my 2000 mx5 has occasional missfire on starting ie 3 cyls only this clears after a few minutes and may not happen again for weeks any ideas

Asked by Feb 01, 2014 at 11:04 AM about the Mazda MX-5 Miata

Question type: Maintenance & Repair

2 Answers

10

This could be caused by a weak coil or high resistance in a plug wire. Until the vehicle goes into closed loop, the air/fuel ratio is predetermined and may not be optimal. That causes it to be harder to fire the spark. I would check the ignition system first. A bad fuel injector is another possibility. There is an outside chance of a blown head gasket also. Either way, it probably needs to go to a good repair shop for diagnosis. Be prepared to leave the car overnight so the tech might be able to duplicate the concern. David www.networkautomotiveprescott.com

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21,355

Spark plugs with large gap that need changed, leaking fuel injectors or the start of a blown head gasket.

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