Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 09-03-2017, 04:55 PM   #1
Registered User
 
Join Date: Sep 2011
Location: Reno, NV
Posts: 148
P1508 & limp mode

Having an issue with car going into limp mode on way to Thunderhill Friday. After about 3 hours into trip to Willows Ca from Reno, in 100 degree air temps car goes into limp mode at low speed after left turn. Pull over, cycle ignition off and restart car all is well again. About 10 minutes later making a right turn onto I-5 on ramp, happens again. Very hot weather, but car temps are normal for conditions including oil temp and oil pressure reading from added gauges. About 190 on water & 210 on oil. Continuing on happens again rolling down the freeway in a straight line this time at speed. Cycle key and carry on to hotel. Thinking this must be the 105 plus air temps and hotter asphalt having some affect.

Next day at the track car seems fine until 3/4 way around first lap after right turn. Same thing again. Restart car and exit track, go straight to BR racing tent.
After a proper scan code P1508 is read "Function monitoring Torque comparison"
It was suggested that the MAF was at fault, or the DME.

Never once did I see a check engine light, including the trip home after not returning to track. Multiple times this happened on the trip home, primarily after exiting a right hand curve and 2 plus hours into the trip.

2002 Boxster S with Cayman S air box & tbi, softronic tune. Been running this setup for several years with no issues.

Drove it again today after checking for any obstruction up to MAF. Cleaned and reinstalled. Much cooler at home today, still hot at 95. Somewhat lesser of any issue after every right hand turn again. Not full limp mode this time.

Any thought on where to look?
onaFLYer is offline   Reply With Quote
Old 09-03-2017, 05:26 PM   #2
Registered User
 
The Radium King's Avatar
 
Join Date: Apr 2010
Location: Canada
Posts: 2,923
i'd say maf - probably the intake air temp sensor gone out of spec.
The Radium King is offline   Reply With Quote
Old 09-03-2017, 05:33 PM   #3
Registered User
 
Join Date: Sep 2011
Location: Reno, NV
Posts: 148
I have Durametric. Is there a number at idle or other I should look for?
onaFLYer is offline   Reply With Quote
Old 09-03-2017, 05:38 PM   #4
Registered User
 
The Radium King's Avatar
 
Join Date: Apr 2010
Location: Canada
Posts: 2,923
no idea. i presume that the durametric provides iat info, but uncertain what format - temp, volts, %, ?
The Radium King is offline   Reply With Quote
Old 09-09-2017, 03:40 PM   #5
Registered User
 
Join Date: Sep 2011
Location: Reno, NV
Posts: 148
No more limp mode

Changed the maf, and it's a little better now. No more limp mode but still stumbles big time on accel. Primarily out of RH turns but not exclusively.

Unplugged the maf and same issue. Still no check engine light which seems odd.
onaFLYer is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 04:39 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page