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.

Cracked Intake Manifold Causing Engine Failure

1998 Pontiac Bonneville

This problem may be covered under warranty. Ask your Pontiac dealer.


really awful
Typical Repair Cost:
Average Mileage:
95,190 miles
Total Complaints:
6 complaints

Most Common Solutions:

  1. replace intake manifold, clean coolant from engine (4 reports)
  2. not sure (1 reports)
  3. replaced engine with new factory engine (1 reports)
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

problem #6

Jul 222006

Bonneville SE

  • Automatic transmission
  • 140,000 miles


I broke down in the middle of nowhere on I-65 between Columbus IN and Indianapolis. I had to have it towed. It took two days and $1200 for a Firestone in Greenwood IN to fix it. UGH!

It's now 5 years later and guess what!?! I'm dealing with the same D@*&ED problem again!!!!!

- , Berne, IN, USA

problem #5

Feb 132008


  • Automatic transmission
  • 82,000 miles

Same as everybody else. Had a local good-ole-boy garage fix it pretty cheap, runs great now.

- , Roanoke, TX, USA

problem #4

Dec 222006

(reported on)

Bonneville SE 3.8L

  • Automatic transmission
  • 125,338 miles

had the intake manifold cracked to and was told when i got it replaced Gm did know about this for 2 years and didn't do anything about it. the new 1 they put in isn't plastic . also what color is yours? mine is white and the paint is coming off

- , Springfield, OR, USA

problem #3

Mar 182005

(reported on)

Bonneville SE

  • 107,000 miles


I cannot believe after doing research on this problem there is not a class action lawsuit against GM for the 3800 engine that has the plastic intake manifold that seem to go. The dealer wants $1450.00 to fix it, I haven't called a local garage yet. This is a serious problem and I feel GM needs to step to the plate and take ownership and say we screwed up and we are going to fix this for you all. What are we supposed to do?

- , Clio, MI, USA

problem #2

Nov 152006

(reported on)

Bonneville SE

  • Automatic transmission
  • 58,800 miles

Same exact problem as clwills. Driving on highway and engine started shaking and knocking crazily. I forget if it's the upper or lower intake manifold that fails, but it's common. The dealer in Henderson NC was closest to me when it happened (I was actually 100 miles North in VA). They replace the manifold, got the coolant out of the engine, and had to replace the starter. But depending how long you drive with the problem I don't know if they can fix it this way.

- , Raleigh, NC, USA

problem #1

Oct 052002

(reported on)

Bonneville SE

  • 58,000 miles

The engine started spark knocking loudly at 65 MPH on the interstate. It sounded like a Mercedes diesel. I immediately pulled off the Interstate and shut off the engine. After being towed in, dealer said engine was totally ruined and it was locked up. The plastic manifold had cracked allowing water into the combustion chambers and crankcase. This was later found to be a problem on all newer 3.8 engines.

- , Raleigh, NC, USA

Not what you are looking for?