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I’ve had two Nissans as of this writing. Both have had electrical “quirks.” Here are some of the fixes:
PROBLEM 1: Erratic idle, missfire, driveability issue
The 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.
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.
PROBLEM 2: Stumble/Bog at 3200rpm
FIX: MAF needs a thorough cleaning. No pics, sorry. Stumbled at certain RPM, regardless of road speed, or throttle position.