Question about Jeep 1999 Grand Cherokee Laredo

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Changed engine in 99 jeep grand cherokee larado 4.0 engine now no spark

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2 Answers

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  • Jeep Master
  • 20,706 Answers

Wow first guesser asks you to replace most expensive EFI part in car,
dang man. check fuses first.
what nice advice. that is. (not)
sorry no, that is last ,fella. its dead last.
(read the FSM yet it says just that and for good reasons)
(and same book warning not to put i new ECU with outputs shorted)
(electronics, 101?)

most posters say replace all sensors first. that too is crazy.
are you growing money on trees"?
lets do the real list, not guessing,,,,, ok? (take a ASE course?)

  1. check fuses first.
  2. is the ASD relay dropping off line (opens) while cranking? BINGO ! if YES. the PCM will tell you why, if you just listen 100% true, every TIME. (DTC errors will dump)
  3. I then connect any scan tool made.(works on 93 and up) and crank for 5 seconds, the PCM cuts the ASD, and the PCm tells you why it did, no looking, is MAX pain for you. (i promise)
  4. never tuned up this decade? a full 60k mile listed one engine, lost the list? (sure all spark parts that dont last forever)
  5. Scan shows, CMP or CKP dead?, well it is. (5seconds cranked)
  6. The PCM will tell you they are bad, even 1 missing pulse in 10 for sure. all it takes is a scan tool , any one. made. works. this year. (old car) even $10 tools (ask)
  7. if the coil primary is dead, or the ignitor, the PCM also throws codes for that, cranked for 5 seconds. (i add 2 sec, to the 3 second rule in pcm for ASD, see why? I do that?)
  8. if say all the above is good, then the coil is bad. if spark is dead on ALL cylinders , you never said all, are bad, so..... bad inputs from you there, sorry. never check just one spark plug.
  9. that is it on spark, how did it do... real diagnosis and not one guess, ever. (tuneups are not guessing)
links
http://www.fixkick.com/Jeeps/ASD.html

WJ jeep 99
the I6 has a coil pack, for all 6 cylinders
makes spark testing harder, not impossible, but a PITA to work.
not scanning this car, is a FAILURE TO see facts.
all those P03xx errors? P0350?
even P0351 to 6. P0301 up?

but here it is
watch Youtube, are all dead.
if yes, the PCM will tell you at 90% of time.
if not the pack is bad.
the pcm reports inputs to PCM bad or reports coil pack sucks too much current then its what its telling you. believe it.
the PCM is the ignitor side to coil pack coils.
the Pcm monitors this side, fully.

Posted on Mar 31, 2015

  • 4 more comments 
  • _-__-___-_
    _-__-___-_ Mar 31, 2015

    https://www.youtube.com/watch?v=Sk_8TKMw...

  • _-__-___-_
    _-__-___-_ Mar 31, 2015

    sorry forgot the video of how to do this correctly , pack check.

  • _-__-___-_
    _-__-___-_ Mar 31, 2015

    past that in URL window of any browser made.

  • _-__-___-_
    _-__-___-_ Mar 31, 2015

    paste.

  •  johnny rebel
    johnny rebel Mar 31, 2015

    THANK YOU CADAVER FOR THE COMMENT,NOT NICE,I GUESS I WILL FOOLOW YOU AND CRITISIZE YOU FOR AWHILE,WHERE IN "Changed engine in 99 jeep grand cherokee larado 4.0 engine now no spark"" DOES THE POSTER STATE THAT IT WAS THE SAME MOTOR??HE DOESNT,I HAVE 4 JEEPS,I SWITCHED MOTORS IN 2 OF THEM,I NEEDED THE ECM BECAUSE THEY WERE DIFFERENT SIZE MOTORS,SO,WHEN I DONT HAVE MUCH INFO I GO WITH WHAT I KNOW,IF IT WOULDVE STATED SAME 4.0,THEN THAT IS A DIFFERENT STORY,I WOULDVE SAID CHECK THE FUSES,ALSO WHEN YOU GET A SWAPPED MOTOR YOU GET THE ECM WITH IT,THANK YOU AGAIN,I CANT WAIT TO HUMILIATE YOU!!

  •  johnny rebel
    johnny rebel Mar 31, 2015

    nice name change jambalaya!! you might want to check terms of use of fixya cadaver

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  • Jeep Master
  • 10,875 Answers

Did you replace the computer that goes to that motor?? you need to

Posted on Mar 31, 2015

  • 9 more comments 
  • shannon stewart Mar 31, 2015

    no. it turns over just no spark

  •  johnny rebel
    johnny rebel Mar 31, 2015

    you need the onboard computer or it will never run

  • shannon stewart Mar 31, 2015

    what is the onbored comp

  •  johnny rebel
    johnny rebel Mar 31, 2015

    http://www.ebay.com/itm/1999-Jeep-Cherok...

  •  johnny rebel
    johnny rebel Mar 31, 2015

    go to url

  • shannon stewart Mar 31, 2015

    oh i didnt know u had to change that when you changed engine bc i changed motors without haven to. is it just this engine u have to do this

  •  johnny rebel
    johnny rebel Mar 31, 2015

    all motors that are controlled with a computer,especially if it is a different size motor

  • shannon stewart Mar 31, 2015

    same motor same kinda jeep i changed a motor in a grand am last month and in a aztek 3months ago and didnt change comp

  •  johnny rebel
    johnny rebel Mar 31, 2015

    check coils and control plate under coils

  • coady
    coady Mar 31, 2015

    take it to someone with a diagnostic computer to read the codes. it will save you alot from wasting time and money.

