Car would get horrid gas mileage, occasionally stall, exhaust smell under hood, black exhaust. The crossover pipe from each exhaust manifold has a common cracking on the bellows and must be replaced, they run $2500 from gm which just crack again, or $425 for jeff m one that doesn't crack. The pipe cracks cause fresh air to enter the exhaust and the oxygen sensor thinks the cars running rich, causing horrible gas mileage, oil contamination, and stalling. The extra heat from the car running rich cracks the turbo housing.
1990 Pontiac Grand Prix engine problems
16 complaints (9% of all complaints for this car).
- owner complaints
- 16
- of this car's complaints
- 9%
- crashes
- 0
- recalls
- 0
Which part fails
- Engine8
- Exhaust system: manifold/header/muffler/tail pipe2
- Engine: gasoline2
- Exhaust system: emission control: catalytic convertor1
- Exhaust system1
- Engine: gasoline: turbo/supercharger1
- Engine: gasoline: belts and associated pulleys1
- Cooling system1
At what mileage
Complaints by mileage at the time of the problem.
Pontiac Grand Prix engine problems in other years
Specific symptoms reported on the 1990 Pontiac Grand Prix engine
Phrases found in the owners' own descriptions, so one complaint can mention several symptoms.
Related recalls
No recalls on record for this model year.
Related investigations
Engine cradle separation
The engine cradle front bolts and/or retainers may fail, allowing the front of the engine cradle to fall, possibly separating the steering intermediate shaft from the steering gear, with complete loss of steering control
EA00011
What 1990 Pontiac Grand Prix owners say
Most recent owner complaints, unedited.
While driving the engine fell. The vehicle was towed to the dealer where it was determined that the retainer cradle broke. Consumer never received a recall notice. *nm
Consumer called complaining about having problem with the engine mounts. Which he replaced at 115 thousands miles and has to replaced again. Dealer has not been notified. Please provide fiurther information. Ts
Motor mounts came loose and engine fell down some inches. Currently consumer is not able to start vehicle.
Consumer was traveling on a side street and was making a left turn when engine had dropped, and she lost control of vehicle. Consumer had the vehicle towed into dealership.
While driving about 40 MPH the engine almost fell out due to rusting of the engine cradle. Driver was able to drive the vehicle safely to a mechanic. Engine cradle and engine mounts was replaced at a repair shop. Place provide any further information.
the federal safety agency CAMPAIGN ID # 97V058000-ENGINE MOUNTS
Cracked engine block at 95000 miles
While driving about 35mph heard a rubbing sound, pulled over, and saw serpentine belt cutting into wiring harness. Bottom of frame where the bushing on the cradle motor is located, completely dropped. Contacted dealer to get vehicle in for repairs.
Rear cradle bolt recall work performed however the front cradle bolts rotted off and were not covered under the recall work.
Questions about the 1990 Pontiac Grand Prix engine
Does the 1990 Pontiac Grand Prix have engine problems?
Owners have filed 16 complaints about the engine of the 1990 Pontiac Grand Prix, 9% of all its complaints.
At what mileage do 1990 Pontiac Grand Prix engine problems start?
Not enough complaints include the mileage to tell.
Was there a recall on the 1990 Pontiac Grand Prix engine?
There is no recall for this problem on this model year.
What year does the Pontiac Grand Prix have bad engine?
The Pontiac Grand Prix model years with the most engine complaints are 2000 (223 complaints), 1999 (201 complaints) and 1997 (180 complaints).
Other 1990 Pontiac Grand Prix problems
Brakes 95Body 25Electrical 17Suspension 13Steering 11Lights 9Transmission 5Seat belts 4Acceleration 3Wheels 2Airbags 1Fuel system 1Seats 1
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