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Old 02-02-2013, 11:37 PM   #1
SkinnyG
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Join Date: Sep 2008
Location: Okanagan Valley - Canada, eh?!
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Vehicle: 1994 Hardbody
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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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