Thread: 94 Bonneville either stalls while coasting or idles high
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Old 09-27-2009, 07:29 PM
Jrs3800 Jrs3800 is offline
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Re: 94 Bonneville either stalls while coasting or idles high
The 94 Bonneville does not use a Map sensor.. The EGR will be a linear and will cause a very rough unstable idle and possibly cause it to stall..

This car is an OBD1 compliant car, it does use the OBD2 16 Pin Connector and OBD2 codes... But it is fully OBD1 Compliant.. You will need a scan tool capable of reading the OBD1 94-95 GM cars..

With the idling issues that you are having there is a very good chance that the TPS is failing..

Look for a code P0122 or P0123
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