Clio Williams & 182
Car: 2004 Renault Clio 182 FF Cup Pack
Symptoms:
Low idle
Hesitation
Poor power delivery
Kangerooing
Waffle:
I picked the car up about 4 weeks ago knowing it needed a dephaser and cambelt change as it sounded like a diesel. Parts and tools ordered.
It also had a poor idle and was too low at about 600RPM but drove fine under open throttle.
Before I had time to do the belt and pulley the car showed a non-flashing emissions warning light. Car was fine.
Replaced MAP sensor, slight improvement but then faded back to poor.
Crank sensor replaced. No change.
Spark plugs changed. No change.
Coolant temp sensor changed. No change.
HT leads checked. No change.
TB cleaned. No change.
Pre-Cat lambda changed. Much more linear power delivery, but idle unaffected.
Checked alternator and battery. Both supplying correct output.
Not long after, and probably related, the emissions light started flashing and there was a misfire on piston 4.
Garaged car. Took it apart. Replaced dephaser and timing belt. Tool bent. Redid timing and triple checked it.
Car was noticeably a lot quieter.
Injector 4 replaced. Misfire gone.
Still, poor idle and hesitation remained.
Compression test results came back good in case timing was out.
MAP sensor test: turn car off, unplug sensor, start car and test drive. No more problem.
Conclusion: Wiring loom and/or plug connection at fault.
Next action will be to trace wiring and check plug to the MAP sensor.
Lesson: replacing parts can help diagnose things but never forget the wiring or plugs themselves can be at fault.
Pics to follow.
Symptoms:
Low idle
Hesitation
Poor power delivery
Kangerooing
Waffle:
I picked the car up about 4 weeks ago knowing it needed a dephaser and cambelt change as it sounded like a diesel. Parts and tools ordered.
It also had a poor idle and was too low at about 600RPM but drove fine under open throttle.
Before I had time to do the belt and pulley the car showed a non-flashing emissions warning light. Car was fine.
Replaced MAP sensor, slight improvement but then faded back to poor.
Crank sensor replaced. No change.
Spark plugs changed. No change.
Coolant temp sensor changed. No change.
HT leads checked. No change.
TB cleaned. No change.
Pre-Cat lambda changed. Much more linear power delivery, but idle unaffected.
Checked alternator and battery. Both supplying correct output.
Not long after, and probably related, the emissions light started flashing and there was a misfire on piston 4.
Garaged car. Took it apart. Replaced dephaser and timing belt. Tool bent. Redid timing and triple checked it.
Car was noticeably a lot quieter.
Injector 4 replaced. Misfire gone.
Still, poor idle and hesitation remained.
Compression test results came back good in case timing was out.
MAP sensor test: turn car off, unplug sensor, start car and test drive. No more problem.
Conclusion: Wiring loom and/or plug connection at fault.
Next action will be to trace wiring and check plug to the MAP sensor.
Lesson: replacing parts can help diagnose things but never forget the wiring or plugs themselves can be at fault.
Pics to follow.
