Had 1999 Grand Prix for seven months already had problems with drivers window not winding down. A part of the passenger door panel started to come off. Now drivers seat belt won't latch, and is currently in the shop for broken valve spring and damage to the head gasket as a result from the broken valve spring. Car only had 1 other owner and was running perfect also had perfect service records.

- Chesapeake, VA, USA

1999 Pontiac Grand Prix the intake was defective and locked the up the engine. The consumer spoke with the dealership, they have several complaints but no recalls as of now. Where the water comes in, the plastic housing intake is cracking and deteriorating and water entered the cylinders which caused the engine to lock up. The consumers wife was driving when this happened. The vehicle had to be towed and the mechanic could not turn the crank with a pipe wrench.

- Xenia, OH, USA

Leaks ant freeze into the block said it was the upper and lower intake gaskets. Need a recall on that.

- Charlotte, NC, USA

Vehicle's intake manifold cracked and engine coolant leaked into the engine. The upper intake manifold cracked and coolant leaked into the cylinders and seized the bearings. On another occasion the vehicle overheated. The consumer was told that the engine was damaged beyond repair.

- Winston-Salem, NC, USA

While driving the engine check light came on as vehicle started to accelerate and then sputter and misfire, almost causing a multiple car accident. Vehicle would not restart. After towing the car to the dealer(close to closing time), they determined that the problem was that the engine hydro-static locked and they needed to investigate why it happened. As an uncanny coincidence, another Grand Prix similar to mine(down to the same color car and towing company) was there for the same reason. The next morning the dealer stated they could fix it for around $1,200, but not stating why it happened or what caused the engine to lock up and that they were working on it right then. After none of my questions were getting answered I stormed into where my car was(in the back lot... parked!!!!), while I called a tow company, and demanded my keys back. A mechanic that supposedly looked at my car stated that the intake manifold was the problem causing the engine to hydro-static lock and that my starter shattered upon restart testing. After leaving without repairs and towing my car to my residence, I looked under the hood and discovered that my car wasn't even touched...no bolts loosened or dust wiped off of them, the brittle wire holders and clips weren't disturbed...there was no way to find a fault like that without taking the intake manifold off. I finally fixed the problem myself by replacing the plastic intake manifold and gasket and starter(no problems since then, watching it closely and kept the old intake manifold and gasket). Squealing sounds started coming from under the hood (belt tensioner area) so I replaced the serpentine belt(squealing continued though). I found the that belt tensioner bolt that holds in the pulley was working itself out...not a good thing. The power windows and locks went out about 5 different times on the drivers side, and the radio display goes crazy and/or blanks out at times.

- San Antonio, TX, USA

Multiple repair problems--air plate was repaired--new engine installed after having only 54,000 miles with regular oil changes--electrical problem with radio display--now back passenger tire/possible axle, strut; sounds like back tire is about to fall off upon hitting bumps in the road/driveways or turning. I have not had this checked out-am now unable to drive vehicle.

- Tn, TN, USA

Faulty intake and/or intake gasket caused anti-freeze to leak into the engine resulting in engine failure. Repair bill was $1600. GM has issued recalls on 2000 and 2001 Pontiac Grand Prix models with the same issue, but will not admit to same problem with 1999 model.

- Kearney, NE, USA

The intake manifold was replaced a year ago and may have caused damage to the engine. The rod bearings failed. The heat gauge was noticed warmer than usual and eventually overheated and shut off. GM dealers agreed the cause was due to the failed plentum.

- Lake City, SD, USA

The intake manifold cracked while driving.

- Fort Sumner, NM, USA

Dealer replaced the engine on September 2002. Vehicle was driven for two weeks again, engine was replaced. On January 2003, engine was replaced for the third time. Consumer stated the engine needed to be replace again.

- Newark, DE, USA

The vehicle stalled without warning, which caused the consumer to pull over abruptly.

- Couderay, WI, USA

Faulty plastic intake manifold/ gasket on a Pontiac Grand Prix (1999) caused coolant leakage into oil and cylinders. Caused my car to quit on a busy highway (almost caused accident)

- Oxford, MI, USA

Both engine valve covers leak. Oil seepage has reached the bottom of the engine block at 22000 miles.

- Colwich, KS, USA

While accelerating from parked position, engine died and the ABS brake light come on. Vehicle was taken to the dealer, and problem was not found. Vehicle still experiencing the same proplem.

- New Berlin, WI, USA