4.0 Thermostat housing

falconian

New member
City
St. Louis
State
MO
#1
I just installed the Sniper EFI system on my 258. The problem is that I‘m using the temp port near the firewall for my temp gauge and don’t see another available port. i’ve looked everywhere. i need a 3/8” port for either the EFI or the temp gauge.

I’ve searched the forums and see reference to a 4.0 thermostat housing, but i can only find ones with an additional hose connection and not a threaded port. does anyone have a part number for a thermostat housing with a threaded port?

Thanks
Craig
 

CJ-8_Jim

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
NW Chicago Suburb
State
IL
#2
I thought all YJ 94-95 4.0 T-housing have a temp port that is used for the MPI. It's not 3/8, but maybe the YJ resistant/ohms matches yours. In that case you could get a corresponding pig tail and splice into it a yj

As I think about it, an easier option would be IF there is a brass reducer fitting you could find from the plumbing section of your favorite big box home improvement store.
 
Last edited:

Rosco1974

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
West Haven
State
UT
#3
What about this port (if your manifold has it)? IIRC this is the temp sensor port for the BBD/Emissions computer.

Screenshot_20200510-234742_Chrome.jpg
 

tower210

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
Olathe
State
KS
#4
I don’t remember which one I have...pretty sure it’s the stock 94 xj 4.0 housing

8C9B98EB-FFF4-492E-9816-FFAE1DF6E5D3.jpeg
 

CJ-8_Jim

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
NW Chicago Suburb
State
IL
#5
I don’t remember which one I have...pretty sure it’s the stock 94 xj 4.0 housing
Yes, That's it! That is what I was thinking.

Falconian - Rock Auto is a great tool -- very user friendly lookup and cross-reference.
That T-Housing with threaded sensor port (albeit larger than 3/8") was used across many years and many models:

1589214031696.png
 

ag4ever

Average Nut
LIFETIME
CJ-8.com Member
City
Richmond
State
TX
#9
Thanks. I’m in the process of identifying all the under hood wires and thining out any unused harnesses. I think I have that wire available, even though this Jeep had a janky manual choke cable that belonged on a lawn mower installed by a previous owner.
 

Sfisher

Basic User
CJ-8.com Member
City
El Dorado Hills
State
CA
#10
I don't have the parts numbers, but I wasn't able to use the port because it was too close to the bracket on for the serpentine belt IMG_1218.jpg
This pic is a little deceptive, the plug is right against the bracket to the right. Here was the alternative I chose: IMG_1219.jpg
 

tower210

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
Olathe
State
KS
#11
I don't have the parts numbers, but I wasn't able to use the port because it was too close to the bracket on for the serpentine belt View attachment 83259
This pic is a little deceptive, the plug is right against the bracket to the right. Here was the alternative I chose: View attachment 83260

Your power steering pump looks almost backwards from mine. What did it come from?
 

jmarkel

Scrambled for Life
City
Fairfax Station
State
VA
#15
I just recently reinstalled my Howell EFI on my engine rebuild. It has two temperature sensors on it. One sits at the back of the head right at the firewall. That goes to my temp gauge. The other is the two pronged one that provides temp readings to the computer. That one is threaded directly into the intake manifold. I don't see any difference where you put it, as long as it has good flow to it.
 
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