831xj

96 4.0 auto

Just swapped a 91 block and head over to this 96 and swapped the appropriate sensors for obd2 engine harness as well. Been driving fine for 2 weeks. Was driving and came to a stop light. When I went to take off I had a crazy rough running jeep and couldnt get past idle speeds
Will start up and idle rough as hell, eventually the idle smooths out and is around the 750 rpm mark. ANY touch of the gas it with sputter and run like absolute crap.

I do have a scanner with live data

TPS voltage - 5.17 FEED 3.98 at WOT and .8 at closed.. smooth transition throughout
49 psi at idle fuel pressure and when attempting to gas
MAP "hg" 4.5 at idle
Swapped map with a known working one from another jeep
Swapped TPS from another jeep
changed the coil
changed IAC
changed plug wires and inspected spark plugs
changed cap
removed distributor and verified timing
changed fuel injectors
Tried unplugging o2, coolant temp sensor

Can't really think of anything else

Need to get this rig back rolling ASAP

CCKen

Did you keep the '96 distributor?

97grand4.0

Shooting from the hip, sounds like my cam sensor when it started to go.

831xj

I did keep it, accidentally broke the fork tab off it tho when fumbling stuff around in the garage

skife

Did the distributor move at all?

831xj

The distributor and timing have been set again. Same issue is still going.

#1 tdc on compression stroke rotor was just at the tail end of #1 spark plug on diz cap

831xj

I do notice the timing advance a lot on my scanner .. from 10* to 29ish tops

CCKen

I think I would replace that distributor.

831xj

It's in the garbage can... was never installed.

BlueRidgeMark

Okay.... so what distributor is in there?

831xj

It's fixed. Trans bolt was forgotten to be torqued and had backed out causing a gap. Damaged the CPS. New bolt and CPS and it runs great. Flexplate was fine... was worried about that.