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Model specific boards => Golf mk4 => Topic started by: Dizzie on 24 March 2014, 12:23

Title: bad MPG after cam belt change
Post by: Dizzie on 24 March 2014, 12:23

The 150PD was overdue a cam belt change so I tackled that over the weekend.

I'd locked out the cam with the proper tool and made sure the crank was bang on the marks.

The drive to work usually reads 49-52mpg. This morning it was 41 :( The drive home is always 52-55mpg so I'll see what that gives me as I did do a fair bit of overtaking this morning and it was a bit colder also.

I'm wondering if the timing has moved from before as you have those 3 13mm's on the cam that can adjust the timing. I was pretty confident they were tightened the same as they were undone.

The power seems to be just as quick as before running a R-tech remap @ 185bhp/320ft/lb

Title: Re: bad MPG after cam belt change
Post by: XMC1980 on 24 March 2014, 18:02

Would it not be fair to say that wind conditions alone could effect this as it's only 8mpg? Just a thought

Title: Re: bad MPG after cam belt change
Post by: topher on 24 March 2014, 19:39

you need vagcom measuring block 004 for engine. the 4th field tells you if you need to adjust the cam sprocket.

Title: Re: bad MPG after cam belt change
Post by: Dizzie on 25 March 2014, 16:25

yeah I managed 49mpg on the way home compared to my usual 53-56mpg.

I moved the cam a fraction and got 51mpg on the way to work this morning.

Does the lite version of VDS do the measuring do you know? That's all I have

Title: Re: bad MPG after cam belt change
Post by: topher on 26 March 2014, 17:27

Not sure on that one I've never used vcds lite, think you might need the full version.

Title: Re: bad MPG after cam belt change
Post by: Bellend on 27 March 2014, 02:02

VCDS Lite does support measuring blocks but requires activation for most things.