*Please help with my 98 4WD :(*

[Duhockey]

maybe I should finish reading before responding! sorry! :0)

 

[Pure 98]

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is that the light that is suppose to come on when you hit 4WD?
when i put it in 4L it comes on

 

[TheDurk]

I had the same 4L works and 4H does not syndrome on mine. Unfortunately, I was still in warranty so the dealer had to fix it and I only know they said it was electrical--loose connection coming out the tranny (but that was a bozo service writer, not a tech--he could have meant transfer case and probably did).

I don't have your setup--mine is 5sp manual--but I wanted you to know this can happen. I suggest you run the test on the VSV's I described to MDTrailrider in his thread. If that shows the vacuum changes VSV's in 4L and not 4H, then you know the problem IS electrical. I suspect this IS the case because the actuator/VSV setup works in 4L.

Then it is a matter of going to the wiring manual in ncttora and figuring out the engagement loop for the 4H system and focusing on what is different from the 4L loop. That should get you to a solution. Good luck.

I am also pretty sure the screw is not OEM. But we would need to know which hose to hazard a guess as to what is going on.

 

[Pure 98]

Thank The Durkim, I going to give it a shot this Sunday, hope i find the problem. I'll keep you posted

 

[96743runner]

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is that the light that is suppose to come on when you hit 4WD?
when i put it in 4L it comes on

Yes. That light comes on when you engage 4H or 4L.

 

[MDTrailrider]

Pure 98,

Have you gotten anywhere with diagnosing your problem?

I would check the magic button and the wiring harness at the shift lever first if I were you. If the problem is not there then I would check the electrical connectors at the ECU and then the electrical connectors at the position switches. If that doesn't solve it then I would start testing all the circuits and components per the FSM. I believe your problem is before the VSV's. I suspect that they are not receiving the signal to switch to 4H. You can test the VSV's in 2H, 4H and 4L like I did to help isolate the problem.

This is probably a dumb question but are you sure 4L works? Do you have a rear locker that is actually what is getting you through instead of 4L?

 

[MDTrailrider]

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is that the light that is suppose to come on when you hit 4WD?
when i put it in 4L it comes on

Then your A.D.D. and VSV's are working.

 

[Pure 98]

Then your A.D.D. and VSV's are working.

so it's the button then, right?

 

[MDTrailrider]

so it's the button then, right?

Probably but not necessarily. Look at my previous post. I strongly suspect that it is the button or something electrical between the button and the VSV's. I think a dirty button, wear at the lever or corrosion at another connector are the most likely sources. You may just have to jiggle something like I did to fix it.

 

[TheDurk]

My nominee as prime suspect would be the 4H position switch on the transfer case and its connector and wiring. It is the one part that is separate from the 4L circuit (aside from the command button itself.) But that's a guess.