1998 Oldsmobile 98 Engine problems

Bought my 1998 oldsmobile regency in july of 2005 with 78000 miles on it. March of 2006 the check engine light would come on and go off. The coolant was bone dry upon inspection by self. There were no visible leaks. I took it to my mechanic who had to replace the plenum at a cost of $533.00. The plenum had cracked and coolant ran into the #3 cylinder. I then had to have the fuel injectors cleaned at the dealer who charged me $170.00 For that job. Now I have a problem with the anti-theft lock system. My...

My 1998 oldsmobile regency was losing coolant. I could not see a visible leak. The check engine indicator light came on, so I took the vehicle to be serviced. The mechanic found the upper intake (plenum) to be leaking the coolant into the engine (cylinder #3.) The leak was caused due to the fact that the intake plenum is made of plastic. I intend to send oldsmobile a copy of my bill which was $533.32. Why would a company make a part such as this out of plastic? By the way, my indicator light is still on, so I will need to have a dealer check it out, as the original mechanic can find no reason for it remaining lit. *Nm

Coolant leaked out the intake manifold. Had to replaced intake manifold and gaskets. *Bf e-mailed consumer response exhaust gases had gotten into the plastic upper manifold had thermally broke down the plastic and caused the leak. *Sc

I own a 1998 olds regency with 62000 miles on it. This car has the standard 3.8 Liter v-6 which has been in production for probably 30 years. I noticed recently the coolant reservoir level was slightly down and added coolant to bring it up to level. Two weeks later my engine temperature was slightly high so I checked the reservoir level again. The reservoir was dry and I couldn't see any coolant in the radiator. I called the local dealership, added distilled water and got it there. When I arrived there was...

Intake manifold, made of plastic, ruptured dumping coolant into cylinders. Resulted in instantaneous stoppage of engine and loss of power steering. Could easily have led to wreck. *Ak mechanic at first gm dealer contacted diagnosed problem sight unseen as it is a known common problem. Gm strongly suggested having work done at a dealership so they could make "adjustments" to the repair bill. After having the vehicle towed to a dealer, no "adjustments" were made, towing bill was exhorbitant, and repair bill was 30% higher than quoted by independent repair shop. Defective part is available for inspection (in my possession).

The vehicle intake manifold warped which resulted in the engine overheating. *Nlm

Tires wore out every 22,000 miles. Also, engine head gasket blew out, and oil was leaking from underneath the vehicle. *Ak