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Old 02-02-2013, 11:37 PM   #1
SkinnyG
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Default FIX: erratic idle, low speed driveability, possibly more

(QUESTION for Admin: Should this be in Electrical, or Engine & Drivetrain? - It's an electrical problem, but it's related to Engine and Drivetrain. Please move (or cross post??) as you see fit.)

PROBLEM: Erratic idle, missfire, driveability issue, possible stalling.

My truck would sometimes idle at 1500 rpm for no reason. It would also sometimes surge/buck/fart at low speed cruise. Sometimes a re-start would fix it. Sometimes a quick rev in neutral would fix it. It seemed to be returning more frequently, and getting worse.

The Snap-On MODIS at work suggests ripping into the wiring harness, near the back of the valve cover near the firewall. It says there is a crimp connection in there that runs the injectors. The connection may ~look~ good, but cut it apart and resolder it. So I did.

FIX:



Remove the air filter.* This connection was previously "tweaked" by me with a couple zap straps.* That's the bundle I'm going into.



Unsheath everything.* You will find two connections taped up.* I opened up both.



There five white wires are crimped together near the top.* Below them, you can see some green wires crimped together.



I cut the connection out, and wrapped the wires all together after sliding some heat-shrink tubing up and out of the way (not shown).



Then soldered.



Then heat-shrink tubing.



The white wires are next - vice-grips holding the heat-shrink tubing out of the way.



And heat-shrunk.



And then re-wrapped.

Here's what the wires actually do:



RESULT: Smoother idle, no return of the weird cruise issues or 1500 rpm idle. Cold-start fast-idle works much happier.
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Last edited by SkinnyG; 03-14-2018 at 10:59 PM.
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Old 02-03-2013, 12:05 AM   #2
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This is what I referred to in the pictures posted to this forum!
http://www.infamousnissan.com/forum/...ad.php?t=25108

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Old 02-03-2013, 12:13 AM   #3
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OH SWEET MOTHER OF NISSAN!

THAT is super helpful!

Makes TOTAL sense now, now that I know what the wires DO.

AWESOME!
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Old 02-03-2013, 01:06 AM   #4
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anything for Z24i? i checked at work and found nothing. ive got the same problem, it will buck bad once if i accelerate hard or when i cruise at around 2000rpm. so to accelerate, i have to short shift to make it not jerk. it only happens every 3 or 4 months for a week at a time which is odd

a couple of days ago it started happening again, and yesterday i gave every wiring harness connector in the engine bay a tap and went for a drive after and immediately the problem went away.
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Old 02-03-2013, 02:34 AM   #5
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In searching, I found the same sort of thing for the early Z24 - the harness issues were (in the forum I found) on the passenger side of the engine compartment, near the fuel filter sort of thing.

Linkie: http://forums.nicoclub.com/86-5-z24i...d-t491625.html

Imagery (not mine):



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Old 02-03-2013, 03:24 AM   #6
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thanks for the info, gonna check those harnesses tomorrow. i usually nudge some wires changing the oil filter in that area so that might be causing it
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Old 02-03-2013, 04:08 AM   #7
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Switched pictures to Photobucket for the time being.
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Old 02-03-2013, 04:00 PM   #8
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i just saw this bulletin from a link dvdswan posted the other day, basiclly the full img of what cbohannan posted
thanks for doing the real work and pics skinnyg i love this forum!



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Old 02-03-2013, 05:18 PM   #9
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they also have answered it on http://www.nissanforums.com/hb-truck...ut-solved.html
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Old 02-03-2013, 06:53 PM   #10
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If I could figure out how to post more I would! My shop's data software is a straight a-hole when it comes to sharing.
I can post any of the diagrams, but i cant get any words to save or even give me options related to saving...
Anyway, glad you got some good info Skinny G.
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