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Unread 07-24-2010, 06:15 PM   #1
fire1998
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97 wrangler wont start Computer problem??

My 97 2.5L Wrangler will not start. There is fuel pressure at the rails. We reset the computer and it started and ran for 2 days. Went to start it this morning and no starty!!! We tightened the grounds, 1 was loose. What can be causing the compoter to shut down?
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Unread 07-24-2010, 10:21 PM   #2
fire1998
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Anyone ever had this happen? The computer just shuts down.
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Unread 07-24-2010, 10:32 PM   #3
MJMPC
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Have you checked for codes?
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Unread 07-24-2010, 10:35 PM   #4
1jack5
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Mine did the same thing, it was the Crankshaft Position Sensor, very common on the 4.0s dont know about the 2.5s. I thought it would through a check engine light but they dont always do.

If thats not it you could always do the old "It takes 3 things for a engine to run fuel, spark, and air" and go from there....
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Unread 07-24-2010, 11:51 PM   #5
fire1998
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No codes.......No check engine light!!!
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Unread 07-25-2010, 12:09 AM   #6
oakmckinley
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Is it turning over?
I agree that it might be the CPS. I had this fail twice and it gave no check engine light either time.
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Unread 07-25-2010, 02:10 AM   #7
Dans95ZJ
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I'd put a buck on the CPS.
When you check for the three things and don't get spark, but the coil is good, disconnect the CPS for a while and then put it back. If it starts, great - change the CPS because it wont last.
I had this on my ZJ and I couldn't figure it out for months. Good thing the YJ was working!
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Unread 07-25-2010, 02:33 AM   #8
DezDiggler
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Is it manual? Can you roll start it? Have you tried jumping your starter to rule out ignition? What made you check the fuel pressure?
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Unread 07-25-2010, 02:35 AM   #9
DezDiggler
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I just had similar problem and it turned out to be my clutch safety switch. Full power, but turn key and nothing.
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Unread 07-25-2010, 08:21 AM   #10
fire1998
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It will crank, but will not start. Plenty of battery power.
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Unread 07-25-2010, 08:56 AM   #11
Piratejonh
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I had a similar problem and it was the computer. However that seems to be rare.
CPS is a better bet.
Clutch safety switch will prevent power going to relay for the starter, so if it turns over and doesn't start I would look elsewhere.

My clue was the OBDII scanner would not interface with the computer. (And had replaced CPS, checked connections, ruled out starter and ignition)
Oh and in case it comes up, '97 PCM is plug and play, no programming necessary.
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Unread 07-25-2010, 09:07 AM   #12
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there is no way we can help you if you dont help yourself first.
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Unread 07-25-2010, 09:24 AM   #13
Ghaniba
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Your symptoms are the same as mine, that it cranks but won't start. Mine died while going down the road the other day. no warning, no sputtering, just off, coasting to the side of the road where she was towed home.

I've found I've got fuel, but no spark. I changed my CPS since I heard they die often, and it made no difference. My code that was thrown on the event was P0351 and then every cylinder misfire happened at that time too. After clearing the codes, I don't get any codes while I crank it.

I'll post in your thread if I find what's causing mine, perhaps it'd help yours too! I'm hoping it's not the ECU!

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Unread 07-25-2010, 09:34 AM   #14
1jack5
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Quote:
Originally Posted by Ghaniba View Post
Your symptoms are the same as mine, that it cranks but won't start. Mine died while going down the road the other day. no warning, no sputtering, just off, coasting to the side of the road where she was towed home.
See mine did this EXACT same thing and it was my crankshaft position sensor.
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Unread 07-25-2010, 06:23 PM   #15
Dead_End
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Had the same problem, and it was the CPS. Just replaced it today
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