Im working on a '93 pontiac trans-port van with the 3.8l motor. Its my neighbors car and he broght it to me cause the muffler has a hole in it but i noticed it wasnt running smooth at all. turned out that one of the coil packs wasnt making spark at all. I got him a new coil pack and changed all the plugs, and it runs way better now, but there is still a hesitation/miss at about 1500-2000 rpms when revving the motor up quickly. It idles smooth and if you give it gas slowly it accelerates smooth. but "stabbing" the gas makes the engine stumble, and sometimes the check engine light comes on. this almost feels like a miss but i thought at first it was a fuel starvation prob. i checked fuel press and there is 40 lbs., even when this stumbling is happening. I jumped the obd connecter pins and got the check engine light to flash the codes. ive got code 12 and code 18. 12 is just the self check code which you disregard but looks like 18 is for crank or cam sensor. IF i had a bad cam sensor the motor would not start, so this could be the crank sensor? also im wondering if dirty fuel injectors could be the cause. the car has
160K miles on it.- posted
16 years ago