Question about 1994 Pontiac Bonneville
I have a '94 Pontiac Bonneville SE. The car starts and will sometimes idle (rough) and stall, Idle OK but after fluctuating throttle will maintain a high idle (About 3000 RPM manifolds go Cherry). All occur while in Open Loop. Closed Loop, sometimes will drive fine and then intermittently stall at idle and or stall continuosly closed throttle/ at idle.
The car is a OBD 2 phase in. OBD connector is "wedge side" (OBD 2) but the emmission label does not designate this vehicle as OBD 2. OBD 1 and 2 interface will not communicate with PCM. Check engine lamp will illuminate in Closed Loop.
How can codes be accessed? Is PCM OBD inoperative? I have '93 Bonneville GM Shop manuals. Are systems similar enough to use OBD fuction diagnosis by referencing wire color @ OBD connector?
GM should have left good enough alone and stuck with engine light code display!
I have the exact same problem with my 94. I would like to know what you did to fix it. Please help.
Posted on Mar 20, 2013
You are describing exactly what a lot of 94-95 GM car owner are feeling. I have an AUtoXray6000 scanner and it can read the trouble codes on this car, (I have a 95 Bonneville) but wont read the data stream. Basically you have a OBDII plug, but the car is controlled by the same OBDI system as others prior to 96. There are some scanners that have the ability to read the codes and data stream on these cars, others can only read the codes. If you can get or design an interface cable plug and know how to route the wires, you're in like flynt. Here is a web site that makes parts for a conversion cable.. http://www.obd2allinone.com/sc/pages.asp?pageid=63
Posted on Feb 06, 2009
A blown fuse will also cause the obd to not communicate
Posted on Nov 12, 2008
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Posted on Jan 02, 2017
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