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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   Drive Shaft Repair I have a 2015 Chevy Traverse AWD. The fr...   2006 Toyoto Camry XLE Driver Side Electric Window Trouble Hello, Looking for a little brain help ...   Tierod end change caused some kind of leak Hello so I just took my car to the nearb...   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...

Search Auto Parts Search 1999 Mercury Grand Marquis Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Car Troubleshooting Guest Anonymous Poster dsheets2764@sbcglobal.net Jun 7, 2008, 2:34 PM Post #1 of 5 (4480 views) 1999 Mercury Grand Marquis Sign In 1999 Mercury Grand Marquis engine is not running properly. Idles and revs fine when not in gear. Hesitates and a little rough idle when in gear. Seems to run slightly worse while AC unit is on. What is the problem? Is this a likely O2 sensor problem, or perhaps a transmission sensor? Any help would be appreciated. Thanks! way2old Veteran / Moderator Jun 7, 2008, 2:47 PM Post #2 of 5 (4474 views) Re: 1999 Mercury Grand Marquis Sign In What is the mileage? When was the last tune up? When was the fuel filter last changed? We need all the maintenance information you can give us so we will not be asking things that you have already done. Let us know. Being way2old is why I need help from younger minds Guest Anonymous Poster Jun 8, 2008, 8:52 AM Post #3 of 5 (4472 views) Re: 1999 Mercury Grand Marquis Sign In Mileage = 100495; as to the rest - car was bought used from son of deceased owner. Son was not sure of any maintenance records. Oil has been changed recently. Car is clean and ran great initially. Only recently did this problem develope. Any info and/or advice you can give will be appreciated. way2old Veteran / Moderator Jun 8, 2008, 10:12 AM Post #4 of 5 (4471 views) Re: 1999 Mercury Grand Marquis Sign In I would start with spark plugs and fuel filter. These are rather inexpensive and easily done yourself. You will need a tool to releadse the lock on trhe fuel filter, but other than that, general tools will finish the rest. Ratchet, short extension, a good 5/8 inch spark plug socket and a 7mm or 1/4 inch socket to remove the coils. Being way2old is why I need help from younger minds Guest Anonymous Poster Jun 9, 2008, 8:32 AM Post #5 of 5 (4462 views) Re: 1999 Mercury Grand Marquis Sign In Thanks for the info and the help. We'll give it a try. Thanks again. It is appreciated.   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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