Drove it home from work one night last week and it ran fine, no miss, nothing. When I got in it to go to work the next day, it wouldn't start. It will turn over but won't start, not even putting starting fluid straight into the throttle body. It wont fire at all. Checked coil rail and plugs. They are all good. Replaced crankshaft sensor and camshaft sensor but it still will not start.
Welcome to the magic of Jeep world. and ASD.
if compression at spec. (called a good engine)
and spark is good, it will start (can site exceptions)
The no new spark plus,? are the old owns white or black?
The car 2000 and any scan tool (yes, get one) will tell you why it wont start. the ASD drops out.!
all jeeps 93 to now the ASD drops out after 3 seconds cranking
if the relay does drop, there and then all spark and injections END.
BY DESIGN.. (so we look there first. then scan it)
there are up to 8 DTC that can end ASD validations.
you car may not have all 8 but is not imporant, only the DTCs thrown after 5 seconds cranking matter. now.
buy one, rent one, barrow one, or ??? well nobody want to tow it sure. so have one on hand at all times, if tow charges are an issue for you.
all cars made report CMP or CKP errors 1 in 10. the key is to look.
and see it live , cranking,
watch out for using the silly jeep , key-on-off, bs code way.
it clears many spark and cpk/cmp errors, at key off.
only a scan tool never fails to work. hint hint...
htt p://wwwxfixkickxcom
httxp://wwwxfixkickxcom/Jeeps/ASDxhtml
replace the 4 x with dots and bingo. ASD all rules,!
htt p://www fixkick.com/Jeeps/ASD html
h t t p://wwwxfixkick.com/Jeeps/ASDxhtml
very hard to post data pages, here, very hard. and is key to diangosis
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Pull one wire at time and see if you get spark while someone cranks engine- make sure you got gas- check fuel at fuel rail by pushing the vent ( looks like tire valve') ............happy trails
If you spray starter fluid in the throttle body, it should have started . it is not getting any spark to burn the starter fluid
SOURCE: 96 jeep grand cherokee 4.0
change the computer .... PCM get a used one it fixed mine had same problem
SOURCE: 2001 Jeep Grand Cherokee code P1391
I would check to be sure that the timing chain hasn't jumped at all ..
SOURCE: 99 Jeep Cherokee Sport, 4.0L -won't start
you need to have it connected to an OBD2 machine and watch if you are missing the cam sensor showing RPMs
or if your missing crank sensors RPMs,
it could be a wiring problem or computer if your seeing the RPMs from both sensors,and the last thing i would check is hooking up a fuel gauge to the reed valve and watch what fuel pressure you have while cranking,if the cam sensor is the culprit it will turn the fuel off after the cranking.
SOURCE: My 2000 jeep grand cherokee
There are many things to do with the engine management system the when the ECM light comes on it can kill the engine. You can go to an autoparts store and they will read the codes for free. Get the code number and description. let me know, i will help. Randy
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Hi Charlotte Mace, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?
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