I managed to find some time over the last couple days to work on my Jeep. I had made up a list of items to check out.
This is a copy of the list that I followed last night and the night before. The first part is for the PCM only.
PCM WIRE FUNCTION RESULTS
Pin loc. Color
3 red battery good
4 blk/lt blu sens ground good
5 blk/wh sig gnd good
6 voi/wht sens 5v supply good
7 orange sens 8v supply good
9 dk. Blu ign start/run good
10 dk blu/wht power steering sens N/A (4cyl only)
11 blk/tan ground good
22 org/dk. Blu TPS good
24 gry/blk CKS good
29 wht/pnk brake sw in good
30 brn/yel neutral sense good
43 gry/lt.blu tach signal not checked yet
44 tan/yel CPS good
All other pins and wires have either not been checked or added to the list. I am focusing on the primary system until all checks are complete.
Part two of my list. These are the other systems that I had checked on.
Compression check. All cylinders were in the range of 85-110 PSI (according to the manual, they should be within 75%). They went up to 95-115 PSI when I squirted oil into the cylinders. All cylinders came up on pressure rapidly, so I assume that they are in an acceptable condition.
Power coming from Bulk Head Connector to the PCM and the PDC. Power checked out good on IGN RUN and START.
Power going into the PDC. It checked out good on RUN and START.
Neutral Safety Switch. Checked for normal operation. Checked good.
Distributor rotation. It checked good.
Spark at all plugs by using a test plug. All spark plug wires checked good.
Firing order, rotated all terminals on the distributor cap, then cranked the engine. The only changes noticed were backfiring either through the intake or the exhaust, otherwise, no change.
Checked OHM readings on all fuel injectors. All checked at 14.4-14.7 (avg. 14.6 ohms). They all checked outgood.
Checked for power to Fuel Injector terminals. They checked good.
After all this checking, I was still baffled. So I came up with an idea. I installed my starter jumper switch and set it aside. My timing light decided to fail on me, so I once again unplugged the #1 spark plug wire and installed a test plug. I then disconnected the #1 fuel injector wire plug and installed a test light. I then turned on the key, held the starter button and watched for spark and light, I also observed the pattern between the two. I observed the spark to be about 180 degrees off of the injector pulse. To me this sounds correct since I understand how a 4 cycle engine works.
So the bottom line is this. I am getting SPARK and FUEL INJECTOR pulse. I have fuel going to the fuel rail. I may have to perform another FUEL PRESSURE and FLOW test. But this is what further baffles me is that I can dump some gas down the throttle body and STILL get no fire.
So if anyone has an idea to throw at me, please do so. I feel that Iam soooo close to getting this thing to run.