New owner!

New owner!

Hi guys! Brand new 2001 C5 LS1 4L60E owner here. Been working on JDM/Motorcycles but never any American stuff. Specially with a big ol v8. I started working on a Cherokee and the deal on this rat chewed Vette was too good to pass up.

Anyone know how many harnesses there are and which controls what?

Rats got to the harness and not really sure which harness is which and what it does. I know I need an “engine” harness and probably a “front”? harness, as the headlights do not work at all nor does the ABS or any active component pertaining to traction and suspension control and so far with the research I’ve done, its tied with the headlight harness?? Also what’s the difference with the front ABS/EBCM harness vs the rear ABS/EBCM harness? Are they both needed or trim specific?

Also I’m currently firing 5/8 cylinders. Will do a leak down test asap and a compression test. But she sounds amazing and starts right up even on 5/8. Physically see chewed up spots on the driver side close by the 2 non-firing cylinders so it makes sense. Right passenger side was filled with toooo much pine needle to even see the harness.

With all that being said. Which harness should I replace first? The transmission harness seems to work fine. I’ve yet to test the brake lights and tail lights since I have no one to help me with that.

But I got every single light on the dash and the only codes I consistently get are these two: P0300 random / multiple cylinder misfires and P0481 for the fan 2 control.

Any help would be greatly appreciated!

TLDR: Need help prioritizing which harness to replace to get the car running and driving and what the harness is.

u/Existing-Box-7938 — 4 days ago

New Owner

Hi guys! Brand new 2001 C5 LS1 4L60E owner here. Been working on JDM/Motorcycles but never any American stuff. Specially with a big ol v8. I started working on a Cherokee and the deal on this rat chewed Vette was too good to pass up.

Anyone know how many harnesses there are and which controls what?

Rats got to the harness and not really sure which harness is which and what it does. I know I need an “engine” harness and probably a “front”? harness, as the headlights do not work at all nor does the ABS or any active component pertaining to traction and suspension control and so far with the research I’ve done, its tied with the headlight harness?? Also what’s the difference with the front ABS/EBCM harness vs the rear ABS/EBCM harness? Are they both needed or trim specific?

Also I’m currently firing 5/8 cylinders. Will do a leak down test asap and a compression test. But she sounds amazing and starts right up even on 5/8. Physically see chewed up spots on the driver side close by the 2 non-firing cylinders so it makes sense. Right passenger side was filled with toooo much pine needle to even see the harness.

With all that being said. Which harness should I replace first? The transmission harness seems to work fine. I’ve yet to test the brake lights and tail lights since I have no one to help me with that.

But I got every single light on the dash and the only codes I consistently get are these two: P0300 random / multiple cylinder misfires and P0481 for the fan 2 control.

Any help would be greatly appreciated!

TLDR: Need help prioritizing which harness to replace to get the car running and driving and what the harness is.

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u/Existing-Box-7938 — 4 days ago
▲ 2 r/JeepCherokeeXJ+1 crossposts

XJ no start

Hi guys, I thought my NSS switch was going bad. So I tried to bypass it but to no avail. I took apart the fuse box and grey connector to make sure it was bypassed. It refused to start. I wish I had a spare relay but I do not sadly. It does however not even click when the key is turned. But no matter which relay I use (of the same kind) the issue persists.

Could it be a bag ignition switch? I have a spare one but I don’t want to deal with the headache but I might end up having to

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u/Existing-Box-7938 — 14 days ago
▲ 4 r/JeepCherokeeXJ+1 crossposts

Interior “resto-mod”

Anyone here have any clue with fabricating a whole new interior dash? I hate the way the ‘99 interior looks. I want to achieve modern lighting but have it look like the late 80s Jeep. The interior in the ‘99 Cherokee is severely cramped.

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u/Existing-Box-7938 — 23 days ago

NP231J and Aw4

Finally got a transmission after people ghosted me so many times.

Anyone here know or recommend anything with the transfer-case and transmission? Specifically maintenance wise? And dumb it down a bit please. New to the entire 4x4 scene. Coming from single turbo rotaries and motorcycles🤣

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u/Existing-Box-7938 — 1 month ago

Figuring out intake

Anyone else here know where I can mount the intake? I want a spare battery in the current intake box spot. Wanna make use of it. The intake sitting there huffing the world’s hottest air seems like a waste of space. Also seen some cowl intakes but I’d rather not compromise the seal between the firewall and interior of the already dwindling waterproofing.

Anyone here have any out there/weird intake builds?

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u/Existing-Box-7938 — 1 month ago

Lower transmission cooler line

Anyone here ever did just the line leading into the cooler? Pretty consistent but slow leak, but it’s only at the very beginning of the lower cooling line.

Any ideas on if I should replace the entire line or just the connector?

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u/Existing-Box-7938 — 1 month ago

Dome light

Anyone here replace their dome light with something else? Mine is all cracked and brittle. Replacements cost too much, was wondering, maybe salvage MOBO and wiring and retrofit like an LED panel light maybe?

Anyone done that before? If so any tips?

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u/Existing-Box-7938 — 2 months ago

Passenger area measurements

Hi guys, my stupid self completely forgot to copy the template of the OEM carpet that I so happily cut out. It real bad due to a leak and probably unhealthy mold, breathing was hard when you were inside.

Anyone here know the square footage of the front passenger area? I was going to measure it but I can’t find my measuring tape it is down pouring outside. I was thinking getting an 80” x 108” carpet roll.

The rear I think I’ll be rhino lining and the front I will be redoing with carpet. I know ACC makes a pre-molded version you need to cut in yourself to get the perfect fit but I want to be as cost efficient as possible for the sake of my wallet and the sanity of my wife 😂, and I also like learning new skills so upholstery seems fun now that I’ve done the headliner.

Thank you all in advance!

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u/Existing-Box-7938 — 2 months ago

I got new front brake pads and rotors. Entire ZJ steering upgrade, 4WD axle, and a lucky bonus OME steering damper that has 0 issues outside of being coated in a ton of dirt. Anyone have anything else in mind I should swap out and what tools I should aim for?

New bushings? Or should I opt for new control arms? Eventually wanting to lift it to 3” but gotta save a while before that happens. Ultimately wanting to go 2.5-3” lift with 31” tires as it’ll be a daily/beach/light off road.

Thanks in advance.

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u/Existing-Box-7938 — 2 months ago

Hi everyone, I’m looking for advice on cleaning a massive amount of oil and dirt buildup in my engine bay. Engine block is so coated that the corners are completely "filled in" with a thick sludge of grime.

The Situation: It’s a thick, "well-blended" mixture of oil and dirt covering everything. A pressure washer barely touched it, and I’m hesitant to spray too much near the electrical connectors. Brake cleaner is effective but expensive for this volume.

Question: How in the world should I clean every nook and cranny without taking the block out?

Might have to someday but as of now, I just need the bare minimum of cleanliness.

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u/Existing-Box-7938 — 2 months ago