1993 Oldsmobile 98 Q&A
1993 Oldsmobile 98 Question: Car hesitates and sometimes stalls after reach operating temperature.
After the car has reached operating temperature, the care will hesitate and sometimes stall when accelerate hard, stomp on the pedal. It doesn't do it if accelerate slowly, less then halfish throttle. It also will try to stall when braking heavily. These problems do not generally occur until after the engine is above about 180 degrees. It is the 3.8l non-turbo engine. I have replaced fuel pump, TPS, computer, mass air flow sensor, all vacuum leaks, spark plugs, and checked the wires. The only other thing I can think of to check is the actual fuel pressure, no gauge of my own, and the fuel injectors. I also have pinned out the diagnostic port to check codes and only ones I got were fixed with TPS and computer switch replacement. It also gets worse the lower the gas is. Any thoughts or suggestions are greatly appreciated! - apollo63740
Check for water in gas!..... Pull fuel filter and check..... Water should be in it ... IF present! - pushrod
I have a 1991 Olds 98 with the exact same symptoms! I found this site while researching my problem. I was going to check the TPS, but it looks like that may not solve the problem. My car never feels like it's going to stall while at idle, although the idle is slightly rough. Like you, if I accelerate smoothly, things are OK, but if I push down on the pedal around 45 mph or so, I get a hesitation and can actually hear a small backfire if I push really hard. After I slow back down, I'll do it again and it seems OK. About 2 years ago I replaced ICM, coil, plugs and wires, so I figure I have the spark side of the equation covered. I'm close to giving up and taking it to my mechanic and paying $115 to get it diagnosed. If I do, I'll report back. I'm figuring a fuel problem this go 'round. - jas72