2.3L ('83-'97) '94 2.3 high idle

[gomerpyle]

My son has a 1994 Ranger with the 2.3 and a 5 speed. He is learning to drive and we got this truck as a project. I have been driving it for about a month to get it ready for him(he's practicing the manual in the pasture). We changed the thermostat out this past weekend due to it not building any heat. Everything went well with no problems. We pulled it out and let it run for a little bit to warm up and hopefully get any air pockets out.
I started to work the next morning and about 100 yards down the driveway it idled up higher than normal (guessing 2kish but don't have a tach). It has stayed in that high idle ever since.
*I looked for any vacuum hoses loose or broken and sprayed parts cleaned with no change in idle
*I checked throttle cable, it is moving freely and returning
*I blocked off IAC with no change
*Testing TPS, I'm getting 4.9, 1.2, and 4.4
What am I missing? Can MA be tested? I am not a mechanic but am trying to learn and teach my son what I can.
Thanks for any help
Daniel

 

[WutUp Clegg]

Have you tried cleaning the MAF sensor? It sounds like it could be a leaking vacuum hose or leaking from around the intake.

 

[gomerpyle]

I have a dumb question, how do I go about cleaning it?

 

[scotts90ranger]

For the mass airflow sensor get some mass airflow sensor cleaner, it's in a spray can, basically electrical parts cleaner but they're the same price so better safe than sorry...

I would start there and take off the IAC and spray it out while you have it and are in the area with tools...

It's most likely either the IAC or a vacuum leak, from doing the thermostat (that unfortunately might not solve your problem, I'm working on a no heat issue on my '97...) there's not a lot of hoses in that area other than the PCV that's in the area of the front of the intake manifold.

 

[gomerpyle]

Didn’t think about it when I made the original post, but we removed the MAF when we were trying to remove a seized bolt from the air box. I’ll get some cleaner and try it

 

[Clos 67]

Location of tcm on 99 Ford ranger XLT