1990 Jeep Cherokee New motor no start

Tiny
REDNECKABBOTT
  • MEMBER
  • 1990 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 210,000 MILES
1990 4.0 cherokee with 1994 4.0 grand cherokee engine. Never has ran since the swap. Wasn't getting spark til I ran jumper wire from coil. Still turns over but no crank.
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Tuesday, April 14th, 2009 AT 8:59 PM

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Tiny
RASMATAZ
  • MEMBER
Disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, 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, distributor pick-up coil, ignition control module, ECM, Ignitor cam and crank sensors- Note: If it doesn't apply disregard it
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Tuesday, April 14th, 2009 AT 11:21 PM
Tiny
JNOVACK
  • EXPERT
It sounds to me like a bad pick-up coil but you do need to check fuel pressure should be 40-45 psi when you turn the key on
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Wednesday, April 15th, 2009 AT 9:39 AM

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