1999 Pontiac Montana: engine stalls while driving

Filed Mar 27, 2004 · Acceleration · VA

1999 pontiac montana VIN [xxx] good weather good road condition. While attempt to accelerate a bit at about 60 MPH the car began to accelerate on its own as though the cruise control was on. Tapped the brakes and made sure the cruise control was off but continued to accelerate. Put it neutral and the acceleration stopped. Problem kept repeating and didn't necessarily stop when in neutral. Then while car was in neutral and coasting at about 50 MPH car switched into park on its own and stalled. Restarted car and got it over to the shoulder and turned it off. Tried to restart but the engine raced furiously. Called for a tow truck. The tow truck operator turned on the car and put it neutral to position it to winch it up the flatbed. The car put itself in drive and raced up the flatbed which was at a steep slope until it struck the front frame of the flatbed and the driver could turn it off. This was very scary. Someone could have been killed.*ak information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).

Filed Jun 18, 2002 · Engine · OH

Camshaft broke while consumer was driving, causing vehicle to stall out. Contacted dealer.

Filed Nov 8, 2001 · Engine, Transmission · PA

We have occasionally had problems with the transmission shifting hard, whining & banging into gear-this goes away if you turn the vehicle off & then back on . It occurrs at slower speeds not highway speeds & seems to happen only on short trips or longer trips with several stops. Recently there was a coolant leak in the system , which a local shop "repaired" for $67 the first week of october. Almost two weeks later the vehicle began running hot again & we were then told it needed a new head gasket. We had the vehicle back for a week when after getting off the highway & stopping for a red light the vehicle started to stall & the low oil pressure light came on. After parking the car & restarting it -it started making a horrible sound & we had it towed in to the nearest pontiac dealer. There we were told that the head gasket shouldnt have needed to be replaced that those engines almost never leak from the head gasket but apparantly they commonly leak from the intake valves. In addition, they said that the garage that did the head gasket did something wrong which caused a blockage in the engine & prevented oil from getting into the top of the engine. They said there were two bolts that were loose & eventually found to be sheared off & that one of the outer heades-not the cylinder heads - were cracked. I have no way of finding out what actually caused the engine failure. I found no technical service bulletins on the head gaskets or the intake valves. Rif the engine had to heads a ardiastiotnetrstarting ccor.

Filed Aug 29, 2001 · Engine, Transmission · OH

Purchaused used (6 months old) have now owned auto for 2 years. At 38000 miles transmission starting shifting harsh at times, had to replace transmission. Engine has started acting as if it is going to stall for no apparent reason. Radio has been replaced 3-4 time, due to garbbled display. Most recently however, I had door locks repaired, and was told that the wires to the locks were damaged due to the water intrusion caused by the air conditioning leak into the auto instead of outside the auto.

Filed Dec 21, 2000 · Electrical, Transmission · TX

The van has stall/hesistated in traffice while traveling 60mph. There have been 8 visits to try and correct this problem. Spark plug replaced, pistons replaced, motor replaced and transmission replaced and transmission has been worked on for a second time.

Filed Apr 10, 2000 · Engine · TX

The van stalls or hesitates without any kind of warning. This happens while driving or taking off after a stop. The van has stalled four times since october of 1999. Van is at the dealership. Dealer is not able to remedy this probelm. Please provide any further information.

Filed Mar 16, 2000 · Engine · DC

While driving on highway/stopping or pulling off or taking foot off gas pedal, vehicle stalls. Has to drive with both feet in order to keep the rpms up. Contacted the dealer, and vehicle is still at the dealer. But, dealer can't duplicate the problem.

Filed Mar 9, 2000 · Transmission · SC

Intermittently, transmission will shift very rough and hard, and transmission emits a whining noise. Once it starts, it continues until the vehicle rests. Also, after driving a distance continuously of 200 miles or more, the vehicle will consistently stall at red lights or stopsigns until it has rested at least a few hours.