04 Jeep Grand Cherokee won't start

Tiny
04 JEEP
  • MEMBER
  • 2004 JEEP CHEROKEE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 85,000 MILES
04 grand Cherokee won't start. Just replaced governor pressure relay and solenoid due to 1756 code. Also replaced spark plugs. Ran great for a day. Now won't start and no codes. Thinking might be MAP sensor?
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Sunday, July 10th, 2011 AT 6:21 AM

12 Replies

Tiny
DANLESABRE
  • MEMBER
Does the engine turn?
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Sunday, July 10th, 2011 AT 6:42 AM
Tiny
RASMATAZ
  • MEMBER
If its cranking over and will not start check the fuel pressure if its within specs and injector pulses and spark.
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Sunday, July 10th, 2011 AT 7:31 AM
Tiny
04 JEEP
  • MEMBER
Checked fuel. Ok. What is the best way to check spark with coil rail?
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Monday, July 11th, 2011 AT 11:54 PM
Tiny
RASMATAZ
  • MEMBER
Use a spark tester-ST-125

Disconnect the plugwire on the sparkplug and ground it and have helper crank engine over and look for a snapping blue spark

Is this a DIS or COP ignition system?
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Tuesday, July 12th, 2011 AT 12:03 AM
Tiny
04 JEEP
  • MEMBER
What is the difference between the two and where do I find out?
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Tuesday, July 12th, 2011 AT 12:20 AM
Tiny
RASMATAZ
  • MEMBER
The COP is where the coil seats right on top of the sparkplug-The DIS is coil packs and wires to the sparkplugs
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Tuesday, July 12th, 2011 AT 12:31 AM
Tiny
04 JEEP
  • MEMBER
Cop
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Tuesday, July 12th, 2011 AT 12:36 AM
Tiny
04 JEEP
  • MEMBER
Don't have help with testing coil rail right now. Any other thing I can test?
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Tuesday, July 12th, 2011 AT 12:37 AM
Tiny
04 JEEP
  • MEMBER
Also tested all fuses. Will the governor pressure sensor or solenoid not allow the car to start. These are the first two things after it wouldn't start the first time.
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Tuesday, July 12th, 2011 AT 12:40 AM
Tiny
RASMATAZ
  • MEMBER
Do this below

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing

If both fuel and spark is present-check the valve and ignition timing, this will lead you to problems
with compression and valves opening and closing at the wrong time/broken or jumped timing
belt/chain.
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Tuesday, July 12th, 2011 AT 12:48 AM
Tiny
04 JEEP
  • MEMBER
Ok will do thanks for your time
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Tuesday, July 12th, 2011 AT 12:50 AM
Tiny
04 JEEP
  • MEMBER
Ok tested coil pack. Is it possible the whole rail went bad?
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Tuesday, July 12th, 2011 AT 1:03 AM

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