I recently purchased a 93 Dakota 5.2l v8 2wd xt-cab with over 200,000 miles on it.The only things that don't work on her are the cruise control and the o/d.Mods include dual headers,heavy duty battery,coil pack and k&n lifetime filter.

When I bought the truck it was reading a 12 and a 32 on the key turn diagnostic check but it was driving fine for the first or so.I used a spray engine cleaner making sure to avoid any electrical connections and throttle body.I noticed a major build up of gunk on the tb valves so I used a spray tb cleaner to remove it.

Problems: I noticed after the cleaning that she was idling high around 1000,1100 rpm in park and 800 in gear.200 rpm less when the a/c is on. Also, while driving I hit around 20-25 miles an hour and I can take my foot off of the gas and it maintains that speed.The idle doesn't change cold or hot.The temp gauge never goes above 1/4 until she has been running for a long time(over 20 minutes).

I have replaced the IAC(thoroughly cleaning the port before installation)TPS and Intake air sensor(disconnecting the battery prior)with no change.

Questions: Is there a "shade tree" way to test the vacuum system for leaks other than spraying wd40 on the vac lines? Could the coolent temp sensor and switch cause the high idle? Are there any other issues that could cause these symptoms?

 

I believe code 32 is EGR. That can cause you problems. You can try getting a vacuum guage and see where your at. Normal is around 18. You can also disconnect all vacuum lines from the engine and take a reading. Then plug all lines back in then see what numbers you get.

 

Thanks for replying, it was showing that code when I bought her and she was running fine then. Everything I've read says that the egr would cause rough and erratic idle not fast idle or hanging on the throttle while driving. Is it possible for these symptoms to take over a week to pop up? What is it about the egr that would cause high idle?

I just replaced the temp sensor,switch and tstat.All were in Very bad shape. I took her for a 15-20 minute spin but the problems are still there.

On another note, is it true that if you put her in gear and hold the brake in the engine will try to staul if there's a vac leak? It really feels like a vac leak but I can't seem to find it.

I just got this truck and she has so much potential.I can see what she'd be like with alittle work.I really appreciate any input you may have and I'm sorry for having so many questions.I guess I've already kinda bonded to her and it's very frustrating when she isn't doing well.

work performed so far:
replaced pcv valve
replaced tps
replaced iac
replaced air intake sensor
replaced temp sens and switch
replaced tstat
banged head against the wall repeatedly

On the plus side, everything that I have done REALLY needed to be done and every step has made her run better.

 

May or may not help but the hanging throttle caught my attention. Spray some good lubricant on the throttle cable and work it a bunch of times. Could be that the cable is getting caught somewhere in the sleve(usually right at the end), and it it causing both problems. My bronco had a similar issue, only it tended to get stuck at full throttle....and with a chipped/modded 351 and 4.56 gears thats a very very bad thing.

 

Here is what the FSM says about the EGR system:

 

Wow!! Ok, so it is quite possible that the egr is causing my problem.Is there any way to clean it or bypass it without gumming up the works?

That was the last thing I'd think of because, like I said, it was blowing that code before and the truck was driving perfect.

 

I have a 94 with the exact same problem. I hope somebody can help.

 

Could I call you on this problem. I think it would be interesting to compare notes.

 

What is your problem? The Hight Idle or the Code 32 or all of what the OP said. It is always best to post up a new thread with YOUR info instead of pulling up an old post with someone else info.

For diagnostic of the EGR system take a look above. Also we have the service manual in the FAQ in this section.

 

I had the same problem with my 92 3.9L. When i bought it the air filter was so gummed up with dirt, grass and even a small birds nest. After i cleaned everything out and put a K&N performance on it. It started better then before but the idle stayed at 1500 and wouldn't drop. So i heard about dissonecting the battery for a long period of time or over night it will reset the computer. Once i reconnected the battery and started her up. The idle returned to normal and it's been fine ever since. Just a idea :P