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BigHank
GenIII
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12/29/2002
16:32:07

Subject: Anyone w/underdrive pulleys
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Message:
I installed a set of Jet UDP(smaller crank & alternator pulley set) on our '97 3.9 a few weeks ago.
They work great and can tell an improvement in performance--no real bad loss of alt output either--or at least that's what I thought.
Three days after installation I got a check engine light--only code that the odo would display is 12.
My question--has anyone else had a problem with UDP tripping the check engine light?


MoPar to Ya!!!

Jon
Dodge Dakota
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12/29/2002
16:42:43

RE: Anyone w/underdrive pulleys
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It probably wasn't caused by the underdrive pullies. I have the 3 pully set on my truck and with my stereo and fog lights and everything turned on the dash lights dim when i'm at a stop light and my voltage gauge goes down to about 10.5 volts but i haven't had any problems in the 8 months they've been on.

-Jon



BigHank
GenIII
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12/29/2002
22:14:00

RE: Anyone w/underdrive pulleys
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Yeah, that's what I thought--no way I could see them tripping a check engine. The 12 code is only a bat disconnect--no big deal.

I have reset the computer twice now and the check engine light still comes back on after a couple of days. I did notice that it seems to happen after I start up in the morning to let her warm up for about 15 min before I leave for work--on start no check engine light--after I come back ready to leave the light is on.

MoPar to Ya!!!

akaproph
Dodge Dakota
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12/30/2002
15:09:44

RE: Anyone w/underdrive pulleys
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Isnt it 0012 cause in the OBDII book its a "A Camshaft Position- Timing Over- Retarded (Bank 1)... Thats what the OBD II book says...



BigHank
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12/30/2002
17:06:45

RE: Anyone w/underdrive pulleys
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The way I got the code was from the odometer--key on-off-on-off-on--then the code 12 comes up.
According to the FSM that's only a battery disconnect. No big deal--shouldn't even trip a Check Engine light.

MoPar to Ya!!!

Daniel D
Dodge Dakota
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12/30/2002
19:51:01

RE: Anyone w/underdrive pulleys
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get someone to check it with a scan tool



akaproph
Dodge Dakota
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12/30/2002
20:06:35

RE: Anyone w/underdrive pulleys
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I know with the scan tool the code 12 is what I said before... dude go to autozone they check it for free there...



Dale
Dodge Dakota
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12/31/2002
09:37:00

RE: Anyone w/underdrive pulleys
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I just put the crank only pully on my truck. No problems other then it doens't like to jump start others.



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