sycoglitch

Welcome. This is an easy fix for you. Ditch the spacer. It doesn't do much for the 4.0 engine. Helps with higher rpm apparently but nothing that you'll be usually using normally. Some people also have made comments about losing some low end torque which is what the 4.0 does great.

Dny13

Thanks.
I will take that into consideration.

cruiser54

Keeping that spacer and dealing with the results of having it is alike to letting someone give you a bad case of the flu.

Dny13

Also need some advice on cooling.
I have removed the thermostat on my 4.0 cherokee as a friend said it would help during hot summer days.
Don't know if that was good for the engine, as the gauge would go past 100 mark sometimes all the way to the red mark and stay there for long, but water doesn't boil or anything
I'm sure the gauge is working fine.
Could it be just the sensor playing up?
I've been driving uphill one day, was really hot and There were other guys with Grand Cherokees 4.0 with the thermostat on and as soon as they switched the engine off the water started to boil. My one was ok.
P.s cooling sistem is stock.
Should I leave it as it is?

XJwonders

always leave the 195 thermostat in the engine. With it removed, the engine ll never be put in the warm mode and it ll continuously dump the excessive fuel.

Maxhennen64

okay, i have been battling this misfire for about 2 months now. and im just ready to kill myself at this point. i have replaced the following: crank position sensor, cam position sensor, spark plugs, wires, swapped one and 2 injectors, code didnt follow, ignition coil, cap, rotor, ran marvels mystery oil. and today i plan on replacing the throttle postition sensor.

other then that anyone have any ideas. i know things like cracked flex plate may cause it, but i am just out of ideas, fuel pressure is good, dont beleive ive had a loss in compression last time i checked. but i hope its not a bent or cracked valve.

any input would be helpful. thanks
99' xj 160k miles

salad

What did the spark plug from #1 cylinder look like?

It's time to run a compression test, both wet and dry.

Maxhennen64

if i remember correctly it looked okay, like the others, that was a while ago but i wouldve remebered if it had oil, or coolant residue for sure. but im going to replace that tonight as well, and yea i guess a leak down and compression test is next, but do you think it could be anything else bseides the testing? and thanks for the input!

salad

Well you pretty much eliminated everything else!

Maxhennen64

yea im hoping its my tps. i read that that can occasianally cause a misfire. im skeptical but i mean hey may as well try. but will do some leak down and compression testing tonight. at this point i hope it is just a bent valve, and i can replace that easy. but hope the bottom end is okay

Juno

I just checked my dipstick. It doesn't look contaminated right? I'm thinking about buying a Clearwater or Promaxx/Alabama Cylinder Head, any opinions on it? What are the chances of the engine internals being damaged at this point? Guys at Jeep King suggested that I look for a used engine, but I don't want to run into the same problem again later down the road since it'll be the same head.

salad

Don't waste your money on a TPS. Consistently throwing a code on a single cylinder is too specific. Test first!

Can't tell from those pics, the dipstick just kinda looks oily to me. You're going to have to pull the drain plug.

If you're losing coolant and have low oil pressure, you have internal damage. That's why the pressure is low.

As far as a used engine, that depends entirely on what you swap in. Obviously a 2000-2002 with a 0331 head wouldn't be a good idea, lol. You can use any 4.0L from an MJ, XJ, or YJ, or even early year TJ (1999 and earlier) without effort. The one catch is that the 2000+ heads have different sized exhaust ports, so you can buy an adapter to fit your original manifold, find a new head, or find a used 0331 head with the TUPY foundry mark (revised non-**** version)

rockosocko

History: Got a '96 Cherokee (2wd, 4cyl, 2dr, 5spd) that I want to make MY version of "RaceJeep".
It's a 8.25 rear and looked for tags. Saw 2 small ones. Tiny enough that I thought that they may have been cut, but nope.
One said 4.1 so I knew was a 4.10. BUT, it's the other tag that shows 1206..
These tags are only about 3/8" long (past the bolt head)

I've done the searches here and googling it but it's gotten to be a waste of my time for what I'm looking for.
I know about the gear ratio's, and that's what is pretty important to most.
(I was hoping to see if I could find out if it was a 29 spline or 27 by the other numbers, and it's a 27)

So, would anyone know what those other numbers are for or mean?

Thanks E

Deltatech

Does anyone know if there is a speaker connector under the carpet or under the dash for the left door (drivers side,North America) and left rear speakers?
I checked and both of my speakers are good but the wires are either shorted or disconnected.
I'd hate to have to run new wires if the stock can be fixed...

NewKindOfClown

The wires commonly wear through in the rubber door accordion