I have a 1991 Grand Marquis with the 5.0. Totally stock with 80,000 mile on her. The car was running great but the tranny was giving me fits this summer. Had a shop look at it and they recommended a rebuilt tranny as the original one was slipping and, in general, just tired. I bought the car from the stereo-typical little old lady down in California who probably drive the car everywhere in OD. Anyway...
Had AAMCO rebuild the tranny in August and drove it for about two weeks and it started to slip again. Back to the shop and they replaced the torque converter, some sort of transmission pump, and cracked the trans open to look inside. So here is where is gets weirder. They had the car for about a month because they could not figure out why it was still slipping a bit. They couldn't figure it out and told me that it was probably the engine. They kept on and on about the intake manifold but they never tested their theory. They just gave me the car back and said, "Let's us know because we are stumped!"
Here is what the car is doing. At idle with the car in D, it will move forward but has a hesitation to it, like a very minor bucking. Like the motor is missing or the trans is slipping slightly. I don't think the engine is misfiring, hard to tell other than the symptom I described. Give the car just a bit of throttle and the problem goes away. At speed, if the car is just above idle, it will do the same thing. A slight bucking. Give just a bit of gas and the problem goes away. At highway speed, you generally need more than just above idle and there is no problem. Around 30-35 though, it is pretty pronounced. I haven't felt the trans slip since the second rebuild. I don't think it is the trans. AAMCO says they checked everything even the TV cable.
I have done a smoke test and replaced the EGR valve. I don't see any obvious vacuum leaks but I could be missing something as it is like a snakes wedding in the engine compartment. No trouble codes show up on the engine analyzer. It gives me 13 I think. Which is all good. I think it is 13. Whatever. It is the code for all good.
Any thoughts? Other than never having AAMCO do the tranny...
Thanks!
Marcus
Had AAMCO rebuild the tranny in August and drove it for about two weeks and it started to slip again. Back to the shop and they replaced the torque converter, some sort of transmission pump, and cracked the trans open to look inside. So here is where is gets weirder. They had the car for about a month because they could not figure out why it was still slipping a bit. They couldn't figure it out and told me that it was probably the engine. They kept on and on about the intake manifold but they never tested their theory. They just gave me the car back and said, "Let's us know because we are stumped!"
Here is what the car is doing. At idle with the car in D, it will move forward but has a hesitation to it, like a very minor bucking. Like the motor is missing or the trans is slipping slightly. I don't think the engine is misfiring, hard to tell other than the symptom I described. Give the car just a bit of throttle and the problem goes away. At speed, if the car is just above idle, it will do the same thing. A slight bucking. Give just a bit of gas and the problem goes away. At highway speed, you generally need more than just above idle and there is no problem. Around 30-35 though, it is pretty pronounced. I haven't felt the trans slip since the second rebuild. I don't think it is the trans. AAMCO says they checked everything even the TV cable.
I have done a smoke test and replaced the EGR valve. I don't see any obvious vacuum leaks but I could be missing something as it is like a snakes wedding in the engine compartment. No trouble codes show up on the engine analyzer. It gives me 13 I think. Which is all good. I think it is 13. Whatever. It is the code for all good.
Any thoughts? Other than never having AAMCO do the tranny...
Thanks!
Marcus
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