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Unread 01-08-2014, 06:05 PM   #1
JerrodA
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Join Date: Jan 2014
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98 Cherokee wont start

I have a 1998 Cherokee sport 4.0 straight 6. It wouldn't start the second morning of cold spell (started fine first morn). So I moved it into garage to warm it up. Been there for two days and still won't start. Power seems fine, turns over, not getting fuel and or spark. Tried starting fluid and even a little gas in intake and still nothing. Any thoughts?

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Unread 01-08-2014, 11:48 PM   #2
jnicewan
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Did you verify no fuel or spark? As in no fuel pressure and no spark out of plug wires? If so check the relays, swap ASD relay with another relay in fuse box, like horn or A/C and see if that's it. If still no start you might test the crank sensor or replace it. The crank sensor is near the top LH/drivers of the trans bell housing where the trans mounts to engine. If you are not sure about fuel or spark, depress the throttle a little bit and try to start again, if that helps check the IAC valve for proper op, replace or clean for results. If you think it might be flooded then hold throttle to floor and attempt to start, release throttle if it starts.
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Unread 01-09-2014, 10:53 AM   #3
JerrodA
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Thank you for response! Replaced crank sensor (that was not fun). Still same results. Unfortunately, like a dips#&t, I did not check and find out that I had no spark from plug wires before I did all that. So back to no spark, what should I check next?
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Unread 01-09-2014, 02:59 PM   #4
jnicewan
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Quote:
Originally Posted by JerrodA View Post
Thank you for response! Replaced crank sensor (that was not fun). Still same results. Unfortunately, like a dips#&t, I did not check and find out that I had no spark from plug wires before I did all that. So back to no spark, what should I check next?
Well, don't just check spark at plug wires, if you don't have spark there then check at coil too, that way you aren't missing something like a bad coil, coil wire, rotor etc. Is the problem still no fuel and spark, or are you not sure about fuel? Did you swap the ASD relay with another one yet, check all fuses, grounds, batt connections?
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Unread 01-09-2014, 03:09 PM   #5
JerrodA
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I did swap the ASD relay, checked all fuses under hood and all the ones I thought it might be on interior fuse panel.
As far as fuel, I'm still not sure I'm getting any. As you can probably tell, I'm learning ad I go. I'll go check coil.
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Unread 01-13-2014, 07:17 PM   #6
laybackman
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Unplug the VSS sensor on the side of the tranny. If it starts the VSS sensor is NG. It is on the same 8 volt circuit as the crank and cam sensor. When it shorts out the engine will turn over but will not start. AND it will not blow out any fuses.
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Unread 01-14-2014, 08:40 AM   #7
JerrodA
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I gave up and had it towed yesterday. Mechanic said it was a group if wires up under dash that short circuited ( I got that info second hand ). I will post actual diagnosis/ fix when I pick it up and talk to him. Thanks guys for the help.
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