Question about 2004 Mazda MX-5 Miata
My 1998 mazda MX-5 idle runing badly when cold, dissepears when warm. It's one cylider that dont't works normaly.
The first thing I would do is a compression test, even if you just do that hole, after that, just put a new plug in because you already have the old one out. If you have decent compression (anything over 125psi) and the new spark plug doesn't solve the problem, I would be very suspicious of the injector. When the engine is cold, the fuel must be atomized really well to support combustion. Typically fuel injectors do a great job of this because they spray a fine mist into the port. This is what makes injected engines so nice to start and drive in the cold weather. However, if the injector gets fouled or plugged, it will squirt a thin stream that does not ignite well unless the engine is hot. Sound familiar?
Posted on Apr 15, 2009
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Posted on Jan 02, 2017
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