Forgive me father, I have sinned - Page 3 - JeepForum.com

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post #31 of 55 Old 03-24-2014, 08:42 PM
ZeeJay1997
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to find this, you'll need to set up the meter on each sensor and monitor the output during the stall.

i went through all of this with my stall

does this look like the right diagram? if it is, i lied about the sensor ground. one i had seen before wasnt the same.



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post #32 of 55 Old 03-24-2014, 09:06 PM Thread Starter
sparkieCHB
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Thanks for the diagram zee, I have the same one in my Haynes. I guess I'm going to have to spend a few hours with that diagram and my meter while its running, and hope I can find some irregular voltage at a sensor while it is stumbling and hiccuping.

The problem is getting worse. A week ago it was driveable, and it was difficult to get it to actually die on me, now it starts running like hell about 2 minutes after I start it and I can get it to die on command. The backfiring and smoke from the tb is new, and if I stuff the gas it will chug so hard and slow that it doesn't register rpms at the gauge and sounds like you can hear each bang in the firing order, sounds like it is getting spark knock and then dies after a burp out of the tb. I am starting to think it is over fueling, I'm going to look a little closer at the CTS and its wiring.
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post #33 of 55 Old 03-25-2014, 04:41 AM
jnowak
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For sh!* and giggles ohm out the map wires. Mine was acting up similar, and the wires had rusted inside the insulation.
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post #34 of 55 Old 03-25-2014, 05:34 AM
ZeeJay1997
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you can run test wires from the pcm into the cab and connect meter to them.

take the back shell off the pcm connector so you can back pin there.
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post #35 of 55 Old 03-25-2014, 06:53 AM
speedbucket
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Clean the IAC .if its filthy it doesn't matter if it ohms out well.

http://www.jeepforum.com/forum/f22/speedbuckets-zj-build-1361322/
V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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post #36 of 55 Old 03-25-2014, 03:16 PM Thread Starter
sparkieCHB
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Quote:
Originally Posted by ZeeJay1997 View Post
you can run test wires from the pcm into the cab and connect meter to them.

take the back shell off the pcm connector so you can back pin there.
Do you have a schematic showing the 60 pin connector and what each wire is for? I have found bits and pieces but not a complete diagram for all 60 pins.

If what I had read on here somewhere is correct #3 should be power to the PCM and I think it was #4 and one or two more were grounds. Other than that I only tested the injectors at the PCM connector.

It is a new PCM so the problem lies in the harness somewhere or at a sensor I have not yet replaced.
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post #37 of 55 Old 03-25-2014, 03:19 PM Thread Starter
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Quote:
Originally Posted by speedbucket View Post
Clean the IAC .if its filthy it doesn't matter if it ohms out well.
Entire throttle body was removed and completely cleaned, IAC pintle, IAC housing, passage way, butterfly, cleaned to the nines.

Thanks for the reply though you are definitely right about physically inspecting a sensor as well as testing it with a meter.
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post #38 of 55 Old 03-25-2014, 05:20 PM
ZeeJay1997
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the diagram i posted has 47 pins populated. i think the rest are not used.

what sensors have you replaced?
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post #39 of 55 Old 03-25-2014, 05:29 PM
ZeeJay1997
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post #40 of 55 Old 03-25-2014, 05:43 PM
dusterdude
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Vacuum leak or a timing issue me thinks
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post #41 of 55 Old 03-25-2014, 06:08 PM Thread Starter
sparkieCHB
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Originally Posted by dusterdude View Post
Vacuum leak or a timing issue me thinks
I thought timing too. Backfiring through the intake, and hard starting when warm, I'm going to pull the dist and take a look at everything, restab it on time and see if that helps.

Its running like an off time, flooded out carbureted turd.
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post #42 of 55 Old 03-25-2014, 06:11 PM Thread Starter
sparkieCHB
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Quote:
Originally Posted by ZeeJay1997 View Post
the diagram i posted has 47 pins populated. i think the rest are not used.

what sensors have you replaced?
MAP, IAC, and TPS have been replaced with new parts, along with the PCM, cap, rotor, plugs, and wires
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post #43 of 55 Old 03-25-2014, 06:24 PM
ZeeJay1997
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get it running and disconnect the cam sensor in the distributor. this should put on default fuel timing while in open loop. i'll have to put a disclaimer on this. i know it works on obd2s... never tried it on obd1
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post #44 of 55 Old 03-25-2014, 06:31 PM Thread Starter
sparkieCHB
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Quote:
Originally Posted by ZeeJay1997 View Post
get it running and disconnect the cam sensor in the distributor. this should put on default fuel timing while in open loop. i'll have to put a disclaimer on this. i know it works on obd2s... never tried it on obd1
I'll give it a shot
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post #45 of 55 Old 03-25-2014, 06:51 PM Thread Starter
sparkieCHB
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Well I think the starter is taking a s***. Luckily I have an early 93, with the AW4 and a parts 88 xj, the 88 has a newer starter so I'm going to try and swap them and see what's up. When I can actually get the ***** to start I'll run through some of the suggested things and hopefully figure it out.
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4.0 , hesitation , misfire , stalling , zj

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