Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

Please take a moment & say thank you by donating $5 or whatever you can to the Center for Auto Safety.

NHTSA — Engine And Engine Cooling: Engine Problems

1998 Pontiac Bonneville (Page 2 of 2)

3.3

definitely annoying
Crashes / Fires:
0 / 2
Injuries / Deaths:
0 / 0
Average Mileage:
40,524 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

1998 Pontiac Bonneville engine problems

engine problem

Find something helpful? Spread the word.
Get notified about new defects, investigations, recalls & lawsuits for the 1998 Pontiac Bonneville:

Unsubscribe any time. We don't sell/share your email.

1998 Pontiac Bonneville Owner Comments (Page 2 of 2)

« Read the previous 20 complaints

problem #14

Apr 162003

Bonneville

  • miles

A D V E R T I S E M E N T S

The upper intake manifold cracked, which caused coolant to leak onto the engine. The dealer stated the problem occurred due to the plastic manifold not being able to withstand engine heat temperatures.

- High Point, NC, USA

problem #13

Apr 032003

(reported on)

Bonneville 6-cyl

  • Automatic transmission
  • miles
The original and the replacement upper intake manifold malfunctioned. Mr scc

- Champaign, IL, USA

problem #12

Nov 282002

Bonneville 6-cyl

  • miles
There were problems with the intake manifold. * mr the vehicle failed to start due to the coolant leaking into the cylinders. The consumer then received a bulletin which was in reference to the intake manifold/coolant consumption leak. Scc

- Scotch Plains, NJ, USA

problem #11

Jan 242003

Bonneville

  • miles

A D V E R T I S E M E N T S

The consumer couldn't get the vehicle started. The consumer tried to get the vehicle started again and heard a loud noise which was followed by a fire under the hood. Referenced in EA02-030

- Roopville, GA, USA

problem #10

Jan 172003

Bonneville 6-cyl

  • Automatic transmission
  • 70,000 miles
Plastic intake manifold cracked. $1500 repair due to poor design. Engine stalled due to coolant leaking onto engine cylinders. Have done extensive research including web sites like carreview.com where over 10% of all comments on this car (good or bad) complained about intake manifold problems. Recall seems in order.

- Dover, NH, USA

problem #9

Apr 282003

Bonneville 6-cyl

  • Automatic transmission
  • 114,500 miles
Plastic manifold melted causing coolant to flow into the piston chamber. This seems to be a major malfunction with this part and should be brought to GM's attention to be recalled with a better solution than a plastic manifold.

- Milwaukee, WI, USA

problem #8

Jan 242003

Bonneville 6-cyl

  • Automatic transmission
  • 87,000 miles

A D V E R T I S E M E N T S

Second replacement of the upper intake manifold.

- Champaign, IL, USA

problem #7

Dec 302002

Bonneville 6-cyl

  • Automatic transmission
  • 52,000 miles
1998 Pontiac bonniville they use a plastic intake manifold cover of schrowed.within this cover they have hole for the egr valve which gets very very hot, and to cool this they run coolant around this within the plastic. Don't they realize that the plastic will crack from expansion and contraction and coolant will infiltrate the intake manifold and the entire combustion chamber, exhaust. This happened to my 98 bonniville and I want this to be investigated.

- Lk Grove, NY, USA

problem #6

Jul 022002

Bonneville 6-cyl

  • Automatic transmission
  • 60,000 miles
Please see the attached complaint

- Metmora, IL, USA

problem #5

Jul 022002

Bonneville 6-cyl

  • Automatic transmission
  • 60,000 miles
While in motion, the engine died causing a pile up on the highway. The engine manifold and the gasket caused what is called a vapor lock up. This is a continuous problem with this vehicle. The manifold and gaskets have been replaced 4 times prior.

- Metmora, IL, USA

problem #4

Oct 182002

Bonneville

  • miles

A D V E R T I S E M E N T S

Consumer states that while driving at any speed and no warning coolant fluid are being pump into the engine. Dealer notified

- Freeburg, IL, USA

problem #3

Jul 052002

Bonneville

  • Automatic transmission
  • miles
While driving vehicle started running rough. Then, the engine stopped. Contacted dealer, valve cover gasket was leaking, and water went into engine cyclinder. This is a common problem. The mechanics removed/replaced the intake manifold, both upper and lower manifold gaskets.

- Cincinnati, OH, USA

problem #2

Apr 132001

Bonneville

  • miles
The vehicle's intake valve covers cracked and the coolant was sucked into the cylinders causing the engine to overheat and stall.

- Egg Harbor, NJ, USA

problem #1

Apr 232001

(reported on)

Bonneville

  • miles
Rod bearings for cylinders 1 and 2 failed due to lack of lubrication with recommended amount of oil in the vehicle. GMC is not interested in finding the root cause. They have insinuated that we ran the vehicle without oil but can not explain why bearings for cylinders 3-6 show no signs of lack of lubrication. GM is not offering any assistance although the vehicle is barely beyond warranty.

- Rcokford, IL, USA

Not what you are looking for?