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Engine Judders at idle but goes away while driving

Tiny
TONY HANNON
  • MEMBER
  • 2004 RENAULT MEGANE
  • MANUAL
  • 90,000 MILES
My car has developed a judder at idle that vanishes when driving, which is replaced by an engine warning light whilst driving. This light vanishes as soon as idling. Mechanic friend disconnected coils from under car to test for bad one which he located.

Which coil part is this that I need to replace? Wish to order part but money is tight so do not want to order wrong component.
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Monday, December 5th, 2016 AT 10:59 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hey Tony,

I would replace the spark plugs first as these can cause the coils to malfunction. Next, runs the codes to see which cylinder it is and then replace that coil if needed, then clear the codes to recheck the system.

https://www.2carpros.com/articles/how-to-change-spark-plugs

and

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/check-engine-light-clear-codes

Please let us know happens so it will help others.

Best, Ken
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Saturday, December 10th, 2016 AT 1:24 PM

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