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Unread 10-18-2013, 09:48 PM   #1
blue_xj_95
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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?

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Unread 10-19-2013, 03:40 PM   #2
psychoteen101
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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.
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Unread 10-21-2013, 08:43 PM   #3
blue_xj_95
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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 ?
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Unread 10-22-2013, 10:45 AM   #4
psychoteen101
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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.
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Unread 10-22-2013, 10:50 AM   #5
biffgnar
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Code doesn't seem consistent, but rough starting when the engine is warm is often heat soak.
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Unread 10-22-2013, 11:14 AM   #6
blue_xj_95
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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 ?
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Unread 10-22-2013, 11:17 AM   #7
psychoteen101
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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.
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Unread 10-22-2013, 11:19 AM   #8
biffgnar
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Hood vents help also
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Unread 10-22-2013, 01:15 PM   #9
blue_xj_95
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Alright well thanks for the help. It's appreciated.
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