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Model specific boards => Golf mk4 => Topic started by: stace110 on 15 November 2012, 16:33

Title: Coolant temp sensor probs
Post by: stace110 on 15 November 2012, 16:33

Hi all, iv'e just replaced the CTS and disconnected the battery to clear the code .....mpg has risen which is a good thing But .....now i have a bit of a lumpy idle ,like if i come to a junction it bounces then its fine ....Any ideas ?

Title: Re: Coolant temp sensor probs
Post by: topher on 15 November 2012, 16:36

could be a slight vacuum leak somewhere but a throttlebody clean is a good place to start. If you do a search you'll find a guide

Title: Re: Coolant temp sensor probs
Post by: stace110 on 15 November 2012, 16:50

The thing is ...it didnt do it until i changed the sensor and reset the ecu ....?

Title: Re: Coolant temp sensor probs
Post by: stace110 on 15 November 2012, 16:53

Also while im at it lol ..For some reason i have no power on the obd port i have to use a self powered code reader .....and i cant use my friends vag-com .....agu lump ....?

Title: Re: Coolant temp sensor probs
Post by: topher on 15 November 2012, 16:56

fuel trims get reset when you erase fault codes, and a non-reading temp sender will have been making your ECU do strange things with the fuelling.

Quote from: stace110 on 15 November 2012, 16:53

Also while im at it lol ..For some reason i have no power on the obd port i have to use a self powered code reader .....and i cant use my friends vag-com .....agu lump ....?

yeah AGU's are pre-OBD2 compliance so they don't have the 12v there, a genuine vagcom will work on it the ebay copies tend not to work too great on the AGU.

Title: Re: Coolant temp sensor probs
Post by: stace110 on 15 November 2012, 17:00

oh and any idea of the part number for the hose under the inlet manifold that goes to the pcv valve ....mine is split and knackered , Many thanks for the quick responce and answers .

Title: Re: Coolant temp sensor probs
Post by: Wazzzer on 15 November 2012, 18:15

That'll be your idle problem then

Title: Re: Coolant temp sensor probs
Post by: stace110 on 15 November 2012, 18:28

No ive bodged another pipe on for the moment but did that about a week ago so its not that ....

Title: Re: Coolant temp sensor probs
Post by: topher on 15 November 2012, 18:32

06A 103 221 C for the AGU. We usually keep a couple on the shelf they're very prone to splitting

Title: Re: Coolant temp sensor probs
Post by: stace110 on 15 November 2012, 18:46

Price ?

Title: Re: Coolant temp sensor probs
Post by: dan2252 on 15 November 2012, 18:49

i rekon taking the battery off hasnt helped it, mine idles low and then will idle high just after battery been took off you have to adapt the throttle body

Title: Re: Coolant temp sensor probs
Post by: stace110 on 15 November 2012, 19:13

I thought that was on cars with fly by wire throttle ? mine has a cable .

Title: Re: Coolant temp sensor probs
Post by: dan2252 on 18 November 2012, 23:16

So does my 1.8turbo but it ran crap before it got adapted

Title: Re: Coolant temp sensor probs
Post by: stace110 on 21 November 2012, 09:49

I take it i need to use Vag-com ....?

Title: Re: Coolant temp sensor probs
Post by: cullygti on 21 November 2012, 18:20

Quote from: dan2252 on 15 November 2012, 18:49

i rekon taking the battery off hasnt helped it, mine idles low and then will idle high just after battery been took off you have to adapt the throttle body

not on agu as it resetes itself within a few miles