Rough start when warm - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Rough start when warm

FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFlowmaster's Force II Axle-back exhaust system for the 201FS: Wranger BRIGHT License Plate LED! Just $3! Great value

Reply
Unread 10-18-2013, 09:48 PM   #1
blue_xj_95
Registered User
 
Join Date: Oct 2013
Posts: 5
Rough start when warm

I Have a 2001 Cherokee xj and I plugged in the obd 2 reader and I got the code p0103 and it comes up as Maf or vaf A circuit high input but I have no idea what vaf stands for. Could anyone help me out with that?

blue_xj_95 is offline   Reply With Quote
Unread 10-19-2013, 03:40 PM   #2
psychoteen101
Registered User
1996 XJ Cherokee 
 
Join Date: Feb 2010
Location: Gurnee
Posts: 661
vaf-Volume air flow.

What kind of code reader are you using? Id try and plug in a full on scan tool to check for codes because that code shouldnt come up on a cherokee.
__________________
1996 Jeep Cherokee- Project-- Rusty's 8in long arm, SYE kit, Teraflex driveshaft, Cragar soft 8's 15x10 with 33x12.5 Firestone Destination MT's, Eaton Tru Trac in the front
psychoteen101 is offline   Reply With Quote
Unread 10-21-2013, 08:43 PM   #3
blue_xj_95
Registered User
 
Join Date: Oct 2013
Posts: 5
I just have a standard obd2 code reader it's just a cheaper code reader. Do you think it could possibly be the MAT sensor ?
blue_xj_95 is offline   Reply With Quote
Unread 10-22-2013, 10:45 AM   #4
psychoteen101
Registered User
1996 XJ Cherokee 
 
Join Date: Feb 2010
Location: Gurnee
Posts: 661
Its a possibility i suppose. I would get a scan tool or bring it to a dealer and have them plug a factory tool into it and see what they come up with.
__________________
1996 Jeep Cherokee- Project-- Rusty's 8in long arm, SYE kit, Teraflex driveshaft, Cragar soft 8's 15x10 with 33x12.5 Firestone Destination MT's, Eaton Tru Trac in the front
psychoteen101 is offline   Reply With Quote
Unread 10-22-2013, 10:50 AM   #5
biffgnar
Web Wheeler
 
biffgnar's Avatar
2006 TJ Wrangler 
 
Join Date: May 2008
Location: Westchester, NY
Posts: 13,122
Code doesn't seem consistent, but rough starting when the engine is warm is often heat soak.
__________________
Thank you Dave Cole, Dynomax, Falken and all the Spec Class sponsors!!
biffgnar is online now   Reply With Quote
Unread 10-22-2013, 11:14 AM   #6
blue_xj_95
Registered User
 
Join Date: Oct 2013
Posts: 5
What could be the cause of heat soak and with the trmpurature rise do you think it could be messing with the water temp sensor ?
blue_xj_95 is offline   Reply With Quote
Unread 10-22-2013, 11:17 AM   #7
psychoteen101
Registered User
1996 XJ Cherokee 
 
Join Date: Feb 2010
Location: Gurnee
Posts: 661
The design of the manifold sucks. The heat from that side of the engine heat soaks the injectors and it will run rough. Typically you will get misfire codes with that. There are ways around it. I bought new injectors and wrapped them with heat shield tape. There are also heat shields available to help block the problem areas.
__________________
1996 Jeep Cherokee- Project-- Rusty's 8in long arm, SYE kit, Teraflex driveshaft, Cragar soft 8's 15x10 with 33x12.5 Firestone Destination MT's, Eaton Tru Trac in the front
psychoteen101 is offline   Reply With Quote
Unread 10-22-2013, 11:19 AM   #8
biffgnar
Web Wheeler
 
biffgnar's Avatar
2006 TJ Wrangler 
 
Join Date: May 2008
Location: Westchester, NY
Posts: 13,122
Hood vents help also
__________________
Thank you Dave Cole, Dynomax, Falken and all the Spec Class sponsors!!
biffgnar is online now   Reply With Quote
Unread 10-22-2013, 01:15 PM   #9
blue_xj_95
Registered User
 
Join Date: Oct 2013
Posts: 5
Alright well thanks for the help. It's appreciated.
blue_xj_95 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.