2000 Merc- Rough Idle

Asked by 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

44,585

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

1,205

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.

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,340
#2 kbro
kbro
Reputation 2,050
#3 Js08016
Js08016
Reputation 1,710
View All

Related Models For Sale

Used Ford Crown Victoria
8 Great Deals out of 1,049 listings starting at $2,225
Used Lincoln Town Car
30 Great Deals out of 1,808 listings starting at $600
Used Chevrolet Impala
515 Great Deals out of 29,109 listings starting at $1,100
Used Cadillac DeVille
11 Great Deals out of 1,603 listings starting at $1,499
Used Lincoln Continental
4,173 listings starting at $41,448
Used Ford Mustang
364 Great Deals out of 46,830 listings starting at $1,999
Used Ford Taurus
218 Great Deals out of 20,165 listings starting at $1,650
Used Ford F-150
2,213 Great Deals out of 208,669 listings starting at $1,499
Used Chevrolet Tahoe
563 Great Deals out of 27,153 listings starting at $999
Used Honda Accord
717 Great Deals out of 87,000 listings starting at $1,250

Used Cars For Sale

2008 Mercury Grand Marquis GS For Sale
37 listings starting at $3,995
2007 Mercury Grand Marquis GS For Sale
46 listings starting at $2,794