Will run.for about 30/40 mints.all the gages go off.run a code check all good win running.win it shuts down.then we get on erra.on it.added all new cam sincer/crank/coil pack/battery/new ground wires/i toke the dash apart.clean all the connetors/what am i doing to fix it.I NEED HELP PLZ.befor it drives me crazer.

SOURCE: I have a 93 Jeep Wrangler 4.0 that cranks and

Ok...you mentioned that there is no spark coming from the coil when it's in no start...Is there power from the alternator going to the coil?
One other item...If the timing chain is worn and stretched, it is possible that the cam sensor and crank sensor are out of phase with each other, just enough where a temperature difference will change starting ability.
One question...while in no start, have you tried changing the throttle position while cranking to see if it lights at part or 3/4 throttle?

Duane Wong

• 6826 Answers
• Posted on Jul 30, 2010

SOURCE: my 2001 jeep grand Cherokee will not start don?t

Timing Chain, Sprockets, Front Cover and Seal REMOVAL & INSTALLATION 2.5L and 4.0L Engines

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   • Negative battery cable
   • Accessory drive belt
   • Cooling fan and shroud
   • Crankshaft damper
   • Front crankshaft seal
   • Accessory brackets
   • Front cover
   • Oil slinger
3. Rotate the crankshaft so that the timing marks are aligned. Fig. 1: Timing chain alignment marks — 2.5L and 4.0L engines
   
   
4. Remove the timing chain and sprockets. To install:
   
5. For 2.5L engines, turn the timing chain tensioner lever to the unlock (down) position. Pull the tensioner block toward the tensioner lever to compress the spring. Hold the block and turn the tensioner lever to the lock (up) position. Fig. 2: Timing chain tensioner — 2.5L engines
   
   
6. Install the timing chain and sprockets with the timing marks aligned. Tighten the camshaft sprocket bolt to 80 ft. lbs. (108 Nm) for 2.5L engines or to 50 ft. lbs. (68 Nm) for 4.0L engines.
7. For 2.5L engines, release the timing chain tensioner.
8. Install or connect the following:
   • Oil slinger
   • New front crankshaft seal to the front cover
   • Front cover, using a new gasket
   • Timing Case Cover Alignment and Seal Installation Tool 6139 in the crankshaft opening to center the front cover Fig. 3: Timing Case Cover Alignment and Seal Installation Tool 6139 — 2.5L and 4.0L engines
     
   
   
9. Tighten the front cover bolts as follows:
   1. Step 1: Cover-to-block 1⁄4 inch bolts to 60 inch lbs. (7 Nm)
   2. Step 2: Cover-to-block 5⁄16 inch bolts to 16 ft. lbs. (22 Nm)
   3. Step 3: Oil pan-to-cover 1⁄4 inch bolts to 85 inch lbs. (9.5 Nm)
   4. Step 4: Oil pan-to-cover 5⁄16 inch bolts to 11 ft. lbs. (15 Nm)
10. Install or connect the following:
    • Accessory brackets
    • Crankshaft damper. Tighten the bolt to 80 ft. lbs. (108 Nm).
    • Cooling fan and shroud
    • Accessory drive belt
    • Negative battery cable
11. Start the engine and check for leaks.

Wade Mobley

• 513 Answers
• Posted on Dec 03, 2010

SOURCE: i have a 2000 jeep

it does sound like the ecu is bad the only other thing it could be is the antitheft system is having problems

SOURCE: I have a 94 jeep

check the ADS relay in the power center under the hood, swap out that relay for another on to see if it'll start-did you check to see if you have a signal at the crank sensor harness (should be about 5-7 volts)?