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Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
I'm not understanding these points as TTBOMK Cherokee 4.0 PCM does not have the ability to do "cylinder deactivation"-- where did you get that info?
That said, if you need to get an o-scope (I use Hantek above, if you get that far IIWY I'd look at the entry level Pico) while the box is 130-200 bucks you're probably going to need 1 or 2 additional probes so you may get to 400 bucks in a hurry.
With your scanner can you generate waveforms for the O2 sensors? Do you have 2 or 4?
I would also look for intake gasket leak, the exhaust system where a crack could affect O2 sensor readings (see bj2001's saga, didn't turn out to be that but interesting read), consider leaky injector, leaky lifter, broken valve spring, maladjusted valve(s)(yes they do need to be adjusted, or at least checked if you have an unsolvable problem)(prob find it under "preload") and worn cam lobe(s).
about the cylinder deactivation.. during warm up when #1 is missing of i start driving goes to flashing cel and getting codes for #1 and #6 when that happens number 1 and six injectors are not firing (confirmed with noid light and test light) they both missing the ground pulse that pcm uses to fire them.. now during that if I shut off the car and start it this goes away.. keep in mind #1 is still missing but its not a flashing cel and no pulse on 1+6 injectors that's why I'm assuming that pcm detect the miss on 1 and cuts off 1 and six because there together to keep the engine kinda balanced, I may be wrong why it does it but I'm pretty sure that it does it. Fuel trims are +6/8 % all thr time, smoke test it and its leaking a bit from intake hoses that go to purge valve but I'm thinking that this couldn't effect just one cylinder.. also spray water around intake ans specifically around #1 intake port and nothing..pull thr cover twice valve springs and gap between rocker and push rod is good ,cam should be fine that was gonna be a come and go misfire.. the only thing I can't check is lifter because I have thr head with the narrow holes on top so i can't pull thr lifter without pulling the head.. so I'm trying to eliminate all electrical before I pull thr head just to check the lifter..
So again, pardon me if I am misunderstanding but there's not supposed to be clearance. It's go to -0- backlash then crank it another 3/4 turn.
The renown ccKen image:
I removed the rocker inspected the springs and put thrm back torque by hand really good so I may missing something there.. could you share more detailed info about how to adjust it? And by clearance i mean that there was no movement on the rocker ( i was trying to figure if its have a collapsed lifter..)
Well, if injector sync is done by the cam sensor, and although you sync'ed it once, IIWM I'd go back and look there. These are the settings I used for CPS/CKS:
I removed the rocker inspected the springs and put thrm back torque by hand really good so I may missing something there.. could you share more detailed info about how to adjust it?
The rest of ccKen's procedure:
You will be checking preload as you torque down the cap screws.
Crane has two procedures. The one I prefer is the cap screw turn method (1/2 to 1 turn).
The desired preload is between .020" and .060"
See pic.
You'll install the bridge, pivots, rockers, and cap screws over the push rods. Slowly turn each push rod while slowly turning down the cap screws until resistance is felt in the push rod turning.
Mark the cap screw with index marks as shown in the pic. Alternate tightening the cap screws until they bottom out, then torque them to 21 ft/lbs. Observe the index mark position. This will show you the preload on the lifters.
You will be checking preload as you torque down the cap screws.
Crane has two procedures. The one I prefer is the cap screw turn method (1/2 to 1 turn).
The desired preload is between .020" and .060"
See pic.
You'll install the bridge, pivots, rockers, and cap screws over the push rods. Slowly turn each push rod while slowly turning down the cap screws until resistance is felt in the push rod turning.
Mark the cap screw with index marks as shown in the pic. Alternate tightening the cap screws until they bottom out, then torque them to 21 ft/lbs. Observe the index mark position. This will show you the preload on the lifters.
