Manifold/header/muffler/tail Pipe Problems of GMC Suburban

: the contact stated the gas gauge located on the instrument panel failed. Also, while parked in the garage, there was a liquid observed on the floor. The dealership determined the intake manifold was leaking.

See all problems of the 1999 GMC Suburban 🔎.

1999 GMC Suburban SUV: leaking intake manifold spilling coolant to environment. Engine damaged as coolant mixed with oil and/or fuel. 50k miles, driven by soccer mom to school, practice, church. Epidemic problem per family mechanic performs dozens of these repairs per month. High expense for this premature failre: repair $780.

I have two GMC vehicles with the same engine, a gas 5. 7l v8, that required intake manifold gasket replacement within one month of each other. The first vehicle is a 1996 1500 Suburban with 90,000 miles. The other is a 1998 k1500 pickup with 80,000 miles. Both leaks occurred at the rear of the bottom intake manifold. The mechanic performing the repair states this is a very common problem with his shop performing approximately 5-6 a month in a town of only 30,000. The dealer denies any generic problem. Inspection of the gasket implies a temperature related problem of the gasket body that undermines the seal ridge.

See all problems of the 1996 GMC Suburban 🔎.

While driving the vehicle overheated. The dealer determined that the intake manifold was leaking coolant which caused the engine to overheat.

1997 GMC Suburban- multiple engine & transmission failures. At 60,000 miles, vehicle began to shift hard. Returned to shop for diagnosis and repairs several times for work. Finally, while driving the vehicle in city traffic, the transmission failed compeletly. Required valve cover and transmission rebuild @ cost of $2,000. On December 27 '03, had to replace the radiator. On Jan 17 '04, discovered that there was no antifreeze in new radiator. Returned to mechanic who replaced the radiator. Said the intake manifold needed to be replaced. Cost: ~$600. Took to another mechanic for second opinion. Same diagnosis. Both state that gm is aware of both problems, however, they will not cover the costs of repairs or replacement. Additionally- replaced alternator two times; replaced water pump two times; replaced the master cylinder in fall 2003.

See all problems of the 1997 GMC Suburban 🔎.

Left rear intake manifold leak. On a 1999 vehicle with only 48,520 miles (light useage for mom and kids) this problem seems a bit premature. My brother who owns a 1998 GMC with about 60,000 miles had simular problem. The part must be defective as both problems are very simular in nature. Cost to fix $700 to $1,000 . Thank you.

Manifold gasket failed on my vehicle at 67,000 miles and probably well before this but I was not aware of the problem until picked up on routine maintenace check. Normally, I would fix the problem and move since I have gmpp (extended warranty) with no out of pocket costs. Not in this case. The problem here with the manifold gasket is not about noise pollution. It is about carbon monoxide and other noxious gas leaking into the vehicle. Before the lawyers at GMC pick up their pencils and start taking notes, the end result in my case was only one of feeling tired at the wheel. Problem solved when the new manifold gaskets were installed. Everyone happy, no accidents--not quite so fast. . Well here is the problem: I have been told that this problem is endemic to this series of vehicle and to be expected every 36,000. If true, then there are a lot of people driving 1997 and earlier GMC Suburbans around tired or worse. As a physician, I am well aware that the long term effects of exposure to low levels of vehicle emissions is unhealthy. I would like GMC to produce data to the NHTSA on the frequency of manifold gasket leaks in this series vehicle/engine, the liklihood of such leaks sending exhaust emissions into the vehicle and the probability of such leaks producing catastrophic results on the highway. The next time I pick up a paper and read that someone driving a GMC vehicle "fell asleep at the wheel" I would like to know that it was an accident unrelated to carbon monoxide poisoning.

On April 10, transmission failed and vehicle was returned to dealership. On April 18, the vehicle was returned to the owner after having replaced the transmission, the transmission cooler, and intake manifold gasket. On April 27, 2000, the engine failed on a busy road as schools were letting out. The engine failure, put both the occupants of the vehicle at risks and the schoolchildren also, as the engine failure resulted in loss of power steering and power brakes. The driver avoided collision but with no steering and loss of braking power, the results could have been catastrophic.

#7 spark plug would fail. Also, changed intake manifold & head gaskets. Problem was not intermittent. Happened all time. Took vehicle to shop for repairs & problem still exists.