Jeep died while driving. Wont start. Garage said they couldnt communicate with the computer. I replaced the computer and coil. I am getting no spark. I tried the turn on / off/ on /off / on to get the codes but it doesnt work. Any ideas what to check next? Replaced crank sensor a little over a year ago. Replaced wires/ spark plugs then too.

SOURCE: 93 Jeep Grand Cherokee Won't start

Are you getting spark from coil wire when cranking? If so, check the cap & rotor. If not, the most common failure is the crank sensor. If you have a 4,0, you can find it on the drivers side of the bellhousing, in line with the flywheel, just where it's annoying to work on. There is a test you can make, but I don't have the specific test values or the correct terminals to check. (you can find that info in any half decent manual.
Good luck

SOURCE: 1993 grand am no spark

You said you changed the ecm module, is that the ecm or the ignition module. Do you have access to a scanner to check cranking rpm? That way you can test the new crank sensor and the wiring and the ignition module.

SOURCE: 1993 jeep grand cherokee will not start

Check to see it maybe a head gasket .mine was

SOURCE: no spark at coil

check ignition pick-up coil and ignition module

Marvin

• 85242 Answers
• Posted on Apr 03, 2009

SOURCE: 89 jeep cherokee 4.0 cranks and gets fuel but no

the part that is known to fail in these engines that causes no spark is the Crankshaft position sensor, it is located on th right side of the bell housing as u stand in front of truck, it must be changed from below the truck and is very difficult to get at, here is a photo of the sensor and a brief description of the repair