F250 problems
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Joined: Sep 2003
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F250 problems
I have a 1997 F250 4X4 with a 460. My first problem is a funny noise comming from a small hose that runs parallel along the large intake hose. It enters the manifold next to the intake hose. There is a round plastic fittting in the middle of this hose that is hollow inside. This occasional problem coinsides with the truck engine running very fast. My second problem, I have had the radiator rodded out and the cooling system flushed and it still seems to run hot. The truck seems to run best when the gauge is on the N of NORMAL, as soon as it gets to the O its starting to get hot and the transmission shifts at a high RPM. Any help would be greatly appreciated.
Senior User
Joined: Mar 2003
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From: NE TX
F250 problems
Have you checked computer for codes? Reader is available at WalMart for~$25. Does the small hose connect to the PCV filter in the airbox? If the engine is running fast you could have problems with one of several sensors, such as IAC, TPS, etc. Codes could show which one. Was the trans cooler also cleaned and installed properly? Check your ATF level. These trucks run 192 degree thermostat so they normally run toward the O or R and can go higher under load or extreme conditions. The truck should run fine at the O through A level anyway if the sensors are working properly. The "Check Engine" light doesn't always flash if a sensor fails. And the codes do not always point directly to the problem. It is the best place to start though. Good luck.
Postmaster
Joined: Nov 2001
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From: OK
F250 problems
Originally posted by gwconst
The truck seems to run best when the gauge is on the N of NORMAL, as soon as it gets to the O its starting to get hot and the transmission shifts at a high RPM.
The truck seems to run best when the gauge is on the N of NORMAL, as soon as it gets to the O its starting to get hot and the transmission shifts at a high RPM.
As for your engine, it sounds like you might have some kind of vacuum leak. The plastic vacuum lines on my truck are already brittle. Cracks and even out-right breaks are often hard to find as many of the lines are enclosed in 'conduit'. Although, it could be something different on your truck. As described, your intake tubing is very different from mine. Sounds like your truck may have CA emissions.
Posting Guru
Joined: Dec 2002
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From: Billings MT
F250 problems
I would also have to question the heater core. If the heater core is partially clogged, it might cause your getting hot situation. My truck normally runs at the 'N', and occasionally get to the 'R' with a load and up hill, but as soon as I top the hill, it drops right back down to between the 'N' and 'O'.
I, too, think it is probably a vacuum leak. Pull the codes, it should tell you which sensor is not sending the correct values to the comp. Remember, just because the sensor is not sending correctly, it rarely is THAT sensor. The codes just point you in the right direction.
I, too, think it is probably a vacuum leak. Pull the codes, it should tell you which sensor is not sending the correct values to the comp. Remember, just because the sensor is not sending correctly, it rarely is THAT sensor. The codes just point you in the right direction.
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Joined: Mar 2003
Posts: 470
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From: NE TX
F250 problems
You can check the core by bypassing it. Just undo both heater hoses, one from engine other from core. Loop the one connected to the core back to it and connect the other end to the other side. Connect the hose attached to the engine to the other opening. Ideally the hose going in to the core needs to stay attached to the engine but it ends up the same. Just mark the hoses so you can put them back properly later. If the problem disappears, just replace the heater core. I would consider buying a larger aftermarket transmission cooler. They aren't very high and fairly easy to install.
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