Well that's new

Gasman1979 · Jul 23, 2024

Well. I unhooked the O2 and be damn the jeep ran like a top ! Got to the kennels to feed and water the rescue pups and when I went to leave…dead. Totally dead. Called the wife. She boosted me off. Now I’m getting a pegged out volt gauge and warning light of course. It ran freakin amazing tho! Got home, killed it and it’s dead again. Like hammer dead. I’m out on a rescue call now and can’t check anything till tomorrow but looks like I’m either buying a new battery or new alternator

JMT · Jul 23, 2024

Gasman1979 said:
Well. I unhooked the O2 and be damn the jeep ran like a top ! Got to the kennels to feed and water the rescue pups and when I went to leave…dead. Totally dead. Called the wife. She boosted me off. Now I’m getting a pegged out volt gauge and warning light of course. It ran freakin amazing tho! Got home, killed it and it’s dead again. Like hammer dead. I’m out on a rescue call now and can’t check anything till tomorrow but looks like I’m either buying a new battery or new alternator
View attachment 545139

That happens when everyone reaches 171,489 miles. Geez!

Modoc Guy · Jul 23, 2024

Gasman1979 said:
Well. I unhooked the O2 and be damn the jeep ran like a top ! Got to the kennels to feed and water the rescue pups and when I went to leave…dead. Totally dead. Called the wife. She boosted me off. Now I’m getting a pegged out volt gauge and warning light of course. It ran freakin amazing tho! Got home, killed it and it’s dead again. Like hammer dead. I’m out on a rescue call now and can’t check anything till tomorrow but looks like I’m either buying a new battery or new alternator
View attachment 545139

That’s weird! I wouldn’t think that unplugging the O2 sensors would do that!

Maybe it fried something in the CPU?

macleanflood · Jul 23, 2024

I think someone custom tuned the PCM. Removing the O2 as I suggested forced the Jeep to use default fuel tables.

At this point I'd most certainly be looking at the pins on the PCM connectors and delooming and inspecting every inch of that wiring harness.

-Mac

B1Toad · Jul 23, 2024

I've seen a sensor short internally and take down the vref on that branch but if I recall you said you checked vref earlier.

Gasman1979 · Jul 23, 2024

B1Toad said:
I've seen a sensor short internally and take down the vref on that branch but if I recall you said you checked vref earlier.

I did but with this schizophrenic ass jeep who knows what it is now.

Gasman1979 · Jul 23, 2024

macleanflood said:
I think someone custom tuned the PCM. Removing the O2 as I suggested forced the Jeep to use default fuel tables.

At this point I'd most certainly be looking at the pins on the PCM connectors and delooming and inspecting every inch of that wiring harness.

-Mac

Yeah. I think you may be right. And I Really ain’t looking forward to delooming all that shit looking for shorts.

Gasman1979 · Jul 23, 2024

Modoc Guy said:
That’s weird! I wouldn’t think that unplugging the O2 sensors would do that!

Maybe it fried something in the CPU?

I don’t think the two are related. Surly the hell not ???? I’ll be testing the battery and alternator tomorrow. I HOPE they are unrelated.

Gasman1979 · Jul 23, 2024

JMT said:
That happens when everyone reaches 171,489 miles. Geez!

Damnit ! I knew it !!!

hear · Jul 23, 2024

Gasman1979 said:
Yeah. I think you may be right. And I Really ain’t looking forward to delooming all that shit looking for shorts.

I find it therapeutic. And re-looming & taping is very satisfying.

JMT · Jul 23, 2024

hear said:
I find it therapeutic. And re-looming & taping is very satisfying.

Come over next weekend. I've got a case of Coors Light for you while you're looming.

Gasman1979 · Jul 23, 2024

hear said:
I find it therapeutic. And re-looming & taping is very satisfying.

lol. How far is prosper from Pine Bluff ? I’ll let you do it !

macleanflood · Jul 23, 2024

hear said:
I find it therapeutic. And re-looming & taping is very satisfying.

Says the guy who thinks rebuilding automatic transmissions is entertaining...

=)

-Mac

Gasman1979 · Jul 23, 2024

macleanflood said:
Says the guy who thinks rebuilding automatic transmissions is entertaining...

=)

-Mac

Ah. So he’s psychotic. Gotcha. Anyone who “enjoys” rebuilding an auto trans cannot be mentally stable

Gasman1979 · Jul 24, 2024

found a bad ground. All is right with the world.

hear · Jul 24, 2024

But your exhaust is still glowing, right?

macleanflood · Jul 24, 2024

Gasman1979 said:
found a bad ground. All is right with the world.

Which one? Pictures? How'd you find it?

Glad you fixed it!

-Mac

Zorba · Jul 24, 2024

Gasman1979 said:
found a bad ground. All is right with the world.

Not terribly surprised. When the circuit defies all logic and is operating contrary to the laws of physics, its a ground problem.

ColoJeep · Jul 24, 2024

Gasman1979 said:
found a bad ground. All is right with the world.

I'm sure we would all love to know exactly what you found . Good Work !

Gasman1979 · Jul 25, 2024

Sorry guys !! I should have been more specific. The ground point near the oil filter was loose and badly corroded. I took it off and cleaned it up. I then went on a ground hunt excursion. I found 8 total including the battery. The oil filter one was the offender but I figured a thorough cleaning of them all couldn’t hurt. My manifold isn’t glowing now with the O2 unplugged. I’m waiting on a new NKG O2 to come in through Oreilleys. When it gets here I will either make my own plug or get an aftermarket 4 wire plug and replace both ends. I think the bad plug fried the other sensor

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