1994 Pontiac Bonneville scan tool makes car run

Tiny
LYNDAB2
  • MEMBER
  • 1994 PONTIAC BONNEVILLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 234,345 MILES
I am wondering if any one has come into the problem I am having. When I plug the scan tool in the car it idles correct when I unplug scantool from the car, the car returns to the high idol condition i`m trying to diognose. The scaner give no codes. But the car returns to a high idle of 2400 rpms. Same rpm as before scanning. Could my scantools batteries be an acting ground for pcm, or what.
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Saturday, April 5th, 2008 AT 5:02 PM

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Tiny
MUNKIEBOY
  • MEMBER
All I know is that my '94 Bonneville has the OBDII connector but runs the OBDI system. You're probably just accidentally bypassing whatever codes you have while the tool jumps terminals. If yours is like mine you will not see any codes on an OBDII scan tool. If I'm wrong someone please let me know, I just want to read my codes, too!

Finally, someone feels my pain :b

munkie
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Friday, June 13th, 2008 AT 5:56 AM

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