Alright, I recently picked up a 98 XJ with a broken piston on the 4.0 at just over 200k. I rebuilt the motor and now it's not trying to start. Check cam timing, dizzy timing, all plugs, 100% spot on. The motor isn't even trying to start at this point, no sputter, cough, pop back, or anything else. Throw a timing light on it, no spark. Okay. Brand new cps. Cleaned out the connector and checked the cps with an ohm meter. Now have spark. Try again, and still no start, no cough, no bobble, nothing. Alright, cleaned all the grounds, nothing. Next fuel pressure. Pump was just replaced and line pressure is ~50psi at the rail. Injectors are not firing. Check voltage at the injector. Nothing. Grab a handful of asd's and another pcm from a wrecked 98 xj at the jy, tried all of them, and tried the different pcm. Nothing. Checked G101,102,103: cleaned. Nothing. Went through the faq and several threads and there's nothing I can find to even make this motor sputter on the starter. I'm at wit's end with this one, I'll be honest.
Tl;Dr: feel like I've tried nearly everything. No start secondary to no injector firing.
Bullet points for you actionable information types:
Things I have replaced:
-Engine, new rebuild, verified engine timing and correct dizzy orientation
-CPS, new
-Fuel pump, new
-ASD, attempted multiple other ASD's
-Attempted second JY pcm that appeared to be running when that 98 xj met its demise
-new cap, wires, rotor, oem plugs, all verified to have correct timing
-new battery
-new coil
Things I have cleaned and verified:
-injector plugs
-cps plug
-o2 sensor plug
-g101, 102, 103
-no blown fuses, no corroded fuse contacts
-50psi rail pressure
-read naxja faq + relevant threads via search
Problems I'm still having:
-No start, cough, sputter, or pop back
-no b+ at injectors
-no injector firing
-out of relevant naxja threads.
Vehicle was supposedly running without issue when it cracked a piston skirt.
Tl;Dr: feel like I've tried nearly everything. No start secondary to no injector firing.
Bullet points for you actionable information types:
Things I have replaced:
-Engine, new rebuild, verified engine timing and correct dizzy orientation
-CPS, new
-Fuel pump, new
-ASD, attempted multiple other ASD's
-Attempted second JY pcm that appeared to be running when that 98 xj met its demise
-new cap, wires, rotor, oem plugs, all verified to have correct timing
-new battery
-new coil
Things I have cleaned and verified:
-injector plugs
-cps plug
-o2 sensor plug
-g101, 102, 103
-no blown fuses, no corroded fuse contacts
-50psi rail pressure
-read naxja faq + relevant threads via search
Problems I'm still having:
-No start, cough, sputter, or pop back
-no b+ at injectors
-no injector firing
-out of relevant naxja threads.
Vehicle was supposedly running without issue when it cracked a piston skirt.