  • shannon stewart Mar 31, 2015

    my husbands grandpa has a hand held one like auto zone will that work

×

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SOURCE: HOW DO I CHANGE THE WATER PUMP ON A 99 JEEP GRAND CHEROKEE ?

At least you have the 4 liter 6. Once you get all the **** out of the way its like replacing a W/P on an "old school" engine, very much like a Ford or Chevy straight 6. 1) Remove radiator top retainer (the metal U that looks like its the top of the radiator (#13 or 14mm sockets I think). 2) To completely get if off you also have to remove the grill (4-6 phillips screws), then 3) unbolt it from the tubular bumper retainers underneath the grill. 4) DO NOT remove the latch cable - no need. 5) Remove the top bolts holding down the fan shroud. Lift the shroud off its bottom "tabs" and push over the fan. 6) Using #10mm socket remove fan from fan clutch, then remove bolts holding fan clutch onto water pump pulley. 7) Pull out shroud, then fan, then fan clutch. Be very patient, lots of wiggling may be needed. 8) Locate belt tensioner on idler puller below the Power steering pump. Losen very little the pulleys center bolt (10mm), then use a 10mm w/entension to losen the pulley's tension (use counter clockwise/normal rotation to losen). 9) Draw a diagram of the belt routing - you will Never remember it correctly otherwise. 10) Tap the w/p pully and pull if off - do not hit radiator fins! 11) Drain the radiator (clockwise/right rotation opens petoc from factory radiators - counterclock used on aftermaket rads). 12) Remove lower raditor hose at radiator, then at pump (it will be a challenge). 13) Remove upper radiator hose from rad and from thermostat housing. 14) losen the Rubber heater hose from the metal hose screwed into the W/P. 15) Remove 4 bolts from W/P (13 or 14mm I think). The one at the 4oclock position is longer than the others. One is hidden at 6oclock.
16) Remove 2 bolts (14-15mm??) on bottom of Power Steering mount - these go through the W/P case to the block. You may also need to losen the top PS bolts so the PS Bracket can be loose at the W/P case. 17) Wiggle the W/P out from under the PS bracket. and pull off. (16b if needed, remove the upper idler pulley near the A/C unit.) 18) Remove the Thermostat (upper hose return) housing. Scrape off old gasket. Replace with 160deg or 190deg thermostat. Use silicone on gasket. 19) Carefully use a 17 or 19mm box wrench to remove the metal heater hose return line from the upper part of the old water pump. Coat threads with spark plug thread antiseize and screw onto new W/P. 20) Install new W/P gasket w/silcone, be careful to Not block the water holes. 21) Slide W/P under the P/S bracket and jiggle into place. Hand thread one of the top bolts to hold the W/P in place. 22) Insert the P/S bracket bolts and lightly tighten. 23) Jiggle W/P around and insert other bolts, start with the 6oc hidden bolt. Add remaining bolts and tighten to 25 or 250?ftlb (about 3/4 past socket-snug). 24) Tighten ALL P/S bolts. 25) Adjust metal heater pipe. Reinstall rubber heater hose. 26) Reinstall W/P pulley and Fan clutch, and upper idler if it was removed. 27) Thread NEW Belt on pulleys. 28) Tighten tension on idler. Tighten idler axle bolt. 29) Install lower rad hose. 30) Slide shroud over pulleys. 31) Install fan on clutch. 32) Clip shroud retainer bolt mounts back on top of radiator. 33) Install shroud. 34) Connect upper hose. 35) Reinstall radiator retainer. 36) Bolt retainer to Tubular bumper mounts. 37) Reinstall grill. 38) Wonder where the extra bolts etc are supposed to go. 39) Cuss - pray -cuss - pray. 40 ) sip some beer. 41) carefully inspect everything to ensure its back to the way it looked before (several pictures from a digital camera taken during the disassembly will help). 42) Close the rad petok. 43) Add 1 gallons of antifreeze. 44) Start engine and add another gallon of A/F. 45) Turn heater controls to HOT inside (no need for fan). 46) Water guage should show 180 to 210F. 47) Add 1 gallon of water. 48) Install New 18PSI rad cap. 49) Turn off engine and add water or A/F to overflow tank. 50) 1 hour later open Cap to see if level has settled. Add Water as needed to fill rad.

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SOURCE: 1996 Jeep grand Cherokee Larado, rear door stuck

go throu licence plate pannel pull up on bar and on the inside under ur pannel the nut fell off the mechanism so just put on a new nut

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SOURCE: Changing spark plug wires on 2001 Jeep Grand cherokee

yah direct ignition coil pack does away for the need a a distributer cap and rotor.much higher energy ignition system where the computer tell when to fire.if that helps.not hard to change.as long as you change them one at a time so you don't screw up the order.

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SOURCE: Where is the camshaft sensor located on my 99 Jeep Grand Cherokee

If you still have a cap rotor and ignition wires, it's inside the distributor. If not, it is the part where the distributor used to be (center rear of the engine behind the intake manifold)

Posted on Feb 19, 2010

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SOURCE: 99 jeep grand cherokee no start 4.0L no power to

Check the auto shut down (ASD) relay located in the power distribution box.

Posted on Jul 23, 2010

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