Have a 1994 pontiac bonneville starts and runs fine. Go to town stop at store shut off car and then it won't start back up for awhile. Change the igition module, camshaft sensor, oil pressure sensor, spark plugs, wire, etc. Do have any ideal what else it can be. Cleared all the codes and when it does it the check engine light comes back on. Stumped thanks for any suggestions or help you can give. Thanks alot

Marvin

• 85242 Answers
• Posted on Feb 10, 2009

SOURCE: Engine turns off when coming to a stop

I have used this procedure for years.
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

SOURCE: 1994 pontiac bonneville fires up but stalls imediatly

WOW a 94 with 46K on it thats rare. Your computer may be bad it sends the pulse to the injector.

SOURCE: 1994 pontiac bonneville.car starts but stops after

This car uses a key with a transponder chip in it. The ignition reads the value of the chip thru 2 small contacts just inside the entrance of the keyhole. These contacts are known to get dirty, wear out, or become totally disconnected from the wire they are hooked to. Use electrical cleaner in the lock cylider and run the key in and out a few times to clean the lock. This is your temporary fix. The next item you may want to try ,is having another chip key made. If this doesn't work, then you will need to replace the ignition cylinder. You can try "Plastichead Keys" for these parts. They can be reached at [email protected].