That's expensive for that. I would do myself if I was you.

 

Well I did end up picking up the truck and just paid them for their diagnostic fee.
I just took out the IAC and cleaned it, and cleaned the throttle body. Both obviously had some residue but nothing that would have caused any issues, the truck only has 89K miles. And I know I keep saying this the truck was running fine up until the puddle.
Well needless to say - the cleaning didnt help the situation.
I think I confirmed for myself there are no vacuum leaks. I took the air box off and large air diverter (or whatever that big plastic box is that connects to the TB is called)
off and started the truck. I blocked the vacuum line on the air box and blocked the opening of the TB. The truck started to stall so I assume if I had a vacuum leak
it would have kept running.
Well I will order a new IAC and install it and hopefully that will solve my problem. Maybe somehow the water came in the air intake and froze the plunger inside the IAC.
I am surprised as well that the IAC code P0505 is not set if it is truly bad.

 

So I just put in the new IAC valve - NO CHANGE. Not surprised as when I asked the Dodge service manager if he was guaranteeing the fix he could only state
it would fix the IAC valve. The old one looked pretty clean and the only way water could have effected it is if water came in the air intake and went internally into the valve or if the fan sloshed some water on the IAC valve externally and either expanded or contracted something. In that situation I wonder what temp the valve body is under during normal operating temps and then what happens if you dump 52 degree water on it?
I really dont think my original one is bad. This was just a starting guess for Dodge at my expense. So in the end I guess i "saved" $200. If I cant figure this out I will bring it
to an independent shop next.

Oh well I guess its time to get the dremel out and work on the stripped T15 torx holding in the MAP sensor or just see if I can get a small straight blade to catch. Also it looks like the LEFT stud the MAP sensor sits on is just a POST? Not another T15 torx bit, Can anyone confirm that?
If its supposed to be a bolt maybe the head sheared off and thats my problem but it looks like it has some sort of post tip on it. Plus I assume the engine vacuum is sucking the MAP sensor in anyway. Im sure it probably doesnt need any bolts as the vacuum sucking pressure I felt to test for any vacuum leaks was quite strong.

 

I am trying to think from the point of the force and location of water. I am beginning to wonder if maybe a ground wire could have been ripped off the truck or something off the transmission case that would create this problem?

 

Gotta be a vacuum leak, or failed sensor somewhere. If the PCM data looks right..... could try unplugging various sensors with the engine running, and see what happens. Keep in mind, unplugging cam, or crank sensor, will likely kill the engine outright.

 

So far Ive swapped out the MAP, TPS, IAC, and installed new spark plugs.
removed and cleaned TB and installed a new gasket.
Compession test indicates all cylinders are fine.
Still have high idle. Could not find a vacuum leak.
Could the PCM be bad, and if so how could I test that?

 

Do you have a scanner that will read live data? You need to be able to see what the PCM is seeing.

 

yes i do have a live data scanner. What should I be looking for?
I know rpms, IAT, ECT data seems to be fine.
Could the O2 sensors cause this kind of a problem?
and if so could they have been damaged by running at normal operating temp and then getting a bath in 50 degree water?

 

O2 sensors shouldn't matter.

Need to see what the PCM is getting from the sensors. MAP, TPS, Coolant Temp, etc. Also see what it is reading for Engine RPM, and Target idle.

 

outside air temp this morning is 63 degrees according to my outdoor thermometer

_________________________________ECT____ MAP ____IAT ___TPS____ RPM

on a cold non running engine __________63 _____29 inHg__ 63____ 11.0 %___ 0

at startup__________________________63 _____14 ______63 _____11.4 ____1525

at engine coolant at approx 200 degrees 194 ______9 ______75 _____11.4 ____1660

the TPS changes when i step on accelerator, live data rpms match dash tach