MK5 Golf GTI

All Things Mk5 => Modifications & Technical Area => Technical Workshop => Topic started by: N13SCB on January 03, 2012, 04:49:24 pm

Title: Symptoms of faulty MAF?
Post by: N13SCB on January 03, 2012, 04:49:24 pm

I have a rough idea that this is a problem im having with my car, its a 2006 gti.

What would be the symptoms I would be seeing if this was my problem?

Thanks, Stu  :happy2:

Title: Re: Symptoms of faulty MAF?
Post by: bacillus on January 03, 2012, 07:45:49 pm

Disconnect the maf connector. If your idling improves then it's suggestive of a failing/dirty maf.

Title: Re: Symptoms of faulty MAF?
Post by: andrewparker on January 03, 2012, 08:07:35 pm

Is the MAF something that is likely to fail with age, or should it never need replacing?

Title: Re: Symptoms of faulty MAF?
Post by: andrewparker on January 03, 2012, 08:10:04 pm

Quote from: bacillus on January 03, 2012, 07:45:49 pm

Disconnect the maf connector. If your idling improves then it's suggestive of a failing/dirty maf.

Won't the car throw up a fault light on the dash though?

Title: Re: Symptoms of faulty MAF?
Post by: bacillus on January 03, 2012, 09:37:57 pm

It may but once you reconnect the maf and do a few ignition starts it should disappear.

Title: Re: Symptoms of faulty MAF?
Post by: N13SCB on January 04, 2012, 12:41:41 pm

Thanks,

The reason I asked was my car seems flat through the rev range, everything else seems to check out fine and one of the things I havent changed is the MAF.

A while ago I done the check when I disconnected it from the car and took it for a run and it made no difference at all. Would this tell me mine has had its day?

Thanks again,

Stu.

Title: Re: Symptoms of faulty MAF?
Post by: bacillus on January 04, 2012, 03:47:53 pm

Quote from: N13SCB on January 04, 2012, 12:41:41 pm

A while ago I done the check when I disconnected it from the car and took it for a run and it made no difference at all. Would this tell me mine has had its day?

Sounds like your issue lies elsewhere...

Have you checked your DV as it may be leaking/torn if it isn't the latest D version?

Title: Re: Symptoms of faulty MAF?
Post by: N13SCB on January 04, 2012, 06:41:03 pm

Yeah that has already been changed, the n75 valve has been changed and a boost gauge has been plumbed in which shows no leaks.

I had just been advised from two machanics that my MAF is where the problem could be  :stupid:

Thanks, Stu.

Title: Re: Symptoms of faulty MAF?
Post by: andrewparker on January 04, 2012, 06:52:45 pm

PCV?

Title: Re: Symptoms of faulty MAF?
Post by: N13SCB on January 04, 2012, 10:08:02 pm

Quote from: andrewparker on January 04, 2012, 06:52:45 pm

PCV?

Would there be anything I should be looking out for if this is whats broken?

Title: Re: Symptoms of faulty MAF?
Post by: andrewparker on January 04, 2012, 10:13:20 pm

A faulty one results in a rough idle and over-revving. It's a common problem but fortunately doesn't cost much to replace.

Title: Re: Symptoms of faulty MAF?
Post by: N13SCB on January 05, 2012, 11:08:28 am

I have done internet checks about symptoms of a failing pcv and it does sound along the right lines, would this cause a noticeable block/leak of boost?

Im sure my boost guage was plumbed in just before the pcv and up to there the car was consistently making 16psi with no leaking, spiking etc....

Thanks for the help,

Stu.

Title: Re: Symptoms of faulty MAF?
Post by: paulgrant on January 05, 2012, 05:17:37 pm

so if after unplugging the MAF there is better performance does that = a bad MAF?

Title: Re: Symptoms of faulty MAF?
Post by: bacillus on January 05, 2012, 06:06:31 pm

Quote from: paulgrant on January 05, 2012, 05:17:37 pm

so if after unplugging the MAF there is better performance does that = a bad MAF?

pretty much...

Title: Re: Symptoms of faulty MAF?
Post by: paulgrant on January 05, 2012, 06:30:13 pm

thanks mate now i know where my powers been hiding ! best get a new one ordered i think