Sorry for the long post, but I am trying to give as much background as possible.
I inherited a 1997 Wrangler with a 2.5L. It has 198,XXX miles on it but the engine and the majority of the engine sensors were replaced at 196,XXX. It was running fine up until it was parked about 2 years ago. I didn't do anything with it because I did not have the title at the time and had too much other things going on in my life. A few weeks back, I decided it was time to get it back on the road. I finally had the title, so I renewed the registration and bought a new battery for it. It started up with hardly any issue when I decided to clean it up and then move it into my shop to start going through everything.
After I got it in the shop and cleaned out some of the rats nests from sitting, I could not get it to start again. The engine would just crank and crank like it was getting no spark. I found multiple spots in the wiring where rats and mice had chewed on the insulation and a vacuum line that had been chewed through. I repaired all of it and still no change. I realized the ASD was not getting the ground signal from the PCM to close, so I tested both the cam and crank position sensors, the MAP sensor, and the TPS sensor. They all checked out good. I then tested the +5VDC supply from the PCM and noticed i was only getting about 1.6VDC with all of the 5 volt sensors unplugged. After everything I had tested, the posts I read on this forum and the videos I had watched on youtube, I decided the PCM had to be bad. Most of my adult professional experience has been in electronics as an electronic technician or an automation technician in oil and gas. As such, I figured I'd crack the PCM open to see what was going on inside. Sure enough, two of the capacitors has leaked onto the PCB and the resulting corrosion had caused the small transformer to separate from the board as well.
I ordered a new PCM through Flagship One and installed it. The Jeep will start almost as soon as you turn it over every time. However, it will only run for a couple seconds. My initial thought was SKIM, but FS1 assures me they disabled that in the PCM before shipping it to me. I have had my steering column completely apart and there is NO SKIM module present. The only reason I am inclined to believe FS1 did disable the SKIM is because if you pour gas or spray starting fluid directly into the TB, it will stay running as long as you keep giving it fuel. Doesn't the SKIM kill spark and fuel?
My next thought was that it has to be the fuel supply (pump/sending unit/filter/injectors). I have a fuel pressure tester, but I have been unable to use it because my fuel rail does not have a Schrader valve or a PRV of any sort that I can connect it to and I have yet to acquire an adapter that'll fit my fuel line. I did, however, pull the rail and all the injectors and tried turning the Jeep over with them out, but still connected to the wiring and the fuel rail. The fuel pump is producing enough pressure to open the injectors and they spray as they should. Also, the ASD relay is staying engaged the entire time.
I am at a loss on what to do next. Any help would be greatly appreciated!
I inherited a 1997 Wrangler with a 2.5L. It has 198,XXX miles on it but the engine and the majority of the engine sensors were replaced at 196,XXX. It was running fine up until it was parked about 2 years ago. I didn't do anything with it because I did not have the title at the time and had too much other things going on in my life. A few weeks back, I decided it was time to get it back on the road. I finally had the title, so I renewed the registration and bought a new battery for it. It started up with hardly any issue when I decided to clean it up and then move it into my shop to start going through everything.
After I got it in the shop and cleaned out some of the rats nests from sitting, I could not get it to start again. The engine would just crank and crank like it was getting no spark. I found multiple spots in the wiring where rats and mice had chewed on the insulation and a vacuum line that had been chewed through. I repaired all of it and still no change. I realized the ASD was not getting the ground signal from the PCM to close, so I tested both the cam and crank position sensors, the MAP sensor, and the TPS sensor. They all checked out good. I then tested the +5VDC supply from the PCM and noticed i was only getting about 1.6VDC with all of the 5 volt sensors unplugged. After everything I had tested, the posts I read on this forum and the videos I had watched on youtube, I decided the PCM had to be bad. Most of my adult professional experience has been in electronics as an electronic technician or an automation technician in oil and gas. As such, I figured I'd crack the PCM open to see what was going on inside. Sure enough, two of the capacitors has leaked onto the PCB and the resulting corrosion had caused the small transformer to separate from the board as well.
I ordered a new PCM through Flagship One and installed it. The Jeep will start almost as soon as you turn it over every time. However, it will only run for a couple seconds. My initial thought was SKIM, but FS1 assures me they disabled that in the PCM before shipping it to me. I have had my steering column completely apart and there is NO SKIM module present. The only reason I am inclined to believe FS1 did disable the SKIM is because if you pour gas or spray starting fluid directly into the TB, it will stay running as long as you keep giving it fuel. Doesn't the SKIM kill spark and fuel?
My next thought was that it has to be the fuel supply (pump/sending unit/filter/injectors). I have a fuel pressure tester, but I have been unable to use it because my fuel rail does not have a Schrader valve or a PRV of any sort that I can connect it to and I have yet to acquire an adapter that'll fit my fuel line. I did, however, pull the rail and all the injectors and tried turning the Jeep over with them out, but still connected to the wiring and the fuel rail. The fuel pump is producing enough pressure to open the injectors and they spray as they should. Also, the ASD relay is staying engaged the entire time.
I am at a loss on what to do next. Any help would be greatly appreciated!
