1990 Mazda Miata MX-5 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1990 Mazda Miata MX-5
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1990 Mazda Miata MX-5 ProblemsTicking Noise From Valve Lash Adjusters Due to Infrequent Oil Changes
A loud ticking noise (hydraulic valve lifter noise) may be heard from the top of the engine, particularly when the engine is still cold. The noise may occur more frequently on higher mileage vehicles; Hydraulic valve lash adjusters may need to be replaced to correct this issue. Following the maintenance schedule for oil changes will also help prevent a recurrence of the noise.
The engine may idle roughly or stall when it's cold because the oil pump pressure relief plunger is sticking. Failure is usually due to wear and it causes excessive oil pressure to pump up the hydraulic valve lifters keeping the valves from closing completely, which results in a loss of compression. The oil pump will need to be replaced in this case.
Misfires under load (acceleration) can be caused by spark plug wires arcing to the cylinder head in the spark plug wells. Water in the spark plug wells can also cause the same problem so careful diagnosis is needed.
1990 Mazda Miata MX-5 QuestionsKnocking/tapping sound especially when I shift (1 answer)
My car has 180 thousand miles on it. It sounds as if its knocking once it warms up. Then you hear it continually at 60mph... My oil pressure is at 30 please someone help me. I love this car and don't wanna tear it up
But it starightens out after you get going.Runs great on top end.I have check plugs and wires..I hope its not the key hole in the crankshaft .Is that expensive to replace?