I need help with my 1992 Toyota 4runner. It is an automatic trams and has been having some troubles lately. It doesn't like to shift into overdrive, but it will. It gets up to 4000 rpms and stays there for a while before it will shift. All other shifts are fine it's just into overdrive. Today when I was on my way home from work it shifted to overdrive how it usually does but it kept downshifting me as if I were going up a steep hill and then shifting back up( all at a constant throttle). It did this over and over again all the home until I just turned the overdrive off. My o/d light flashes and the check engine light is on. I can't read any codes because the plug on the car is full of gunk. Idk what the p/0 did but it won't read any codes. At first I was thinking it was vss but now I'm not so sure. Odometer and speedometer don't work.

 

Uh, Skatehard you have created 3 threads pertaining to your trans problem.

First thing you need to do is clean the gunk out of there, (not to difficult) Ya gotta find out what codes are stored before you start guessing.

 

Get the gunk cleaned out and then check for codes. I bet its a sensor problem. You just need to find out which one.

 

Ya it kept telling me it was a duplicate so I thought that meant their mad a thread with the same name. Sorry. Clean it out? With what? I'm just gonna go to a junk yard get a new plug and splice the damn thing on there. Would that work?

 

I've been told that just the fact that the plug is bad could cause problems in the computer and electronically controlled transmission causing my problem. Could it be that the plug is the whole problem?

 

Dude, Don't start throwing parts at it you will just get more frustrated.
Take some q-tips and clean out the gunk. Mine has gunk in it and I can still check for codes.

 

Ya for sure. How would you go about cleaning it though?

 

Q-tips, a rag, tooth pick, a twig, blow nozzle on a compressor, (low PSI) paper towel wrapped around a paper clip. It's pretty simple as I've already stated.

 

First things first... Anytime u start having tranny shifting problems on any car with a decent amount of milage and tranny shifting issues.... Drain the oil and change the filter .... That's a cheap way to assure its not going to drive u crazy looking in all the wrong places : )

 

He's got a check engine light on, I'd be checking for codes before I start changing fluids.

 

Ya exactly. And too, it hasn't been long since the fluids/filter were changed. The used car place I bought it from a Month ago or so did Most of your general maintenance. Thanks for for the help, ill clean it and see if it will throw any codes but I'm kinda expecting a malfunctioned plug. I guess We will see.

 

I cleaned it out but obd1 diagnostic readers are a hard thing to come by. Local part stores don't have them.

 

Here's a pic of diagnostic port you should have one of these on your rig.

What's with the reader your talking about?

 

Yes, the diagnostic port. That is what I'm talking about. Its full of some white crap. The obd1 code reader, You plug it into your diagnostic port and it reads your codes. The obd1 is pre1996 and since mine is a 92 I need that one. They are hard to find. Mechanics or dealers are about the only place I have found one, and that is before cleaning it out. Now that its cleaned I would like to try it again, but I live in a small town and its a weekend.

 

Why do you have a red wire on your diagnostic port?

 

But like you said yours is full a stuff too but still throws codes. I've talked to many people who say the same, which leads me to believe that the plug is bad from god knows what and has nothing to do with the gunk in it. Can you just chop it off and splice another one on, or is not that simple? If the part's cheap, and is also a simple fix it would save some time to just replace it.

 

You have it all backwards, OBD1 pre 96 OBDII 96 and up.
The clip is a jumper for code check.
Look on inside of cap or cover on diagnostic port.
Use a paper clip and plug in to te1 and e1.

Turn on ignition key (don't start it) and check engine light should flash continually if there are no codes.
But I'm pretty sure you have 1 or more stored codes. Don't splice in another one, that would be a bone head move.

Use this link it will explain better.

http://www.troublecodes.net/Toyota/

 

Wait am I confused? Do you need a scanner to read it?

 

I think the mechanic I talked too doesn't know anything about it. He had some scanner and tried it but from that link it looks like you just connect the terminals and count the flashes. Am I understanding correctly?

 

No Scanner.

Go by the link and yes count flashes.