08-06-2012, 05:26 PM
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#1
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98 Arctic silver 986
Join Date: Jul 2011
Location: Upstate, NY
Posts: 1,452
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No i don't have a CEL. I used an Actron scanner and found no pending codes. I have a hesitation at full throttle over 5,000 RPM's. I had another thread on the site about it. I have changed the plugs, fuel filter and air filter. It has not improved. I figured it was free to disconnect the MAF to see if it made any improvements. I just don't want to leave it disconnected for too long and have it cause any damage to anything else. Cats, O2 sensors or anything.
Last edited by tommy583; 08-06-2012 at 05:30 PM.
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08-06-2012, 05:54 PM
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#2
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Registered User
Join Date: Nov 2008
Location: Massachusetts
Posts: 4,810
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Quote:
Originally Posted by tommy583
No i don't have a CEL. I used an Actron scanner and found no pending codes. I have a hesitation at full throttle over 5,000 RPM's. I had another thread on the site about it. I have changed the plugs, fuel filter and air filter. It has not improved. I figured it was free to disconnect the MAF to see if it made any improvements. I just don't want to leave it disconnected for too long and have it cause any damage to anything else. Cats, O2 sensors or anything.
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Most will agree, that disconnecting the maf for a brief ride is a safe and effective way to rule out the sensor as being the culprit. Provided, however, that it is in fact the sensor that's causing the problem .
__________________
Don't worry … I've got the microfilm.
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08-06-2012, 06:13 PM
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#3
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98 Arctic silver 986
Join Date: Jul 2011
Location: Upstate, NY
Posts: 1,452
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Well I'm at work. I disconnected it. I now have a 14 mile ride home. I guess i'll see if it helps or not. I'll post back when i hopefully arrive safely at home around 12am EST.
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08-06-2012, 07:15 PM
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#4
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98 Arctic silver 986
Join Date: Jul 2011
Location: Upstate, NY
Posts: 1,452
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Well I left work a little early. My findings were: On the positive side dead solid idle. It fluctuated a little before. Pulls strong to 6,500 RPM full throttle.
On the negative side, I got a CEL with in the first mile after i started it.
So at this point i will hook it back up, read the code and then clear the code. I already had the MAF out of the car a few weeks ago. It looked brand new, but i cleaned it with CRC MAF cleaner anyway.
So what do you guys and gals think?
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08-06-2012, 09:47 PM
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#5
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Registered User
Join Date: Nov 2008
Location: Massachusetts
Posts: 4,810
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The CEL is likely the result of pulling the sensor. The code that will probably appear is P0102 . Many have reported having a failing maf sensor without it necessarily causing a CEL.
__________________
Don't worry … I've got the microfilm.
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08-07-2012, 06:14 AM
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#6
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Tommy,
When you disconnect the MAF your DME will light a CEL and revert to default fuel trims. If the car runs better you know you have a failing MAF that was sending faulty info to the DME. If the car runs no better or worse, your test was inconclusive.
This is a simple test anyone can do that will not harm your car as long as you don't have something else seriously wrong. The process of elimination works.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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08-07-2012, 12:48 PM
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#7
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98 Arctic silver 986
Join Date: Jul 2011
Location: Upstate, NY
Posts: 1,452
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The codes I had were P0102 and P0112. I cleared the codes and hooked the MAF back up. No codes on my way to work. I cleaned the MAF a few weeks ago, it didn't show any improvement. But it seemed to run quite a bit stronger with it disconnected. So i guess my next purchase will be a new MAF.
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1998 Porsche 986
Dangermobile
Lil Red
2009 Porsche Cayman 2.9L
Hybrid Mode
