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90 cherokke cranks but wont start

   
Old Aug 27, 2009 | 08:03 PM
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Default 90 cherokke cranks but wont start
my 90 cherokee laredo 4.0 cranks but wont start. the coils good but i seem to have no spark. the fuel pump is good. it doesn't even attempt to start. what could it be.
thanks.
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Old Aug 27, 2009 | 08:09 PM
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crankshaft position sensor??
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Old Aug 27, 2009 | 08:28 PM
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Originally Posted by captainwoot
crankshaft position sensor??
ok how do i test it
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Old Aug 27, 2009 | 09:11 PM
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its not the cps. what else could it be
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Old Aug 27, 2009 | 09:12 PM
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ballast resistor?
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Old Aug 27, 2009 | 09:22 PM
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were is that located
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Old Aug 27, 2009 | 10:16 PM
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you say your coil is good but have no spark? do you have spark coming from the coil? or just no spark at all?
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Old Aug 27, 2009 | 11:05 PM
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if you pull a spark plug and lay it on the block (while hooked up, dont hold it) do you get a spark?
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Old Aug 28, 2009 | 12:12 AM
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i tested the coil like my haynes book told me to do and it did what it should. when i pull a spark plug and and try to make it spark off the block it wont
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Old Aug 28, 2009 | 10:11 AM
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so you were able to verify that the crankshaft positioning sensor is working?
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Old Aug 28, 2009 | 11:16 AM
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i replaced the cps with a new one
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Old Aug 28, 2009 | 11:52 AM
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ballast resistor is a white ceramic thing mounted on the drivers side inner fender with a wire on each end. mounted with one bolt in the center.
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Old Aug 28, 2009 | 03:34 PM
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how do i test the ballast resistor
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Old Aug 28, 2009 | 03:58 PM
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not sure, i never test them. new part is only about 8 bux. free from a wrecker.

i usually carry spares. learned that from my old mopar days.
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Old Aug 28, 2009 | 04:32 PM
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i put a spark plug on the end of my coil wire and cranked it and it had no spark. does this mean my coil is bad
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