Question about 1991 Mazda MX-5

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Idle problems i have just had the head gasket done on my euno roadster 1.6, 91... since getting it back i been have problems with the idle.. when cold, it start's but idle drops and stalls... but once the engine is warm the idle is fine and run good.... i'm thinking it somethink to do with the choke... any ideas?

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With the engine running at normal temperature, put a bent paperclip between gnd and ten in the diagnosis box (
Left side of engine bay above the shock tower)
Under a plastic bung on the throttle body where the big black tube fits in near throttle cable, turn the screw until the revs are about 800-900 rpm ,Remove the clip and your done!.




Posted on Aug 08, 2008

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Posted on Jan 02, 2017

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I hate to be the barer of bad news, but may be the head gasket.

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I replaced the water pump, radiator cap, thermostat, coolant, fan belts, power flushed the system. Nothing worked. Some research gave me the answer.

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First thing you'll notice is the rough idle as the spark plug burns off the coolant in the cylinder. (This is especially true at low temperatures.) If it is the head gasket, the other symptoms will follow as time goes by.

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Mazda eunos roadster HELP


I'm assuming no-one deliberately added petrol to the cooling water. You'll probably find there's a heap of oil in there too. It sounds like you've got a cracked head or a dead head gasket. Pull the head off and check. You could also do a leak-down test or a compression test to try and tell where the problem is.

A note on the side - the car probably overheated BEFORE the oil/petrol leaked into the coolant. If you continued to try to run the car, the overheating would have got worse and worse - resulting in a crack or the gasket being destroyed.

If you're not mechanically minded, you've probably got a rather large problem on your hands and need to get someone else to look at it.

Sorry to give you bad news...
Sherwin

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