parkia86

I don't know why ads are showing up in my post I think it just associates the names of stuff with parts. It is not intentional. Anyway I am going to replace the cps tomorrow and if that doesn't work ill do a full tune up. But with the voltages being abnormal I think I might have found the culprit. The jeep still starts most of the time.

I just did an AC voltage test while trying to crank and the cps was giving off .223 VAC it looks like that might be the problem. How hard are they to replace?

To get started I have an 87 Jeep Comanche Laredo with the 4.0L engine and 4x4. The transmission is the 3 speed auto. This morning the Comanche started up fine but about 2 minutes into the drive she just stalled out. This has happened before and I just put it in park and she fired right up. About 6 hours later I was going to lunch and she would not start. The engine was cranking and she would sputter a bit as if she wanted to start but she wouldn't. After about 10 min I sprayed some starter fluid into the intake, she didn't start the first time but after several tries and putting starter fluid in the intake she fired up and I got her home. This is the second time she has done this and now I fear it's permanent, a few hours after getting home I tried again and she still failed. Work to date: I replaced the fuel injectors and the air throttle valve about 1.5 years ago. I do not remember the last time I did plugs and wires and distro cap. Replaced all of the engine bay vacuum lines. The battery is less than 2 weeks old. Fuel filter was replaced 3 yrs ago. Odd symptoms: I hear a strange buzzing/hissing coming from the vicinity of the fuel pump(assuming its the circular thing on the fuel tank). I put my hands on the vacuum lines in the area and could not detect a leak. I had the car in a garage this winter and prior to taking it out I have never heard that sound from the fuel tank. Spraying carb cleaner will eventually get her started but takes multiple attempts. If the engine is warm she will start. I plan on checking the fuel pressure at the rail this afternoon... Any other tests i should do to narrow down the problem? Also, if it is a fuel pump issue how do i tell the size of my fuel tank? All of the pumps are for either 16 or 20 gallon tanks... i want to make sure i order the right part.