GolfGTIforum.co.uk

Model specific boards => Golf mk4 => Topic started by: rench on 24 April 2012, 17:36

Title: Running to lean
Post by: rench on 24 April 2012, 17:36

Cars having some running problems, over last few days it's either all power there or not boosting up right, dv still comes in. Checked for boost leaks carnt find anything. Also engine light came on scanned it came up with system to lean? Any ideas?

Title: Re: Running problem
Post by: richw911 on 24 April 2012, 18:10

Whats the code?

Title: Re: Running problem
Post by: rench on 24 April 2012, 19:28

17536 system to lean, when I reset code engine light went and it's seems to drive fine again for now second time I've reset it in 2days.

Title: Re: Running problem
Post by: topher on 24 April 2012, 19:37

that one means its going lean under load.. which is always worrying. Basically your lambda sensors are telling the ECU you're not getting enough fuel. The ECU will try to compensate for it but will only go so far before putting you in limp mode to save the engine. Could be that the lambda sensor itself is giving false readings, but 9 times out of 10 this fault is down to a dodgy MAF sensor. You also have to consider that it could be a problem with the fuel delivery (weak pump, bad injector, blocked filter/lines etc..)

Title: Re: Running problem
Post by: rench on 24 April 2012, 19:46

Any way to test any of these? Wares best place to start?

Title: Re: Running problem
Post by: topher on 24 April 2012, 19:52

live data logging with vcds or similar. If you just have one of those hand held scanners you'll have to find someone nearby with the right kit.

Title: Re: Running problem
Post by: rench on 24 April 2012, 20:10

Will a good vag com not say what's causing the problem I only have a cheap eBay one.

Title: Re: Running problem
Post by: topher on 24 April 2012, 20:20

vcds = vag com diagnostic system :cool: im pretty sure the freeware version wont do data logging though

Title: Re: Running to lean
Post by: rench on 24 April 2012, 21:54

awww right, my mates got a good vag com hand held joby cost about £200 will that do the job or does it need one thats connected to laptop?

Title: Re: Running to lean
Post by: Wazzzer on 24 April 2012, 22:52

laptop really to do proper logs

Title: Re: Running to lean
Post by: AaronGS on 24 April 2012, 23:02

topher, what blocks would you suggest logging with vcds?

Title: Re: Running to lean
Post by: rench on 25 April 2012, 20:26

also mpg on comp seems to be pritty low, getting 26mpg max on a run doing 60mph tops.

Title: Re: Running to lean
Post by: topher on 25 April 2012, 20:35

Quote from: AaronGS on 24 April 2012, 23:02

topher, what blocks would you suggest logging with vcds?

031 is the one for requested vs actual lambda

Quote from: rench on 25 April 2012, 20:26

also mpg on comp seems to be pritty low, getting 26mpg max on a run doing 60mph tops.

another clue pointing towards MAF sensor there