Problem Reports
Mazda Miata MX-5
Report: Engine Idles Rough or Stalls When Cold
Mazda Miata MX-5 Problem
4 Reports
Model Years Affected: 1990, 1991, 1992, 1993
Engine Affected: 1.6L 4 Cylinder
Verified
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.
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