1995 2.5 will not start

[TimTriumph]

So i suddenly had issues with hard starting, then choking, bucking and stalling.
So i get prepared to check my systems.

I started down my check list:
1.) O2 sensors (check)
2.) Throttle Positioning Sensor (check)
3.) Crankshaft Position Sensor tested with a meter for continuity (open - check)
4.) Fuel filter changed (though the previous one had only 3,000 miles on it)

Now the engine turns over but will not start.
So I start checking all fuses under the driver dash.

AND HERE IS WHERE THE NEW PROBLEM OCCURS.

While pulling out fuses and checking if they are good.... Somehow, one of the fuses is not making contact (all good fuses - perhaps corrosion in the box)

Now , when I turn the key in the first position, the "check engine" light does not come on. And also, I don't hear the fuel pump prime.
It was all working before because I just checked the "codes" and I got 1,2,3,3,5,5, (Normal so the jeep wasn't throwing any codes anyway)
But now when I turn the key to first position the "check engine" light doesn't come on.

I know that it has to be one of the fuses that is not making contact because it was working before i pulled the fuses out. (one at a time to check)

MY QUESTION - Do you know which actual fuse will correct this "check engine" light so the fuel pump will prime.
I want to use all of my resources to concentrate on the actual fuse that is creating this non connection instead of wasting my time on other fuses.
Because my next check is to see if I am getting gas to the fuel rail and this $#^%& fuse is stopping me for doing that.
Thank you in advance. see photos.
~Tim

 

[Chris]

So i suddenly had issues with hard starting, then choking, bucking and stalling.
So i get prepared to check my systems.

I started down my check list:
1.) O2 sensors (check)
2.) Throttle Positioning Sensor (check)
3.) Crankshaft Position Sensor tested with a meter for continuity (open - check)
4.) Fuel filter changed (though the previous one had only 3,000 miles on it)

Now the engine turns over but will not start.
So I start checking all fuses under the driver dash.

AND HERE IS WHERE THE NEW PROBLEM OCCURS.

While pulling out fuses and checking if they are good.... Somehow, one of the fuses is not making contact (all good fuses - perhaps corrosion in the box)

Now , when I turn the key in the first position, the "check engine" light does not come on. And also, I don't hear the fuel pump prime.
It was all working before because I just checked the "codes" and I got 1,2,3,3,5,5, (Normal so the jeep wasn't throwing any codes anyway)
But now when I turn the key to first position the "check engine" light doesn't come on.

I know that it has to be one of the fuses that is not making contact because it was working before i pulled the fuses out. (one at a time to check)

MY QUESTION - Do you know which actual fuse will correct this "check engine" light so the fuel pump will prime.
I want to use all of my resources to concentrate on the actual fuse that is creating this non connection instead of wasting my time on other fuses.
Because my next check is to see if I am getting gas to the fuel rail and this $#^%& fuse is stopping me for doing that.
Thank you in advance. see photos.
~Tim

View attachment 124147

View attachment 124148

It sounds like you’ve been methodical with your troubleshooting. Based on what you’ve shared, it sounds like you’re likely dealing with a fuse related to the engine management, specifically dealing with the fuel pump and computer systems.

For the 1995 YJ (2.5), the fuse that typically affects both the “check engine” light and the fuel pump operation is the “Engine Control Module” (ECM) fuse. You should find it in the fuse box under the dashboard. It’s usually a 10A fuse, but it could vary depending on your specific setup.

Given that you’re seeing no “check engine” light with the key in the ON position, it’s definitely worth checking the ECM fuse for signs of corrosion or damage. If you find any issues, replace the fuse and make sure the connections are clean. If the fuse is good but still not making contact, you might want to consider cleaning the fuse box terminals as corrosion can impact those connections.

Additionally, make sure to check any ground connections related to the fuel system; poor grounds can sometimes lead to similar symptoms.

Once you've addressed the fuse issue, try turning the key again to see if the “check engine” light comes on and if the fuel pump primes. Best of luck, and keep us updated on what you find!

 

[Goesman]

It sounds like your in the same boat as me. Hopefully we can figure it out.

 

[T-Rex Jeepster]

I'd pull the fuel pump and check connections and pick up filter......Here's how to do it the easy way.......Done it to mine....