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1996 Ford Thunderbird Idles Beautiful, Slow Acceleration
I just got a 1996 Ford Thunderbird from an older couple who kept the car at their Vacation home in Florida and was only driven 3 months out of the year. They had it there for about 8 years, and before that it belonged to an old man who bought it new and used it to put around town at 20 mph. It is just about to roll over to 60k miles. I just replaced the intake manifold, fuel filter, PCV valve, front brake pads and rotors, spark plugs and wires. The car runs extremely well at idle, but when you put your foot down, it seems very doggy at first and only tends to pick up speed in 2nd gear. The likelihood of anything being replaced besides what I just replaced is very slim. The 0-60 time is supposed to be around 8 seconds, and we're getting 18-20 seconds each time. Please help, besides being slow, the car is perfect!
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Before getting involved in a lot of unnecessary work, why not try a tankful or two of premium gasoline and see that makes any difference. If you have already done that maybe it just needs a good run on the pike at the speed limit of course ! This is not an unusual problem with vehicles that rarly go over 25 MPH..
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I would start with checking fuel pressure. With so much down time and possible fuel going stale, the fuel pump may be marginal. You never mentioned which engine you have an idle pressure of 28-54 psi for the 3.8SC and 30-45 psi for the 4.6.I assume you have the V8 since you had to change the intake manifold.I would also check and make sure pressure holds after shutdown and when you work it. Won't hurt to check for any stored coded as well.
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Originally Posted by hanky
(Post 114063)
Before getting involved in a lot of unnecessary work, why not try a tankful or two of premium gasoline and see that makes any difference. If you have already done that maybe it just needs a good run on the pike at the speed limit of course ! This is not an unusual problem with vehicles that rarly go over 25 MPH..
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Originally Posted by raski
(Post 114078)
I would start with checking fuel pressure. With so much down time and possible fuel going stale, the fuel pump may be marginal. You never mentioned which engine you have an idle pressure of 28-54 psi for the 3.8SC and 30-45 psi for the 4.6.I assume you have the V8 since you had to change the intake manifold.I would also check and make sure pressure holds after shutdown and when you work it. Won't hurt to check for any stored coded as well.
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Originally Posted by Ethan Bogart
(Post 114165)
I just checked fuel pressure from the fuel rail on the driver side and got 35 psi from idle and 40 when revving up. And yes, it has a 4.6 V8. So what you're saying is that when I shut down the car it should hold fuel pressure at the rail?
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Originally Posted by Ethan Bogart
(Post 114059)
I just got a 1996 Ford Thunderbird from an older couple who kept the car at their Vacation home in Florida and was only driven 3 months out of the year. They had it there for about 8 years, and before that it belonged to an old man who bought it new and used it to put around town at 20 mph. It is just about to roll over to 60k miles. I just replaced the intake manifold, fuel filter, PCV valve, front brake pads and rotors, spark plugs and wires. The car runs extremely well at idle, but when you put your foot down, it seems very doggy at first and only tends to pick up speed in 2nd gear. The likelihood of anything being replaced besides what I just replaced is very slim. The 0-60 time is supposed to be around 8 seconds, and we're getting 18-20 seconds each time. Please help, besides being slow, the car is perfect!
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