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1993 Jeep Cherokee cranks but wont start

Tiny
TONYBOOM
  • MEMBER
  • 1993 JEEP CHEROKEE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
My 93 Jeep Cherokee has had trouble starting for a while. At first, it was real intermittent but I could always eventually start it. Then, it seems like I had to pump the gas in order to get it to slugglishly start. Now, however, it cranks and cranks but just won't fire.

There is no spark and after reading many forums I decided to just go ahead and replace the crankshaft position sensor. I haven't put it in yet, but if this fails to get it working. What would my next step be? Ignition coil?

I should also note that the jeep has been sitting for about a year now. But I really want it working before the winter.

Thanks in advance,

Anthony
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Tuesday, October 19th, 2010 AT 3:06 PM

7 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Engine cranking check for primary voltage at the coil, smaller wire, dark green with orange tracer, should be hot. The crank sensor is one possibility, if the computer isn't grounding the asd relay. Primary voltage to the coil and other circuits, injector/s, come from the asd relay. Any applicable mil codes? Thanks for the donate.
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Friday, July 28th, 2017 AT 4:32 PM
Tiny
TONYBOOM
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  • 4 POSTS
The only code I'm seeing is code 12. Does that help?
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Friday, July 28th, 2017 AT 4:32 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Not sure if that helps. It means battery voltage has been lost at some point. Make sure the battery has a full charge and connections are all clean and tight.
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Friday, July 28th, 2017 AT 4:32 PM
Tiny
TONYBOOM
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  • 4 POSTS
Yeah, the battery lost its charge completely a month ago because it's been sitting for a while now. Took a while to recharge it but it's charged now.

Should there be another code if the Crankshaft Position Sensor is bad? I plan on trying my new one tonight.
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Friday, July 28th, 2017 AT 4:32 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
They don't always set codes when they should. I'd have to check circuits at the asd relay.
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Friday, July 28th, 2017 AT 4:32 PM
Tiny
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Sorry, but I'm pretty new to this stuff. But, how exactly do I check the ASD Relay Circuit?
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Friday, July 28th, 2017 AT 4:32 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Start by checking the voltage circuits at the relay. key on, two circuit should be hot. Then check relay ground, controlled by computer.


https://www.2carpros.com/forum/automotive_pictures/170934_jeep_cherokee_asd_relay_1.jpg

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Friday, July 28th, 2017 AT 4:32 PM

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