Mercury Grand Marquis misfire problems

Filed Nov 5, 2020 · Brakes, Engine · TX

Air leak in intake manifold or egr or PCM system cylinder 3 misfire dirty fuel injection

Filed Apr 21, 2017 · Engine · 185,000 miles · MI

Plastic intake manifold failed, antifreeze leaking from around thermostat due to this failure and leaking into coil packs and causing major misfire in motor. Happened suddenly, no indication of leak prior to this failure. Was driving when this happened and had to call for help to get vehicle back home, and now can't drive it . Cost to fix is expensive, and the car ran great until this happened. Sounded like I has thrown a rod, popping louder on exceleration, so I immediately parked it and turned off the motor.

Filed May 31, 2016 · Engine · 80,000 miles · NH

Tl* the contact owns a 1998 mercury grand marquis. While driving various speeds, the engine misfired and hesitated to respond. The vehicle was taken to an independent mechanic who diagnosed that the plastic intake manifold was cracked, which caused anti freeze to leak out and damage the engine coils. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was 80,000.

Filed Feb 10, 2016 · Engine · 178,000 miles · OH

Tl* the contact owns a 2003 mercury grand marquis. The contact stated that there was an abnormal noise coming from the engine and the check engine warning indicator illuminated. The vehicle was taken to an independent mechanic where it was diagnosed that the number two cylinder spark plug misfired and the head of the motor needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 178,000.

Filed Apr 10, 2010 · Fuel system · 100,250 miles · TX

During normal operation of my car, the check engine light came on and stayed on. I had the engine light codes read and it indicated that two cylinders were misfiring. I took the car to a service shop to have the spark plugs changed. I was told that the intake manifold had developed a crack which was allowing coolant fluid inside the manifold cavity and this is what was causing the cylinder misfire. The car is a 1999 mercury grand marquis with a 4.6 ltr. Engine. The intake manifold is made of a plastic material and tends to crack next to the thermostat housing. This is exactly where the intake manifold on my car cracked. I have since found out that the ford motor co. Issued a recall bulletin to their ford and lincoln mercury dealers in december 2001 advising them of the defect. Subsequently, certain favored fleet owners of mercury marquis and ford crown victoria automobiles (police, limo and taxi companies) were notified of the recall. "civilian" owners were excluded. I owned my mercury grand marquis at that time and was not notified of the recall. My exclusion from the recall notification resulted in my being exposed to the potential fire hazard of the cracked intake manifold, as well as the inconvenience and considerable expense of having to have the defective manifold replaced. Because of the selective recall that ford motor co. Made regarding defective intake manifold, a class action lawsuit was filed against ford motor co. On behalf of excluded owners and ford motor co. Had to make restitution to such owners. I was not a party to the lawsuit because I was not made aware of my status as a wronged owner. I would like to know why the nhtsb did not require that ford motor co. Notify me about the recall to replace the dangerous defective intake manifold on my car?

Filed Oct 26, 2009 · Engine · 54,300 miles · NJ

Tl* the contact owns a 1999 mercury grand marquis. He could not accelerate past 30-35 MPH. The vehicle was taken to an authorized dealer for diagnostic testing. The technician stated that the failure was because of a plastic intake manifold. The vehicle was repaired with the replacements of a metal intake manifold and spark plugs. The following day after the service repair, he experienced rough idling while starting the engine cold. The authorized dealer was notified of the failure, but no remedy was available. The failure mileage was 54,300. The current mileage was unavailable.

Filed Dec 3, 2008 · Engine · 87,000 miles · FL

Car started running hot all of a sudden..found out the intake manifold was cracked and the coolant was leaking on spark plugs and fuel injectors. Causing the car to misfire and slow to pick up speed. Tried to get fixed but was told the exp. Date was in 07.so I have to pay out of pocket..I feel a recall shouldn't have an expiration date cause it tells you that one of these days the part on the car is going to need to be fixed. I feel ford should live up to their word and fix the problem no cost to customer...

Filed Dec 11, 2007 · Fuel system · 78,002 miles · IL

1999 mercury grand marquis ls 4.6l (1) drove vehicle in a normal way, commuting from home to work daily. No speeding. In the mornings properly wait for 10 minutes to warm up the vehicle's engine prior to driving. Kept proper maintenance schedule by ford/mercury dealership. Never brought up to my attention of the possible default this part may cause down the line. Had a complete coolant flush for radiator. Replaced with new coolant. (2) misfire in cylinders 6 + 2. Check engine light on. Small amounts of coolant leakage onto top part of engine, profusely around the spark plug chambers. Coolant come in contact with alternator affecting check battery light to go on. Vehicle showed signs of intense shaking at idle and at normal driving conditions within 1 hr after check engine light came on. Vehicle is a 199 mercury grand marquis ls 4.6l. Vehicle could not be driven w/o being extremely shaky while driving. Hesitation present. On cold days, small presence of coolant traces were found inside the spark-plug pits along side the ignition coils and at times small vapor came from inside the engine noticed from inside the driver's seat coming from inside the hood causing concern. I found the following from the following ford parts website: http://www.1aauto.com/1a/intakemanifolds/-/-/1aeim00012. "the original intake manifold, due to the design, has an abnormal tendency to crack, leading to overheating and in many cases complete engine failure and/or damage to other parts of the car's engine. This new and improved intake manifold is designed to eliminate those problems!". (3) dealership charged me over $1500.00 for replacing the intake manifold, spark plug and ignition coil for cylinder #2 plus an oil change and filter. I requested old parts back and only the spark-plug and ignition coil was returned to me.

Filed Feb 19, 2007 · Engine · 206,450 miles · TX

The intake manifold has a hairline crack on the rear heater hose inlet. Anti-freeze is seeping out into the #4 spark plug causing misfiring. This plastic manifold was previously replaced before the recall to repair defective manifolds. This is the replacement manifold with a separate aluminum hot water cross over in front.

Filed Feb 18, 1998 · Brakes, Transmission · GA

Transmission runs rough and noisy.