Which parts fail
Components named in complaints (engine, cooling system, oil leaks, timing chain, exhaust).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 1999 Oldsmobile 88 owners, lightly cleaned up (personal details are redacted by NHTSA).
1999 Oldsmobile 4.8l engine will shut completely off unexpectedly while driving. This occurs both at highways speeds of 65 MPH or at slower speeds of 35 or 35 MPH. All of the power assisted features such as power brakes and steering also stop working when the engine stops. The engine shutting defect does not occur daily and is unpredictable. The only check engine code present was a "EGR valve" code. The EGR valve was replaced at the cost of $344.00. The engine shutting off unexpectedly defect has continued to occur after the check engine repair was completed. This is an extreme safety issue that appears to replicate the GM ignition switch recall that this VIN is not included in. From "googling" this defect it appears to affect a large number of similar vehicles with 3.8l GM engines and electrical systems.
Tl* the contact owns a 1999 Oldsmobile 88. The contact stated that while traveling 55 MPH, the check engine warning light illuminated as the engine overheated. The vehicle was towed to the dealer who confirmed that the failure was caused by a hole that had melted in the intake manifold, causing coolant to leak into the manifold. The manufacturer was not contacted. The vehicle was repaired. The failure mileage was 72,602 and the current mileage was 73,102.
Intermittently while driving at any speed and with out any warning vehicle stalled. Also, while pulling in to a parking lot vehicle jumped forward, and the engine compartment exploded. Dealer repaired the problem, but stalling and surging still occur.
I brought my car in to the dealership for an oil leak and while there the mechanic also checked the coolant level. It was low. He pressure tested the system and found the coolant cap to be not sealing properly. I paid for my repairs and left. The next morning the check engine light came on. I brought the car back to the dealership. They found the engine was misfiring. They checked the coolant level again and it was dry. The intake manifold had melted and coolant had leaked into the engine and was consumed by the engine. Now I need a new intake manifold, gaskets, spark plugs, wires, and an oil change to the tune of $800+. I have searched on the internet and found many similar complaints. Why does GM not do anything. The intake manifold was plastic. Plastic does not belong in an engine. I hope you make them recall this.
I experienced stalls and power surges. Dealer replaced fuel pressure regulator due to recall. Six months later car reached extremely high temperature then died. Mechanic replaced cracked plenum. Gaskets, pipes, assembly, seals and sensor resulting in $1234 repair bill. Contacted GM and got full reimbursement as vehicle has only 37,000 miles on engine. Less than 250 miles after repair, engine produces loud knocking noise and loss of power while driving home from town 90 miles from home on July 4th. Mechanic says one of the pistons/rods is bad, more then likely a result of the previous problems. Have not been successful in reaching the extremely helpful customer service representative I was dealing with from GM but I will not drop this! Last quote for current repair was $1100.
Was driving my 99 olds 88 up a hill in tn and it started to shake and lose power. The check engine light came home and the engine was excessively hot. All of the radiator would take the fluid but nothing would leak out. I pulled the car over and waited for it to cool down but then after the 3rd time trying to start it, it made a clunk noise and wouldn't start any more. I was told it was a hydraulic lock up. Car sat for 5 months and finally got the money to have it towed to a collision center to have it looked at. I wish to be reimbursed after it is fixed.
I have replaced the plenum in my 1999 Oldsmobile 88 twice now!!! I have a 3800 motor in it with 107,000 miles on it. I have talked to many people that have had to replace their plenums also and my mother had to change hers with 40,000 miles on her car! The plenum is made of plastic and is junk!!! GM needs to step up and take care of this problem, I have spent over $1,000 fixing this inferior part! I own 3 GM products and I will never buy another if GM does not take responsibility for this!
Automobile ruptured intake manifold. GM then acknowledged through a recall that this was caused by a fuel pressure regulator and GM would take care of the repair bill. My olds did just this and my dealer said that the pressure regulator could cause the intake manifold to rupture. GM refuses to help me. My VIN is [redacted]. You folk should make GM take care of this. Updated 07/24/2012
I have a 1999 Oldsmobile 88 bought it in September 2003 then in March 04 the engine blew due to loss of coolant. There was no indication that it lost coolant. Now a year later, March 2005, the engine lost it's coolant again and needs to be replaced . The car never went over safe temperature. Called GM when it happened the first time. No help at all. I think there must be aproblem with these engines.
The vehicle stalled while driving. When this occurred, the vehicle lost power steering and brakes. The vehicle was serviced several times by the dealership and the fuel pressure regulator recall 04V090000 repairs were performed, but the stalling still occurred. The consumer took the vehicle to another mechanic and they that the crack shaft position sensor was bad
NHTSA investigations
Engine compartment fire
By letter dated March 12, 2008, general motors corp. (GM) has notified the agency that it will conduct a safety recall (identified by NHTSA recall number 08v-118) to address a defect in approximately 207,542 model year (my) 1997-2003 Buick regal gs and Pontiac grand prix gtp vehicles equipped with the l67 supercharged version of GM's 3800 series ii v6 engine.the recalled regal gs vehicles were built from August 1996…
Engine complaints in other 88 years
Frequently asked questions
How common are engine problems on the 1999 Oldsmobile 88?
NHTSA has 33 complaints about the engine & cooling of the 1999 Oldsmobile 88, 43% of the model year's 77 complaints. The component named most often is engine › gasoline (12 mentions).
Is there a recall for 1999 Oldsmobile 88 engine problems?
No. NHTSA lists no engine & cooling recall for the 1999 Oldsmobile 88, though it has 2 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 1999 Oldsmobile 88 engine problems start?
Half of the complaints with a recorded mileage happened before about 92,000 miles.
Is it dangerous?
Owners linked 0 crashes, 8 fires and 0 injuries to engine & cooling problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.