Mercury Grand Marquis hesitation problems

Filed May 28, 2019 · Acceleration, Engine · 118,000 miles · FL

Tl* the contact owns a 2000 mercury grand marquis. While driving various speeds, the vehicle hesitated to accelerate. The failure occurred most frequently when traveling up hill. The failure was intermittent and the check engine warning indicator illuminated. The dealer was not notified. The vehicle was not diagnosed or repaired. The contact sprayed carburetor fluid on the intake manifold and noticed a crack. The manufacturer was made aware of the failure. The failure mileage was 118,000.

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 Jan 24, 2008 · Engine · 87,500 miles · CA

Tl*the contact owns a 1999 mercury grand marquis. While driving at an unknown speed, the vehicle hesitated, stalled, and the check engine light illuminated on the instrument panel. The vehicle also began to loose coolant. The vehicle was taken to a dealer and they discovered that the intake manifold was cracked. There was no recall on the intake manifold. The current mileage was 88,000 and failure mileage was 87,500.

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 Dec 1, 2006 · Engine · 77,980 miles · AZ

Dt*: the contact stated while driving 40 MPH, the engine hesitated and idled badly at a stop. The contact replaced the fuel filter, but problem continued. When taken to an independent service dealer, the diagnostics showed the manifold was cracked. The manufacturer was notified. The consumer stated the vehicle would sjip and jump. Updated 12/18/06.

Filed Nov 14, 2006 · Engine · 95,175 miles · TX

Engine failure due to a defective plastic engine intake manifold. 2000 mercury grand marquis began to hesitate; the dealer said it was caused by a defective nylon intake manifold, and they would not cover the cost of repairs. Ford has had many complaints on this defect.

Filed Dec 19, 2005 · Acceleration · 10,000 miles · KY · crash

Dt: while the contact's friend was pulling into a parking lot she pressed on the brake pedal and it hesitated while stopping the vehicle. On a separate occasion, while stopping at a stop light the accelerator pedal got stuck. This caused the contact's vehicle to rear end the vehicle in front. When the brake pedal was pressed the vehicle was non responsive. The contact had to turn the vehicle off to get it to stop. No injuries reported. The vehicle has not been to a dealership to be inspected concerning this problem.

Filed May 27, 1999 · Electrical · CA

While driving at 65-70 MPH ignition malfunctioned, causing momentary hesitations. Problem happened intermittently, and ignition failed 30 to 40 times. Although dealer says they know nothing about a defect with the thick film ignition module, news reports say that the tfi is mounted where engine heat on a hot day can cause it to fail.

Filed Mar 1, 1999 · Lights, Locks · TN

Have had the transmission worked on 3 different times. The third time they put in a new transmission. Which I had to pay for. The paint is peeling off and leaving big bare spots. I have had my right back door worked on several times because the locks wouldn't open and the windows would not roll down right now my right rear window and my left front window will not roll down!!! My car hesitates and jumps when I am going about 20-40 miles per hour, and when I hit 50-60 MPH my steering wheel starts to vibrate. My brakes squeak but we don't see nothing wrong. I have put about $3500 into this car since I bought it, and I am really sick of messing with it.

Filed Jun 27, 1995 · Electrical · FL

Upon acceleration vehicle hesitates or while driving vehicle will jerk. Please describe details. Tt