1994 Ford Ranger 4.0 auto trans 4x4 engine runs fine cold, however after setting for 15 min at normal temp the engine runs ruough after restart untill it run for 3 to 4 min than runs normal. engine vac is 15 inch, fuel preshur is 30 lbs at idel, iac is new throttle body has been cleand, pcv hoes is new as is the pcv, all vac lines ok?? trouable code 137 engine run test #2 bank rich?

Check the engine coolant temp sensor. That can cause temp related problems. It is 67 in the picture, has circle around it. It is in the heater water tube, which in turn is connected to thermostat housing. The hard restarting may be because it is trying to flood? Any applicable trouble codes? Don't replace anything unless your testing points in that direction.

if you are in stop and go traffic this is some what normal in those temps. the compressor gets to working in overdrive.

have auto zone run a scan on the truck its free overheating you need a seperate cooler for you trans pulling trailer put a high load on trans this will make the trans last longer and run cooler I would put the cooler as low as possible in the very front of your radiators

Assuming you are talking about a 4r55e tran
with the 4x4 deep tran pan.
and the tran was rebuild with new torque converter
about 2 gal 8qt

It sounds like your thermostat is stuck open, not allowing the engine to warm up enough.

this may sound funny but i had an old dodge car that did that exact thing....turns out that i had to replace or repair the ground straps and also the cables to the battery and starter....it was fine after that.

I would recommend taking it to another tranny shop. Because if the tach is higher than normal then more than likely its slipping. Eather way what ever it is. I wouldnt wait till the last min, because it could be just the tranny pump and if so then it can be saved before it wrecks havoc on the tranny.

LOW COOLANT TOP OFF With cap off after Idling fro 10-15 mins with haet temp selector switch on HOT

I have a 1994 Ford 4x4 6 the trans has starting to act funny when cold won't go in drive for about 5 min, also takes a long time to change gears after gets warm. I'm changing fluid and filter to see if that will help.. Any help is much needed thank you
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i had the same problem after spending $500.00 for toyota to look at it they didnt fix it and suggested i it was the auto trans and i should get it overhauled costing thousands. i didnt believe them and started to do some of my own research into the problem. the coolant temp sensor at the rear of the intake manifold tells the ecu when the engine is at correct operating temp then allows the auto trans shift into overdrive. to rule out any problems with the auto trans i disconnected the plug to the temp sensor and went for a drive when the engine was cold and it shifted straight away into overdrive no problems. you can't leave this disconnected because the engine is hard to start when cold as the temp sensor also tells the ecu that it is cold and allows the cold start injector to inject more fuel into the engine on cold start up.to overcome this i cut the wire to the sensor plug and installed a switch which i installed into the centre console.now i start the car flick the swith use overdrive then swith back to normal after car has warmed up . engine fault light appers on dash when switched on but doesnt matter. i have had this modification for 2 years now no problems.