Engine/transmission issues potentially?

[CallMeMatt]

So a little back story:

as many of you know, tornadoes and flooding beat the crap out of the southeast Sunday night. I was leaving a storm shelter and hit a few large puddles (it was tough to see due to rain and I hit one of them at about 20mph). Once I got on the main road to my house, the car got to 2000rpms in first and shifted smoothly to second, then in second, the car got to 2100 rpms and dropped down to 1000 abruptly, then quickly shot back up to 2100... this happened multiple times. my O/D OFF light started flashing.

just to check that this wasn’t a one-off ordeal, I put the car in park when I got home, and pushed the gas to 2100 slowly, once it hit 2100, the RPMs fell and quickly came back up. I cannot get the car to exceed 2100 rpms.
I checked the distributor (my first thought)- dry
I got under the car with a light and it looks like my speed sensor is just a little loose, but I couldnt pop the connection easily so i didn’t bother to check the connection.

I will dig in more in the morning, but does anyone have thoughts?

EDIT: 1993 FJ80 FZ-FE engine

 

[baldilocks]

You may have water in the MAF (VAFM 1993-1994) wire connector. Do not remove those two screws retaining the male part of the connector to the module, you will damage the internal solder connections.

 

[CallMeMatt]

You may have water in the MAF (VAFM 1993-1994) wire connector. Do not remove those two screws retaining the male part of the connector to the module, you will damage the internal solder connections.

Would I just pull the hose and spray out with an air compressor then?
I apologize about being fairly green when it comes to repairs and diagnostic

 

[BILT4ME]

Would I just pull the hose and spray out with an air compressor then?
I apologize about being fairly green when it comes to repairs and diagnostic

I'll bet money on the O2 sensor wire connections got wet.

Pull them apart and blow out with compressed air (or canned air)

Pick up some dielectric grease from Auto parts store and smear it around the connection to hel seal it. Don't place it on the pins, as it is made to stop electrical connection.

 

[ppc]

The O/D flashing indicates a transmission fault has been detected. It is similar to the CEL for the engine. There is a procedure in the FSM to determine the fault code. That said obviously you have multiple problems most likely caused by water intrusion into multiple wiring connectors and devices such as O2 sensors, distributor, spark plugs etc. Time to take some of the connectors apart and use compresses air to get ride of any moisture and protect them with dielectric grease.

 

[baldilocks]

Would I just pull the hose and spray out with an air compressor then?
I apologize about being fairly green when it comes to repairs and diagnostic

I’m talking about the wire connector. It’s time to buy a factory service manual and do some research here at the Mud archives. Seems like you may have more than one issue to resolve.

 

[CallMeMatt]

I’m talking about the wire connector. It’s time to buy a factory service manual and do some research here at the Mud archives. Seems like you may have more than one issue to resolve.

that’s my bad, late at night poor reading. I’ll hop in tonight after work and check my connections

 

[Tachycardic]

If you got water in to the VAFM connector, you have other issues. That VAFM sits up high; you'll get water in the air filter before that connector gets submerged. But I agree with the other...you need to pull plugs and connectors, dry them out and apply di-electric grease. Could it be something else? yes, but go for the low-hanging fruit first.

Hope everyone is okay. Hell of a storm.

 

[CallMeMatt]

Started the car this morning, ran fine for 10 mins or so then it started happening again. OD light is no longer flashing (no trans issue). I pulled the engine code and it gave me a code 12, “engine revolution signal missing“, as well as the code I have known about for a while (EGR).... I’m quite unsure what that means, I’ll be pulling the connections and adding grease tonight

 

[BILT4ME]

Started the car this morning, ran fine for 10 mins or so then it started happening again. OD light is no longer flashing (no trans issue). I pulled the engine code and it gave me a code 12, “engine revolution signal missing“, as well as the code I have known about for a while (EGR).... I’m quite unsure what that means, I’ll be pulling the connections and adding grease tonight

The revolution signal points to crank position sensor. It would have been submerged and have a fair amount of water drag on the harness. It's at the bottom front if the engine.

Check the connection like the rest.

 

[ppc]

A 93 model does not have a crank position sensor, only found on ODB2 engines.

 

[BILT4ME]

A 93 model does not have a crank position sensor, only found on ODB2 engines.

Where does the ECU receive it's signal from for rpm? Same for tach. Maybe start there.

 

[retrofive]

Seen water get into the sparkplug if not sealed good and water in the distributor. Both can cause weird issues.

 

[CallMeMatt]

update: it was my vehicle speed sensor connection that had the issue. all is good now.