Mad Maf

Post by **yorkie** » Sat Jun 21, 2008 6:19 pm

Changed the air filter today, managed to lose somewhere in the depths of the engine bay one of the clips that holds the Maf in the airbox - good old tie wraps!

Had to virtually remove airbox to do up bottom clip, same as last time.

Anyway went out and did some logs to check everything was looking ok and recorded a peak maf of 232.06 - 290bhp???

Car as far as I know is std and spec boost vs actual was spot on.

Have I broken something?

Post by **tartan_rob** » Mon Jun 23, 2008 12:57 pm

Nope. Does sound like a stage1 witha dodgy DV valve...?

Post by **yorkie** » Mon Jun 23, 2008 5:44 pm

DV's were replaced with 710N's about a year ago.

Here is the offending log, at last managed to insert one so it doesn't look like Bingo numbers

Post by **tartan_rob** » Mon Jun 23, 2008 6:30 pm

It is either a stage1 running badly or a std car with N75 tweaked to max.

Post by **yorkie** » Mon Jun 23, 2008 8:07 pm

N75 was replaced same time as DV's, car has also been to Doug for a health check and once he had sorted out my dodgy N75 connections he didn't say he thought it was modded.

Post by **yorkie** » Tue Jun 24, 2008 6:21 pm

Also I would have expected the ecu to be calling for more boost than it does even if the turbos couldn't give it.

Post by **Doug_S2** » Tue Jun 24, 2008 11:18 pm

boost is stock. could be a leak causing more air to be sucked in. Could be maf reading wrong - they can read high as well as low.

Post by **mikeyquattro** » Wed Jun 25, 2008 8:34 am

Doug_S2 wrote:boost is stock. could be a leak causing more air to be sucked in. Could be maf reading wrong - they can read high as well as low.

My Maf was over reading.... IIRC it was 360ish. Should have been 325-330

Doug diagnosed and changed accordingly

Post by **yorkie** » Wed Jun 25, 2008 8:20 pm

Thanks all.

MAF is only about 14 months old but I guess that's no reason to think it may not be faulty.

Just seems odd that peak has only ever been 220 until I changed the air filter so maybe a leak due to my amateur mechanics

Had a poke around and the MAF housing wasn't pushed fully home into the airbox but everything else looked tight.

Won't be able to log again before the weekend.

Post by **tjd100** » Thu Jun 26, 2008 9:03 pm

I've got exactly the same problem (MAF peaks at 232) so please update if you ever find the cause. Like suggested I'm guessing air leak but damned if I can find it...

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