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

Reply
 
LinkBack Thread Tools Display Modes
Old 08-23-2018, 06:56 AM   #1
Registered User
 
Join Date: Oct 2009
Location: London, England
Posts: 8
OBD II Analysis? Live Data...

Hey guys, is anyone able to understand/analyse OBD II data?

I've replaced the MAF sensor in my car and it seems to be performing a lot better than before, but I'm still getting a check engine light in the dash (but no fault codes) and there still seems to be a slight idle problem...

And to my completely non mechanic trained mind, it seems to smell quite fuely/petroly (technical term lol)


Quote:
Fuel system 1 status --- OL-Drive
Fuel system 2 status --- CL
Calculated LOAD Value --- 0.8%
Engine Coolant Temperature --- 87C
Short Term Fuel Trim - Bank 1 --- 0.0%
Long Term Fuel Trim - Bank 1 --- 32.0%
Short Term Fuel Trim - Bank 2 --- 0.0%
Long Term Fuel Trim - Bank 2 --- 32.0%
Engine RPM --- 904/min
Vehicle Speed --- 0mph
Ignition Timing Advance for #1 Cylinder --- 4.0
Intake Air Temperature --- 50C
Air Flow Rate from Mass Air Flow Sensor --- 0.4lb/min
Absolute Throttle Position --- 0.0%
Commanded Secondary Air Status --- OFF
Oxygen Sensor Output Voltage (B1-S1) --- 0.060V
Short Term Fuel Trim (B1-S1) --- 0.0%
Oxygen Sensor Output Voltage (B1-S2) --- 0.435V
Short Term Fuel Trim (B1-S2) --- 99.2%
Oxygen Sensor Output Voltage (B2-S1) --- 0.245V
Short Term Fuel Trim (B2-S1) --- 0.0%
Oxygen Sensor Output Voltage (B2-S2) --- 0.435V
Short Term Fuel Trim (B2-S2) --- 99.2%
Any ideas?

Thanks! ����
Dan Mumford is offline   Reply With Quote
Old 08-23-2018, 07:16 AM   #2
Registered User
 
oldskool73's Avatar
 
Join Date: May 2015
Location: Sydney, Australia
Posts: 335
Your long term fuel trims are way out of wack, they should be no more than about +/-10. Mine were up around 27 and replacing the MAF fixed mine.

If you've not already, you might want to try disconnecting the battery for a while so the old LTFT is lost, then taking it out on a decent length trip. The LTFT won't start to adjust until it's warmed up, but may then come down to a normal range.

If not, you've got something else wrong ... https://www.autoserviceprofessional.com/article/94982/Fuel-trim-How-it-works-and-how-to-make-it-work-for-you?Page=2
oldskool73 is offline   Reply With Quote
Old 08-23-2018, 08:44 AM   #3
Registered User
 
BYprodriver's Avatar
 
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,214
Garage
Clogged, dripping fuel injectors ? Add a bottle of techron additive while filling tank with Chevron Supreme. Hit the highway & maintain 3000+ rpm as long as you can.
__________________
2000 S Speed Yellow LN 3.6L cylinders & pistons, triple row IMSB upgrade, R&R connecting rods, billet tensioner paddle&,oilpump driveshaft.Heads rebuilt by F6I with new valves & springs.Cayman airbox & MAF housing, 996 intake plenum & 75mm T/B. Fabspeedsport converters &Dansk muffler
BYprodriver is offline   Reply With Quote
Old 08-26-2018, 06:18 AM   #4
Registered User
 
Join Date: Oct 2009
Location: London, England
Posts: 8
So I reset the ECU as suggested and then took the car for another drive, these are the live data results afterwards, the fuel trims seem to have adjusted a little bit but the bank 2 sensor 2 still seems high...

Dan Mumford 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 06:45 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