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Heavy10mm

New member
Ok. So the trans is ok on my 89 4.2L, but I’m concerned about a real road test due to the fact I can’t read water temp. I pulled the gauges and followed the cable/hose at the back of the water temp gauge to this...
b329d571e2b4f122fd959e98f0202ad4-1.jpg

I’m no car guru, but this doesn’t seem right... what is this, and where should I look for the proper water temp sender? My manual isn’t helping much.

Thanks again!


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If you could buy a factory service manual.. Pricy but worth it. Idk if they have manuals that far back, buts it's worth looking.


Regards,
JPNinPA

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Last edited:
I believe you have two. One for the gage and one for the PCM. The PCM one is below the thermostat housing. That is where the top radiator hose connects to the engine.


Regards,
JPNinPA

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JPNinPA said:
I believe you have two. One for the gage and one for the PCM. The PCM one is below the thermostat housing. That is where the top radiator hose connects to the engine.


Regards,
JPNinPA

Sent using TapTalk
Click to expand...

So is the one in the picture the one that should be going to the gauge?


“Nuts...”
Gen. Anthony McAuliffe
 

I believe so either there or in the back of the engine.
The one at the thermo housing goes to the PCM


Regards,
JPNinPA

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JPNinPA said:
I believe so either there or in the back of the engine.
The one at the thermo housing goes to the PCM


Regards,
JPNinPA

Sent using TapTalk
Click to expand...

Sweet. Thank you! That means it’s hooked up the way it’s supposed to be, but is malfunctioning in some other way. It sure is easier to get around under the hood here than it is on my wife’s ‘13 Hyundai lol


“Nuts...”
Gen. Anthony McAuliffe
 

Nice find!


Regards,
JPNinPA

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TerryMason said:
I'd make a lowball offer on this and see if they'll take it
Click to expand...

Thanks a bunch! I’ll see if they’ll take what I can offer when money is a bit more abundant. It is a sweet find!

I’ve decided that I don’t think she overheats. There’s a bit of light smoke when I start her, but it dies down when she heats up. And she doesn’t leak antifreeze (that I can see). So apart from the oil leak that I’m pretty sure is, as JPNinPA suggested, the rear main seal, I need to figure out the temp gauge and try to figure out why she’s hard to start and why she stalls. I’ve got more time than money, so it’ll be a process I guess lol.

You guys are awesome. Thank you so much!



“Nuts...”
Gen. Anthony McAuliffe
 
Last edited by a moderator:

JPNinPA said:
Describe the starting issue and the stalling issue.




JPNinPA
Using Jeepz.com app
Click to expand...
It cranks and cranks, catches and loses it a couple of times... I have to crank for a couple of minutes before it starts cold.

It stalls when coming to a stop if I don’t keep my foot on the gas, so to drive it around town I have to put it in neutral and rev up a little to keep her from stalling out



“Nuts...”
Gen. Anthony McAuliffe
 
Ok for the starting issue. Try without starting the engine to turn the key to on and wait 5 sec. Then off for 1 one on for 5 sec then start. Not sure how far back it goes but in YJ and TJ the fuel check valve goes bad. When this happens the fuel drains back yo the tank. Until it's primed your engine will not start.

You have a carb correct? Check for vac leaks.


Regards,
JPNinPA

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Last edited:
JPNinPA said:
Ok for the starting issue. Try without starting the engine to turn the key to on and wait 5 sec. Then off for 1 one on for 5 sec then start.

You have a carb correct? Check for vac leaks.


Regards,
JPNinPA

Sent using TapTalk
Click to expand...

Wow! You’re a wizard! I had to go through the 5-1-5 process 2 or 3 times, but it fired right up, relatively speaking. Nice!
JPNinPA said:
You have a carb correct? Check for vac leaks.

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Click to expand...

I can aid the search for a vacuum leak by spraying starter fluid, right?

Thanks yet again


“Nuts...”
Gen. Anthony McAuliffe
 
Heavy10mm said:
Wow! You’re a wizard! I had to go through the 5-1-5 process 2 or 3 times, but it fired right up, relatively speaking. Nice!


I can aid the search for a vacuum leak by spraying starter fluid, right?

Thanks yet again


“Nuts...”
Gen. Anthony McAuliffe
Click to expand...

Not a wizard. Just common issues and key word triggers make the connection.
Yes, Starter fluid, carb cleaner, WD40 water...


So now you know your starting issue is lack of fuel. You might check the fuel pressure and leak down. Maybe change the filter.

Regards,
JPNinPA

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Last edited:
Heavy10mm said:
Oh! I managed to find a PDF of the shop manual. It’s full of great and very specific info. I think it’s about 1200 pages long. And it’s got great pictures, too
8e8a719098fac0d2e9b8f9a5996eefb0-1.jpg



“Nuts...”
Gen. Anthony McAuliffe
Click to expand...

Your going to enjoy that... Only last advice now is only use OEM sensors. Aftermarket are bad right out of the box many times.


Regards,
JPNinPA

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JPNinPA said:
Your going to enjoy that... Only last advice now is only use OEM sensors. Aftermarket are bad right out of the box many times.


Regards,
JPNinPA

Sent using TapTalk
Click to expand...

Thanks for that advice.
Can I just buy a 50’ spoil of vacuum hose, or will each piece be application-specific?



“Nuts...”
Gen. Anthony McAuliffe
 
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