Crank No Start 97 4.0 L6 HELP PLEASE - JeepForum.com
 
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post #1 of 8 Old 09-25-2017, 06:36 AM Thread Starter
ashwillfixit
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Crank No Start 97 4.0 L6 HELP PLEASE

I have a 97 cherokee 4.0 L6
I'm currently getting a crank no start condition and I need help on what I should replace first or how I can maybe test things to see where to start. I did a head gasket, tune up and freeze plug job on it a couple months ago. Before and after that I was having low fuel pressure. When the crank no start problem started I immediately ruled it to the fuel pump and just replaced that. Now it has proper fuel pressure but still won't start. I'm getting codes p0123, p0118, p0320, and p0171. One of those is the CPS and another is the TPS. During my checks I found I am not getting spark so I checked under the new distributor cap... completely worn from the play in the distributor. Replaced cap and rotor again under the warranty. Still no spark no start. I'm debating on whether or not I should start with replacing sensors or go for a new distributor. Please help.

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post #2 of 8 Old 09-25-2017, 06:49 AM Thread Starter
ashwillfixit
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bump please help

ASH
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post #3 of 8 Old 09-25-2017, 09:32 AM Thread Starter
ashwillfixit
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This is a time sensitive project please help asap

ASH
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post #4 of 8 Old 09-25-2017, 12:07 PM
mukluk
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OBD2 codes: https://www.quadratec.com/jeep_knowl...article-39.htm

P0118 indicates the coolant temp sensor voltage is too high
P0123 indicates the throttle position sensor voltage is too high
P0171 indicates the bank 1 upstream sensor is reading too lean
P0320 indicates no signal from the crank position sensor is being received during engine cranking

The most likely cause of your problems is a bad common sensor ground. Assuming the wire colour codes are the same between a TJ and an XJ, the ground wire at the TPS/CKS/ECT will be the brown with yellow stripe -- you need to verify you have a good low resistance ground from each sensor connector and through the black PCM connector at pin A4 (top row, fourth from the right, still a BR/YL wire).

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2005 LJ Rubicon
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post #5 of 8 Old 09-25-2017, 01:03 PM Thread Starter
ashwillfixit
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so i should ignore the play in the distributor for now and just test the ground wires?
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post #6 of 8 Old 09-25-2017, 02:24 PM
mukluk
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Unless the distributor shaft can be rocked back and forth axially a noticeable amount or can be rotated more than about ten degrees, focus on looking at the ground wires. The no spark condition is almost assuredly due to the lack of a crank position sensor signal during engine cranking -- without that signal, the PCM will not energise the ASD relay which subsequently disables the power going to the ignition system.

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post #7 of 8 Old 09-26-2017, 09:44 AM Thread Starter
ashwillfixit
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I checked the cables to both the cps and the tps and they are sending, receiving and grounding just fine. Now I'm thinking of going to get a cps and replace it. Thoughts? Btw the distributor does noticeably rock back and forth but it does not turn much. It rocks enough it destroyed a rotor and cap in the matter of 2 months...

ASH
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post #8 of 8 Old 09-26-2017, 10:38 AM
mukluk
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Quote:
Originally Posted by ashwillfixit View Post
It rocks enough it destroyed a rotor and cap in the matter of 2 months...
That's bad.

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2005 LJ Rubicon
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