Question about 2000 Mazda MX-5 Miata

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Hi I have a 2000 MX5 Miata lefthand drive car. I has a problem with the CEL coming on occasionally and sometimes when you have been driving the car and start it again it runs really rough like it has very little power. It sounds a bit like a tractor and has very little power and hard to keep going feels like it is going to die on me all the time. After a while it or when you stop it again it seems to come right again until next time.

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Check Engine Light is turned one when the engine control module detects a fault in the ECM system - usually in the emissions system. One or more diagnostic codes will be stored in the engine module and these codes are the information you must use use to diagnose the problem. But an not so uncommon cause for an ECM malfunction on a Miata is an old battery: clean the clamps and the battery plugs with wire wool then test the voltage with both the engine on (around 14.5v) and off (above 12v).
Yes, all the symptoms you describe are what you would expect from an engine with the CEL lit.

Posted on Jul 06, 2010


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