Just thinking out loud here...so if anything strikes a chord with you....try it.
You say you're getting fuel and spark. I would assume you're getting air, too.
I have to assume you are getting a hot enough and consistent spark. also.
You also think the timing is Ok.
That leaves one main thing to check:
It's flooding. ( duh...).. I'm wondering if it's getting too much fuel while trying to start ? If so....why? Injectors all stuck open? Doubtful. But depending upon what the TPS is telling the PCM, maybe it's possible. So I'd pull the TPS out and reinsert it...just in case.
I'd also hook a code checker up to it and see if it ran long enough to tell you anything.
On 7th PCM. Finally got a good one.
Alright after many phone calls and hours staring into my computer screen, a few possibilities have surfaced.
Reset/discharge PCM and other circuits (Haha please correct me if I'm wrong - or the tech was wrong who told me this). Disconnect the (-) batt cable and using a screw driver connect (-) batt cable to the positive terminal for 10+ seconds---- I figured leaving the jeep unplugged for so long would be enough to reset anything. REASONING: The idea behind the is that the PCM is so out of wack from the Old motor and the hard life she had; resetting this would allow her to learn with a "fresh" mind. But is it possible that the PCM is actually "dumber" now?
Went over the vaccums, electricals, etc. All was good.
*Still need to Volt test my sensors, and Have the fuel pressure checked with a gauge. Also will move the Crank Shaft Postion Sensor around - touchy clearences.
The days attempted start: So, dry plugs, dry cylinders, everything checked okay. Putting the pedal to the floor for this start up (since the plugs were soaked in fuel when i took em out, as well the stench of raw fuel from the tail pipe; Maybe to rich/much fuel.) This basically kills the fuel delievery (anti flood??).
Turned the key, everything engaged (fuel pump etc), then pedal to the floor and holding it there I cranked it over. Couple sputters, and a stutter, and.... I let go the pedal, it goes to just cranking over BUT very weakly, as the battery finally decided it wants to be charged.
Yup basically says very little, about the problem or the progress.
Try finding the yellow/purple wire in the drives side kick panel, and ground it. Maybe u do have the anti theft, just don't know it. I know my anti theft kicks in after a dead battery, and I have to deactivate it, or it won't start. Much like ur symptoms....
"Not a single **** shall be given."
Battery charged so I decided to give it one little shot, Pedal to the floor cranked it for 6-7 seconds to make sure it was "fresh" and not flooded. She sputtered for a second, than just cranked. So I figured I'd feather the gas, Got a few stutters and than gave a little more. Stopped there as it was just a small test.
Fuel pressure was somewhere near 35ish +/- . So overall fuel system is good?.
Going to try to reposition the the distrib. as well rechecking timing, put on (old) but "known" working coil.
No luck finding the anti theft. Again I'm a 1995 Zj Laredo; didn't think I had anti theft other than a kill switch. Oh and a key fab strictly for the doors.
Why are you even touching the gas pedal while trying to start it? Because it's been flooded and you're giving it air ? It's not a 2 stroke...chuckle... ( although I wish they were !)
As for resetting the PCM, if it's like my 97, just disconnect the negative bat cable and turn the ignition key to the ON position for 3-5 seconds. Then wait a minute or two, reconnect bat cable and hit the starter.
I'd double check that spark too.
On 7th PCM. Finally got a good one.
Mashing the pedal and holding it on start up actually kills the fuel flow completely AFTER an intial fuel injection. Thios fuel kill could help air out your fuel soaked plugs/excess fuel. Also may allow for the spark to at least have a chance to ignite instead of being completely soaked. Also we suspected flooding of the cylinders as there IS fuel and Spark but no Pops or sputters = too much fuel, or There is no spark even though we are positive there is one. SO stop the flooding and the spark plugs get a chance. and this worked. got some pops sputters and stutters. ONLY while holding the Pedal down (3-4secs), than feathering it. BUT who know when your this desperate anything can seem like its having an "effect".
And after another day of no luck, i'm replacing some parts as well. Also going to start a complete written list, with a process of elimination. Yea I know, this is the first thing i should have done. And it was, but now it'll be written down.
If you have a kill switch, you may have an after market alarm. I've never heard of one coming from the factory with a kill switch. This could be your problem. Check the wiring to the kill switch. See where those wires go. Possibly there's a relay involved that has gone bad. If that's not the problem, check and or replace you spark plug wires. Most wires are made like crap. All you have to do is pull on them a little too hard and they're shot.
[_]☺☺[_] 96' Grand Cherokee Laredo 265,000 miles and still going strong.