I’ve only had my 05 PSD Ex for a few months. It’s got 127K on it. When I first got in the winter, I didn’t think much of having to let it warm up several minutes before driving anywhere, since not doing so would result in it not exactly ‘wanting’ to shift out of first gear and I knew it was good to let it warm up just anyway.

Now that it’s summer though, I’m still having the same sort of issue. It just doesn’t like not being warmed up. When it was 90 out the other day, it took the better part of a mile to begin idling smoothly and to begin shifting at the proper points – AFTER letting it idle a good 30 seconds after startup.

Is there something that I can do about this or is it considered normal? I am planning on changing the trans fluid and filters this weekend in hopes to make a difference that way.

 

there could be a lot of things that will cause that, Idle air control, TPS, coolant sensor, mass sensor, vacuum leak, EGR etc. is the check eng light on,
have the truck Diag by a pro at a shop , scan for codes, with that many miles, a lot of things could be wrong, newer trucks are impossible for the back yard mech to work on now days, unless you have the proper test equipment and training, just my 2 cents worth, Take care, Chellie

 

Wonder if the thermostat could be stuck too. There are just too many things to diagnose here, like Chellie said. Get it to a shop, hook it up and see where you're at. Just too many variables to throw in to the mix, would be diagnosing it yourself under a tree for weeks before figuring it out. Unless you're one lucky guy.

 

It's helpful to know that my experience isn't normal - thank you!

There isn't a check engine light on, no.

Just some extra info - If I don't let it warm up before driving, fuel economy takes a MAJOR hit. Not sure if that helps diagnose things or not.

Are codes set if the Check Engine hit never has come on? Is there a key off/key on sequence that allows you to check the codes yourself by counting flashes of the check engine light? I remember that being possible in the older Fords...

 

Older vehicles had the OBD1 and newer Vehicles have the OHD2, with the OBD1, i belive you could use a jumper in the test plug to make the ck eng light flash, I dont think you can with the OBD2, a proper scan tool is required, you can buy a simple scan tool to check for hidden codes, but the OBD2 system stores a lot of valuable information, that can really help to diag the problem, and the simple scan tools just dont have the electronics built into them to use this info, a snap on , OTC, etc scaners are needed, and they are Big Big Bucks, Diag Scan tools are a must now days with newer vehicles,
I am a Female Fleet Equipment Mechanic, with my own newer vehicles, I take them to the shop to be Diag and repaired, because i dont have the thousands of dollars of scan test equipment to properly Diag/Test my own vehicles with, and i will not spend all that money for test equipment, when its cheaper for me to just take it to a shop that has made the investment for scan test equipment, and they are up to par with the factory training. I have been to ford and chevy factory training classes for OBD1 and OBD2, and everything keeps changing, updates are needed every year for newer vehicles, Thank Goodness i am retiring this July, 35 years as a Fleet Equipment Tech Take care, Chellie