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Why does Ford Duratech 2.5 runs rough and check engine light on. I cleaned idle air control valve. Mooseing has stopped but engine still misses and check coolant light is on. The coolant level is fine?
Rickcentella
I can't help you with the rough engine. Maybe someone else can.
The coolant light is one of many tiny little engineering things with the Cougar1 ('99-'00), though this problem might also affect the Cougar2 ('01-'02) but I don't know if that was changed, which don't work right on all units. The problem is a faulty sensor that throws out a low level warning before the coolant drops below the MAX line, let alone the MIN line. You can safely top the reservoir off to about an inch over the MAX line without risking a spill as the reservoir fills due to coolant expansion.
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∙ 14y ago
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Why 1994 Legend RPM keep jumping up and down when at park only Could it be Idle control sensor?
Check the Coolant system, there is a coolant temp sensor that will cause the engine to do this if it is not actually in contact with the coolant. You will need to vacuum drain the coolant, refill then bleed all the air out of the system. On my legend this happened until realized the radiator cap was bad, it had lost it's seal so the coolant system lost pressure. I didn't realize because the coolant reservoir was full, but there was no pressure to pull the coolant through the system. It could possibly be the idle speed motor needing to be cleaned as well. Once I cleaned mine I haven't had any problems ever since.
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