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Unread 01-14-2008, 07:19 PM   #1
treed41
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97 Grand Cherokee won't start, no fire

I have a 97 Jeep Grand Cherokee, 93,000 miles and it would not start this morning. Recently replaced the battery and has ran fine for about 2 weeks. Its getting fuel to the fuel rail, but no fire at the spark plugs. I replaced the rotor and rotor cap, but no luck. After reading many forum entries, it seemed that the crankshaft position sensor resolved many problems with the cherokee not starting, so I replaced that but still no luck. I took the connector off the coil, and I have no voltage at that connector. I think I'm checking it correctly, and if I am there is no voltage going into the coil. Shouldn't there be 12V? Also checked all the fuses at the fuse block under the hood, and they all check out good. How can I verify the voltage at the coil, or what else can I check?

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Unread 01-14-2008, 07:43 PM   #2
greasefingers
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Pull the codes first:
Older (OBDI) models - Start with the ignition off. Within five seconds, switch the key on, off, on, off, on. ("On" is NOT "Start" and "Off" is NOT "Lock"). The "check engine" light will flash. Count the flashes. Each code is a two digit code, so a (for example) 23 would be FLASH FLASH (pause) FLASH FLASH FLASH (long pause). It will never flash more than 9 times, so watch for those pauses!

Newer (OBDII) models - Put the key into the ignition, push down the odometer reset button, then turn the key to RUN with your finger on the button - and then release the button. The odometer will go through 1111111 through 999999, then display the car's serial number. It will then show the error codes (it might show them starting with P). If this method does not work, try the OBDI method.
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Unread 01-14-2008, 10:00 PM   #3
treed41
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I have tried both methods, multiple times but can't get any diagnostic codes to flash. I feel like I'm following the correct procedure, but after multiple tries, I still can't get anything to flash.

Would a diagnostic meter be able to provide the codes? Hate to purchase one and only use it 1 time, but it might be worth it.
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Unread 01-15-2008, 12:31 AM   #4
Jon08JK
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What about your battery connections, have they worked loose from two weeks ago getting a new battery????
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Unread 01-15-2008, 05:02 AM   #5
Texas ZJ1
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If it tries to turn over but doesn't catch, ignition coil.


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Unread 01-15-2008, 06:20 AM   #6
Rockdaddy
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If there inst power to the coil, replacing it wont help. Need to find the issue with out power to coil
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Unread 01-15-2008, 07:25 AM   #7
treed41
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Battery connections are fine. The starter turns at the proper speed to start the car.

Everything keeps coming back to the coil, and no voltage getting to it. Since I replaced the CPS, I'm wondering if that can stop the flow of voltage to the coil, if the air gap is not set right?

Also, what is the proper way to check the voltage at the coil? I'm have been disconnecting the leads going to the coil, turning the ignition to the on position, and checking for voltage. Nothing is there no matter how I hook up my meter. I know the meter is working correctly because I get 12V at the battery, and 5.10V at the CPS connector.
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Unread 01-15-2008, 09:15 AM   #8
greasefingers
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Since the automatic shutdown relay feeds power to the fuel pump, injectors, and coil; then I would first swap out the A/C relay with the ASD relay.
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88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 01-15-2008, 09:34 AM   #9
Pretty C
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The engine coil is a 40 dollar part. I would replace it; i had problems with my 94 at 120 thousand miles. Do you have a I6 or a V8?
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Unread 01-15-2008, 11:40 AM   #10
treed41
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I think the ASD relay might be faulty. I switched the ASD and the A/C relay, along with re-connecting the CPS and coil plug sockets, and it started up after that.

It seems to not like the cold weather, so will wait a few more cold mornings (if we get anymore of those in Texas) and see if it fails again. If it does, will probably switch out all the relays just to cover my bases.

Thanks for everyone's help for now, and if I have additional problems I will reply to this post.
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