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Unread 04-11-2013, 02:04 PM   #1
Gm5moker
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97 jeep zj wont start...

I got a 97 zj with 4.0. It been hesitating like it don't want to go.well today on high way it bog down an hesitated an then died, an now it wont start.anyone have idea where I should check first?

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Unread 04-11-2013, 09:43 PM   #2
jeepyard
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You can take the thhottle body air intake hose off and pour a small amount of gas down the throttle body and see if it starts. It wont run long but if it starts and goes back dead then its most likely a fuel pump problem. If that doesnt do anything get someone to spin the engine and take a spark plug wire off and put a philips screwdriver in the plug wire and hold it close to metal and see if you have a spark while the engine is spinning over. If not it is a firing problem and most likely the crankshaft position sensor and I would recommend getting that at the dealership rather than getting one at a parts house. Hope this helps!!
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Unread 04-11-2013, 09:56 PM   #3
newfieZJ
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I'd say fuel pump first too , sure sounds like it .
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Unread 04-11-2013, 09:56 PM   #4
Gm5moker
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Found out why it would not start it was a 20a fuse that blown in the fuse box in engine.not sure what it went too but, kept it from starting. It still sputtering some tho.
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Unread 04-11-2013, 09:57 PM   #5
newfieZJ
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which fuse ? might be a coincidence
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Unread 04-12-2013, 09:13 AM   #6
Gm5moker
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It was the little yellow 20a fuse next to the blue 15 fuse.
forumrunner_20130412_111256.jpg  
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Unread 04-12-2013, 09:57 AM   #7
JS97ZJ
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Check the wires going to the down stream 02 sensor. That fuse protects the computer. Don't keep replacing it until you find the shorted wires.
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Unread 04-12-2013, 01:55 PM   #8
Gm5moker
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It keeps blowing thar fuse. Is it going to that o2? Where else should I look at?
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Unread 04-12-2013, 04:19 PM   #9
JS97ZJ
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The pic you show doesn't match the 97 JGC PDC. ??Here is the dia from the FSM.
F#20 is the fuse that protects the PCM. The yellow plastic piece that is in the pic is F#17, which goes to the transmission solenoids.
The PCM provides 5v to all the sensors, transmission, TPS, MAP, 02s, Cam, Crank, Temp sensors. It usually a problem with the 02 leads, getting worn through by the drive shaft causing a short. It can also be a wire that has worn though due to a sensor that has been re routed incorrectly. Check around the exhaust and bell housing. If you keep replacing the fuse without first relieving the short, you could fry the PCM.
pdc.png  
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Unread 04-13-2013, 11:53 AM   #10
Gm5moker
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I pull a code p0138 I check all the wires they seem OK.
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Unread 04-13-2013, 11:55 AM   #11
Gm5moker
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Should I pull the black plastic off all the o2 sensor an check them. Nothing look like it was hanging on drive shaft
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Unread 04-14-2013, 02:41 PM   #12
JS97ZJ
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Quote:
Originally Posted by Gm5moker View Post
I pull a code p0138 I check all the wires they seem OK.
If you were able to pull a code off the PCM, you have power to the PCM.
What # fuse is blowing out?
Are you getting spark?

The p0138 code is a transmission sensor high voltage sensing code. A possible open to the transmission solenoids.
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