Does a jeep 4.0 valves self adjusting or do you adjust them .when you start it up it sounds like a race car .

lash adjusters are self adjusting from the engine oil pressure
a normal setting of the valve clearance of .010"inlet and .012" exhaust will give the adjusters enough room to adjust
you can put them in oil and pump the adjuster to remove any air but that will happen on oil pressure being attained

The lifters are not supposed to be adjusted.
Each lifter is a small "engine" itself.
They are supposed to be self-adjusting (this was changed way back in the 1950's).
If you are determined to adjust them, you will need to contact a place that builds race car engines, because there are procedures race cars use that adjust them.
Oh yes, you can also replace hydraulic lifters with solid lifters.
Some race cars do, and that is because, at really high RPM's, lifters can :"float", causing the engine to "top out" and not go any faster. I had that happen on a car back in the 1970's.
Be blessed.

They are NOT hydraulics. That started in 1990. They were adjustable in 88 and 89.

Yes they are.

all saturn s series and l-series cars have hydralic valve that do not need adjustments or even have anyway to adjust if you have a tick sound from a sl1 pull the valve cover off and check the rocker arm shaft bolts they back out the cover gasket can be reused if its not torn or falling off

On Vehicle Inspection If a clanging noise due to the lash adjuster produced immediately after the engine has started or during operation persists, perform the following checks:

1. Check the engine oil, and add or replace if necessary.
   1. If the engine oil is low, the air drawn in from the oil strainer will be trapped in the oil passage.
   2. If the engine oil level is higher than the specified level, agitation of oil by the crankshaft could cause a large amount of air to enter the oil.
   3. A deteriorated oil contains a large amount of air, because the air, once trapped, is not readily separated from the oil. If the air trapped due to these causes enters the high pressure chamber in the lash adjuster, the air in the high pressure chamber will be compressed while the valve is in the opened position. The lash adjuster will be drawn too far in, and will produce noise when the valve closes. This is the same phenomenon that occurs when the valve clearance is adjusted to an excessive dimension. Fig. 1: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 2.0L, 2.3L, 2.4L and 2.6L Engines
      Fig. 2: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 3.0L (12 Valve) Engines
      Fig. 3: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 3.0L (24 Valve) Engines
      Fig. 4: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 3.5L Engines
      Fig. 5: Push the rocker arm to check if the rocker moves down or not — all engines except for the 3.5L Engines.
      Fig. 6: Push the rocker arm to check if the rocker moves down or not — 3.5L Engines.
      In this case, the normal condition will be restored if the air escapes from the lash adjuster.
      
2. Start the engine and slowly race (accelerate the engine from idling speed to 3,000 rpm in 30 seconds and then decelerate it to the idling speed in 30 seconds) it several times (less than 10 times). If racing the engine causes the noise to die away, it means that the air has escaped from the high pressure chamber of the lash adjuster and that the lash adjuster has regained its normal functions.
   1. When the vehicle is parked on a slope for a long period of time, the oil in the lash adjuster will decrease. When the engine is started, the air might enter the high pressure chamber.
   2. After a long period of parking during which the oil in the oil passage goes away, it will take some time before the oil is re-supplied to the lash adjuster. Therefore, the air could enter the high pressure chamber.
3. If any abnormal noise is not eliminated by racing, check the lash adjuster.
   1. Stop the engine.
   2. Set the engine so that cylinder No. 1 is positioned at the top dead center of the compression stroke.
   3. Press the rocker arm at the area indicated by the white arrow mark to check whether the rocker arm is lowered or not.
   4. Slowly turn the crankshaft 360°clockwise.
   5. In the same procedure as step "c'', check the rocker arm at the area indicated by the black arrow mark.
   6. Push down the rocker arm at a portion located right above the lash adjuster. If the rocker arm goes down readily, the lash adjuster is defective. Replace it with a new one in accordance with Step 4. In addition, when replacing the lash adjuster, be sure to remove air positively from the lash adjuster before installation. Then perform inspection in accordance with steps "a'' through "e'' to make sure that there is no abnormality. In addition, if the rocker arm is felt to be very stiff or cannot be pushed down when it is pushed, the lash adjuster is in the normal condition. Therefore, check for other causes of noise.

Bleeding and Checking When cleaning or checking the lash adjusters, use only clean diesel fuel. To test the lash adjusters, follow this procedure.

1. Immerse the lash adjuster in clean diesel fuel.
2. While lightly pushing down the inner steel ball using a small wire, move the plunger up and down four or five times to bleed air. The use of the retainer facilitates the air bleeding of the rocker arm mounted type lash adjuster.
3. Remove the small wire and press the plunger in. If the plunger is hard to be pushed in, the lash adjuster is normal. If the plunger can be pushed in all the way readily, bleed the lash adjuster again and test again. If the plunger is still loose, replace the lash adjuster. NOTE: Upon completion of bleeding the air out of the lash adjuster, hold the adjuster upright to avoid the diesel fuel from spilling.
   
4. After air bleeding, set the lash adjuster on the special tool (leak down tester MD998440).
5. After the plunger has gone down somewhat 0.008–0.020 in. (0.2–0.5mm), measure the time needed for it to go down an additional 0.04 in. (1mm). Replace if the measured time is not between 4–20 seconds.

do you have a T.P.S if so take it off and clean it with brake cleaner, still races buy new TPS

Idle at 40 is fine. Do what I said and give it a chance to work...chances that an adjusting nut has loosened up is ) if it's a 4.0 (you didn't say) these have non adjustable valves. Any engine with adjustable valves uses "interference thread" nuts that do not back off.

The proportioning valve most definately can be the problem. Did you change it or is it the original? (A disc/drum system uses a 70%front/30%rear braking ratio, whereas an all-disc system is alot more even). I would first bleed the master cylinder. Then I would 'gravity bleed' the rest of the system by opening the bleeders on all 4 wheels. Do not at any point let the m/cylinder go dry. Also, do not touch the brake pedal.
Continuously check all 4 bleeders, when clean brake fluid with no bubbles at all is running from a bleeder, close it. When all 4 wheels are done, recheck the fluid level and you should be OK.
Pump the pedal to 'self-adjust' the rear calipers, then re-check the fluid level.
Any problem after that means you either have a loose connection (it's possible for a tiny leak to let air in, but not let fluid leak), a leak, or you need a new (disc/disc type) proportioning valve. I would try Summit Racing myself. Good Luck!

this is the way i adjust tappets remove all spark plugs


153
-----------
624
draw this on a paper

u start with no1 get the valves rocking which means turn engine over by hand til no 1 rockers one rocker is going up and the is going down u may have to turn the engine back and forth slowly
to see it . once u have no 1 rocking u can adjust no 6 valves adjust them with a little clearance so the push rod still spins freely

next look at chart
1 rocking adjust 6
5 rocking adjust 2
3 rocking adjust 4
6 rocking adjust 1
2 rocking adjust 5
4 rocking adjust 3

once u have made these adjustments recheck firing order 153624
try and restart engine if it starts the turn all rocker ajuster a further 1/4 of a turn and your done u may have too wait a bit of time for the liffters to bleed down after u do final adjustment if it dont start

hope it helps please leave rating and if u need more help let me know