montanaman
NAXJA Forum User
- Location
- Western Montana
Hey: I got an '89 Ford F250 with the 5.8L (351) V-8 with 282,000 miles last winter for $1000. I'm hoping my XJ brothers can help out with a problem:
It's showing the classic symptoms of vapor-lock. When I start the truck cold, it runs great, and will keep running great for hours, no matter how hot it is outside. BUT ... if I let the motor warm up, then stop it and let it sit for 5 or 10 minutes or so, it has problems. It will start up again with no problem, then cough and die after about a minute. This happens a lot when I take it to run errands.
It's definitely a fuel starvation issue. When it starts to cough like that, I can take my foot off the gas, and it will "catch up" and run again -- and keep running as long as I'm real light on the pedal. But if I floor it, it will surge and then die for sure. It will do this several times after it's been sitting, then return to normal operation.
When it's running properly, it's runs really fantastic -- silky smooth. So I don't think it's an issue with the injectors or the ignition.
Here's some more info:
- Previous owner said it's done this ever since he got it 2.5 years ago.
- Gas comes from a high-turnover gas station. I use the same gas in my XJ with no problems.
- Dual gas tanks ... does the problem with both tanks.
- Fuel pumps in each gas tank, plus another fuel pump on the fuel rail (3 total).
- Fuel pump on the rail has been replaced.
- Fuel pump relays have been replaced.
- Ignition module has been replaced.
So whaddaya think? What does this sound like to you? Any suggestions for a solution?
Thanks!!
It's showing the classic symptoms of vapor-lock. When I start the truck cold, it runs great, and will keep running great for hours, no matter how hot it is outside. BUT ... if I let the motor warm up, then stop it and let it sit for 5 or 10 minutes or so, it has problems. It will start up again with no problem, then cough and die after about a minute. This happens a lot when I take it to run errands.
It's definitely a fuel starvation issue. When it starts to cough like that, I can take my foot off the gas, and it will "catch up" and run again -- and keep running as long as I'm real light on the pedal. But if I floor it, it will surge and then die for sure. It will do this several times after it's been sitting, then return to normal operation.
When it's running properly, it's runs really fantastic -- silky smooth. So I don't think it's an issue with the injectors or the ignition.
Here's some more info:
- Previous owner said it's done this ever since he got it 2.5 years ago.
- Gas comes from a high-turnover gas station. I use the same gas in my XJ with no problems.
- Dual gas tanks ... does the problem with both tanks.
- Fuel pumps in each gas tank, plus another fuel pump on the fuel rail (3 total).
- Fuel pump on the rail has been replaced.
- Fuel pump relays have been replaced.
- Ignition module has been replaced.
So whaddaya think? What does this sound like to you? Any suggestions for a solution?
Thanks!!
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