2000 Merc- Rough Idle
40

Asked by Natalie Jul 06, 2015 at 11:47 AM about the 2000 Mercury Grand Marquis GS

Question type: Maintenance & Repair

Replaced my intake manifold and coolant leak is gone ( HOORAY!!) and my car is
running at normal op temp. I have had a rough idle for maybe 6 weeks now ( before
manifold replacement) but it did get worse after I replaced the water pump 3 weeks ago
( then I replaced the manifold and it was cracked- melted-). There is a whine from the
belt area. The belt looks good and I sprayed water as it was running and there was no
reduction in the whining sound. The rough idle is what is now driving me insane.

Any possible ideas?



End note- Could I just be a ninny that didnt tighten my belt properly?

2 Answers
157,325

Bob answered 8 years ago

How many miles? How long since sparkplugs have been changed? Is the check engine light on?

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5,295

Trippmeister answered 8 years ago

The belt idler pulley, or the tensioner could be bad and making the noise. Replace both. The idle could be a lot of things. Were the gasket surfaces cleaned will when the manifold was replaced? spraying gas at the joining points will tell. It will idle smoothly for a while if there's a leak. Replace the plugs also, as per Bob.

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