odd problem.... - Page 2 - 6SpeedOnline - Porsche Forum and Luxury Car Resource

Sep 23, 2016 | 08:30 PM

#16

markski@markskituning

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Quote:

Originally Posted by VGLNTE1

I noticed today its only reaching .8 and .9 bar. inconsistent. Looks like its a boost leak test for me tonight! uuuuuuuuuugh

Dont you have some unknown tune in there? if so, I would immediately address it... I think I mentioned that to you a year ago...
pressyre test sure.. maybe a mafless tune that would also tell you a lot about maf and intake...

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Sep 24, 2016 | 12:16 AM

#17

VGLNTE1

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Quote:

Originally Posted by MARKSKI@911tuning

I still don't know, but it's ran well (other then the codes) for 55000 miles.

Nov 17, 2016 | 08:26 PM

#18

xmaciek82x

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VGLNTE1, did you ever resolve this issue? I'm curious what the cause was.

I'm having the same issues right now. No boost leaks, two different tunes, and my boost is not very consistent. It was "stuck" at .5 for few pulls, then over boosted a lot and then everything went back to normal at 1.0 bars. Minutes later I was only boosting .8. Sounds like exactly what you been experiencing.

I'm leaning toward MAF sensor going out. Not really sure yet.

Nov 17, 2016 | 08:48 PM

#19

VGLNTE1

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Quote:

Originally Posted by xmaciek82x

not yet markski has been kind enough to help we out, but still looking for time both our schedules can work

Nov 17, 2016 | 09:13 PM

#20

xmaciek82x

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Gotcha. Have you been able to datalog your car? Did you replace MAF already or waiting for Markski to give you advice before you proceed.

Nov 17, 2016 | 09:55 PM

#21

nick49

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Quote:

Originally Posted by pwdrhound

I've always run the OEM Bosch MAF, the $200 version that comes in a Bosch box as opposed to the $800 Porsche box. Same part. My engine flows in excess of the MAF limit (1480 kg/hr if I recall) and the ecu uses an algorithm to allow it to operate beyond the limit. Again, I've never had any MAF issues but still keep a spare one in the tool box just in case. Murphy's law states that if you have a spare on hand, you'll never need it....

A few weeks ago I started to intermittently get the ABS/PSM amber warnings. Sometimes 10 minutes after driving. I'd stop, switch off the ignition and restart. Sometimes they would instantly reappear, sometimes not. 32XXX miles, stock motor. Sound like a MAF issue? Do you have the Bosch MAF P/N? TIA

Nov 17, 2016 | 10:20 PM

#22

xmaciek82x

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This should be the Bosch MAF sensor:

https://www.amazon.com/gp/product/B0...=ATVPDKIKX0DER

Nov 18, 2016 | 05:27 AM

#23

'02996ttx50

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that may be the bosch maf for the 986 boxster which is in fact the same part for our cars. however, going from memory here..

I've always used the bosch maf w part number ending in "124-00".

( just looked at that pic on the amazon listing, and it references BOTH part #'s so its correct. )

Nov 18, 2016 | 01:33 PM

#24

Jeanmarcboilard

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For all the talk and suspicion of bad MAFs, I don't recall too many people actually resolving their issues by replacing the MAF. It's always the first thing everyone checks but usually never the culprit. I've got 3 of them and they all work fine.
Unless you're using an oiled filter, that's a different story.

Nov 18, 2016 | 01:46 PM

#25

Jeanmarcboilard

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Quote:

Originally Posted by VGLNTE1

I was thinking that at first. Still stock turbos on 108000 miles. Car has seen a couple winters in Illinois...How did you find out it was the wastegate?

Use an air compressor with a pressure regulator on it and a fitting that you can put a small hose on. Disconnect the small boost hose on the wastgate actuator and attach the compressor hose to it. Slowly increase your line pressure until you see the wastegates rod moving. Should be around 0.6bar(8psi).