read and that will more than likely show you have a faulty coolant temperature sender.

[18turbo]

You need a fault code read and that will more than likely show you have a faulty coolant temperature sender.

its not ur temp senor m8 i had a dodgey temp senor and my car was not doin what urs is somthink else wrong there m8

[Crasher]

So it isn't what I might think it may be but it is something else, very helpful!

This post may also be of interest.


https://www.vwaudiforum.co.uk/forum/s...ght=text+speak

[slim1986]

its not ur temp senor m8 i had a dodgey temp senor and my car was not doin what urs is somthink else wrong there m8

id say new temp sender,i had a similar fault and that is what it turned out to be,plus id listen to crasher the bloke knows all!