Having problems with your 1997 Pontiac Sunfire ?
Timing does not advance - 1997 Pontiac Sunfire
The est mode is in the ignition module,and works with the computer to advance the timing,either the module is bad(ignition),or the computer.
Repair Help & Product Troubleshooting for 1997 Pontiac Sunfire
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.