Unsolvable problem with the WJ. HELP - Page 2 - JeepForum.com
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post #16 of 29 Old 10-21-2013, 07:11 PM Thread Starter
DakMan96
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I'm about ready to throw my jeep off a cliff. Is there anything else I can check? P1595 is killing me

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post #17 of 29 Old 10-22-2013, 06:56 AM
stonefarg-NM
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I had some similar symptoms with my 4.7 - turned out to be low fuel pressure. Replaced filter/regulator problems solved. It was throwing a different code (P0171) that made me think twice, but in the end the low fuel pressure caused the odd code. A pressure check at the rail will tell you.
Just a thought #goodluck

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post #18 of 29 Old 10-22-2013, 12:45 PM
1hotrod
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Since you stated that you smell gas, it's posssible you have a weak ignition. Have you pulled the plugs to check for fouling/ carbon deposits? Or possibly a fuel delivery problem like large variations in fuel presssure. Check fuel rail pressure with a gauge, not sure what it is supposed to be, but I would guess between 50 and 60 psi. I sure someone here can help you with that number. Anyone??
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post #19 of 29 Old 10-22-2013, 12:50 PM Thread Starter
DakMan96
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Quote:
Originally Posted by 1hotrod View Post
Since you stated that you smell gas, it's posssible you have a weak ignition. Have you pulled the plugs to check for fouling/ carbon deposits? Or possibly a fuel delivery problem like large variations in fuel presssure. Check fuel rail pressure with a gauge, not sure what it is supposed to be, but I would guess between 50 and 60 psi. I sure someone here can help you with that number. Anyone??
Great idea! I'm definitely doing this, so I'll reiterate what you just said. Anyone know what PSI I'm looking for?
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post #20 of 29 Old 10-22-2013, 03:03 PM
stonefarg-NM
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Its 49psi for the 4.7...

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post #21 of 29 Old 10-22-2013, 05:59 PM Thread Starter
DakMan96
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Its 49psi for the 4.7...

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I have the 4.0. You know that one?
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post #22 of 29 Old 10-22-2013, 06:24 PM
stonefarg-NM
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According to the FSM, either motor should be 49.2 psi +/- 5 psi on the rail test port at idle. Pressures outside the limits suggest specific problems.

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post #23 of 29 Old 10-22-2013, 06:39 PM
stonefarg-NM
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Below 44.2 is bad filter/regulator, bad pump, or other kinked/obstructed fuel line. Above 54.2 is bad filter/regulator. My pressure was 35 so I decided to try filter/regulator & got lucky first try.

Do you have a FSM? if not, one can be downloaded @ jeepslimited.com I think there's a registration and small server fee. Good source of info.
Good luck

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post #24 of 29 Old 10-23-2013, 12:08 AM
rep-tile
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Forget about P1595, it's a fluke. Now how corroded are your battery cables?
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post #25 of 29 Old 10-23-2013, 08:46 AM Thread Starter
DakMan96
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Originally Posted by rep-tile View Post
Forget about P1595, it's a fluke. Now how corroded are your battery cables?
They were cleaned a couple months ago so not too terribly bad. Could they cause the code to throw? But how would this explain the stalling and lack of power?
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post #26 of 29 Old 10-23-2013, 08:04 PM
rep-tile
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Quote:
Originally Posted by DakMan96 View Post
They were cleaned a couple months ago so not too terribly bad. Could they cause the code to throw? But how would this explain the stalling and lack of power?
The ECU controls anything from ignition timing to air/fuel ratio to ability to maintain idle, and it particularly doesn't like low voltage, so there you go. That can easily explain stalling, lack of power, and bogus codes; and that would be the very first thing I'd check.

These are battery cable connectors I just pulled out of my WJ that didn't look "terribly bad" on the surface. Turns out they were 95% corroded...
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post #27 of 29 Old 10-23-2013, 08:14 PM Thread Starter
DakMan96
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Originally Posted by rep-tile View Post

The ECU controls anything from ignition timing to air/fuel ratio to ability to maintain idle, and it particularly doesn't like low voltage, so there you go. That can easily explain stalling, lack of power, and bogus codes; and that would be the very first thing I'd check.

These are battery cable connectors I just pulled out of my WJ that didn't look "terribly bad" on the surface. Turns out they were 95% corroded...
Might be the best advice yet, now I need to get my lazy self to do it. I have the flu right now but I still might try tomorrow to at least get a good look at it. Thanks a ton man
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post #28 of 29 Old 10-23-2013, 08:59 PM
new2site
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Quote:
Originally Posted by rep-tile View Post
These are battery cable connectors I just pulled out of my WJ that didn't look "terribly bad" on the surface. Turns out they were 95% corroded...
Mine were just like that...totally corroded on the inside... just suggested this could be problem to someone else here and it WAS (different issue though).
Take a wire brush to the corroded wires / baking soda-water mix / contact cleaner too..if you have some.

As you know these WJ's have dual cables for each terminal so you either mickey-mouse your cables to fit some "standard terminals" or buy whole new cable a$$embly ..or spend some time doing it this way(I did this with mine):

http://www.jeepforum.com/forum/f310/...ables-1144633/

http://www.jeepforum.com/forum/f310/...index1614.html

And for your flu: http://www.walmart.com/ip/Equate-Flu...ingMethod=p13n

This is the same as good ole Theraflu ...which was discontinued...works great (make sure to get "daytime" formula )
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post #29 of 29 Old 10-28-2013, 05:35 PM
dinorigginwj
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My 4.7 has almost the exact same drive ability concern as the original poster. Very interested to see how this turns out. I have suspected fuel pressure issues as well as battery terminal corrosion. If I fix mine I'll post results.
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