87 problem
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87 problem
I have an 87 f250,it starts and idles fine. I drive about 4 blocks and it starts to "buck" I let off the gas it stops bucking. I get back on the gas it does it again. I've had a heck of a time. Does any one else have a suggestion?
New User
Joined: Oct 2013
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The first thing I would look at is fuel pressure. If your 87 is EFI (I don't know if Ford went EFI in 87 or if it was 88), test the pressure on the fuel rail, if it is low (I wish I knew the psi to look for. Engine size might matter), then look at the filter, and then the pumps starting with the high pressure pump on the frame rail, moving to the in tank low pressure pump(s).
Sorry I'm not much help. I'm sure you will get much more detailed answers from the experts on here. I'm still learning about my 88 f250 I've only had for a couple weeks.
Sorry I'm not much help. I'm sure you will get much more detailed answers from the experts on here. I'm still learning about my 88 f250 I've only had for a couple weeks.
Fleet Mechanic
Joined: Sep 2013
Posts: 1,504
Likes: 8
From: Indian Falls, New York
The first thing I would look at is fuel pressure. If your 87 is EFI (I don't know if Ford went EFI in 87 or if it was 88), test the pressure on the fuel rail, if it is low (I wish I knew the psi to look for. Engine size might matter), then look at the filter, and then the pumps starting with the high pressure pump on the frame rail, moving to the in tank low pressure pump(s).
Sorry I'm not much help. I'm sure you will get much more detailed answers from the experts on here. I'm still learning about my 88 f250 I've only had for a couple weeks.
Sorry I'm not much help. I'm sure you will get much more detailed answers from the experts on here. I'm still learning about my 88 f250 I've only had for a couple weeks.
Post Fiend
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The engine is 300 efi, I changed parts to correct the bucking. I purchased another 300 thinking I might change the old one out.
I even had the valves replaced.
I even had the valves replaced.
Cross-Country
Joined: Sep 2013
Posts: 64
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From: boonies, central TEXAS
Similiar problem
I had this happen recently on my car. It was a frayed wire in the ignition system. Tedious work, but go through your wiring carefully and look for problems. Even if you have to use a multi-meter to check for continuity.
Logistics Pro
Joined: Mar 2005
Posts: 4,698
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From: Mexico, Missouri
Info is still quite vague. What is running fuel PSI?
Have you checked the TFI module? I know on the older trucks, the TFI is located on the distributor. On later trucks, the TFI module was relocated to the driver side fender, with a heat sink.
Have you checked the TFI module? I know on the older trucks, the TFI is located on the distributor. On later trucks, the TFI module was relocated to the driver side fender, with a heat sink.
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