BAD idea.

 

Thanks 😄

 

I understand that gas mileage will suffer if it does not reach operating temperature.

 

Emission controls wont work right at low coolant temps either. Seems like the common 192 or 195 temp is where it's supposed to be in order to work...

 

Once you get that fixed make sure you take your Jeep to Krown or Rust Check. The rockers and frame rails rot out from the inside as they are not sealed. The are structural, and oil-based undercoat that is sprayed around in there is the only way to curb that stuff. I've got to replace everything below the doors on my Ontario-driven 1999 because the owner just "washed it".

The WORST? Fuel economy suffers, heater sucks, emissions go up due to high CO and HC, PCM throws P0128. Most of those won't happen in the summer though as the cooling fan won't know the difference and it will continue to regulate as normal.

 

Any specific stuff to spray into my frame rails for the winter for rust protection? Just some aerosol oil? Some of it is undercoated to protect it, but that's mainly the rockers.

Also anything specific for mag chloride? that's huge here over salt.

 

Update after more troubleshooting the blower motor...

Blower motor operating only on "number 4" setting in 2000 XJ. I believe I've troubleshot the problem to the blower motor.

1. Replaced Blower Motor Resistor - no change
2. Tried system without BMR - no change
3. Verified ohms across Blower Motor Resistor - new same as old
4. Verified 12V present at correct wires going into BMR when switch changed (switch is good)
5. Jumped wires on resistor plug (so 12v would pass through at any setting - blower worked... confirms circuit complete)

So, the blower motor only works with 12V present. Why would it work great at 12V, but not at all at a lower volt? Is there something I'm missing?

 

With winter coming up, you have time (rust doesn't spread as fast in the cold) A good little project for the spring maybe!

 

Umm cold= snow,
Snow = salted roads
Salted roads= rust!
Thought rust is worst in cold?

 

That's conditional. Road salt causes rust to spread exponentially faster. The worst thing you can do is get salt on your car and then park it in a heated garage.

 

ok i need help i have a 242 transfer case and i was wondering whats the difference between the 242 and 231 i want to do a sye kit and how hard and would i need to change any thing to change from a 242 to a 231

 

When you figure it out, let me know. Mine works on 2 and 4 not on 1 and 3.

 

I have a 99 limited, 3.5 Rough Country on 31s.


On my way home it started to give me sluggish acceleration and then died. If I give it gas, it will start up again and the motor runs at high rpms but when I stop it dies. The next second it idles fine but then dies again. When it starts to struggle the speedometer jumps really high for a second. Any thoughts?

 

Shop around for a product called Krown. Especially if you wheeling through water. Unlike old-timer redneck solution of spraying used motor oil it's the least toxic thing you can spray and it's thick and clingy. You want to get this stuff inside the frame rails and inside the rockers in addition to visible areas. Oh I guess above the gas tank too.

This. Rust doesn't happen in the cold, the brine has to be warm. As soon as spring hits all that salt suddenly leaps into action.

NP242 has these modes:
2WD
4WD Part Time
4WD Full Time
Neutral
4WD Low Range

NP231 has these modes:
2WD
4WD Part Time
Neutral
4WD Low Range

For the part time ranges (including low), the transfer cases lock the front and rear driveshafts together. This makes use on hard surfaces basically impossible. The full-time option of an NP242 uses a small differential gearset (like your axle) to deliver power, so can be used on pavement.

Because of this the internals are significantly different. NP231 SYEs consist of a new main shaft and some other goodies. NP242 however must use a Hack-n-Tap style where the existing shaft is shortened and a new fixed 1310 yoke is bolted on in place of that slip yoke BS.

Try checking out the Modified Tech forum. Or pop over to Google and search CherokeeForum, it'll give you a little box that you can use to search this site.

Yep. Don't care what your lift is but do care what your engine is :P

Have you scanned it for codes? When was the last tuneup?

 

Yeah I know salt causes rust. Cold air doesn't.