Outlaw Star

I'd look at your bearings first.

98 brutus

I have a k&n cold air intake....
Its tight because she sucks in alot of air sounds like a whistle lol but if u plan of water crossings its a no go... I need my snorkel but to cheap to buy the kit

dukie564

Synthetic is a completely different animal than dino. This is a good combination

dukie564

There is a sensor called the Crankshaft Position Sensor that controls the spark timing for the engine. It's very common for these to fail on these trucks, and when they do it results in a no spark, no fuel condition. This is most likely where the problem lies.

Symptoms-
- Starter cranks and cranks but engine won't start up
- Fuel gauge and voltage gauges may not work or display properly.
- You sometimes will have No Bus on the odometer after 30-60 seconds.
- A failed CPS/CKP may or may not throw a CEL trouble code.
- No spark at the spark plugs.
- Fuel pump should run and prime for 3-5 seconds.

If the CPS/CKP is failed sometimes the OBD-II code reader cannot make a connection to the computer or cannot read Check Engine Light/MIL codes because the CPS/CKP has failed.


Diagnostic steps to confirm the CPS is the cause of your no-start


You should be able to verify a bad cps, by unplugging it, and turning the ignition key to on. If the voltage gauge and/or the fuel gauge now displays correctly, replace the CPS.

Unplugging and reconnecting the CPS sensor where it connect to the main harness near the back of the intake manifold usually resets the ECU and if the jeep fires right up after doing this you can bet that the CPS is faulty and needs to be replaced.

Exchange the fuel pump relay and the ASD relay with one of the other similar ones in the PDC to eliminate the relays as the cause of the no-start Confirm that the fuel pump to runs for 3-5 seconds when you turn the ignition key to ON.

Eliminate the NSS as a cause of no start. Wiggle the shift lever at the same time you try to start. Put the transmission in Neutral and do the same. Do the reverse lights come on when the shifter is in Reverse?

Inspect the wires and wire connectors at the O2 sensors on the exhausts pipe. A short circuit from melted insulation or from broken O2 sensor wires can blow a fuse and the ECU/ECM will loose communication.

Begin with basic trouble shooting of the start and charge systems. Remove, clean, and firmly reconnect all the wires and cables to the battery, starter, and alternator. Look for corroded or damaged cables and replace as needed. Do the same for the grounding wires from the battery and engine to the Cherokee's frame/body. Jeeps do not tolerate low voltage or poor grounds and the ECM/ECU will behave oddly until you remedy this.

CPS Testing

Crankshaft Position Sensor Connector



TESTING PROCEDURE 1991 – 2001 4.0L H.O. engines
1. Near the rear of intake manifold, disconnect sensor pigtail harness connector from main wiring harness.
2. Place an ohmmeter across terminals B and C (SEE Image). Ohmmeter should be set to 1K-to-1OK scale for this test.
3. The meter reading should be open (infinite resistance). Replace sensor if a low resistance is indicated.



If the CPS is bad, here's how to change it:
http://greatlakesxj.activeboard.com/...picID=24211453

PCM should be the absolute last item you change - they very rarely go bad.

dukie564

I have a generic one off ebay (Chrome Intakes i think?) that I run in the winter time when I take my cowl snorkel off. I like it - sounds good and plenty of power, plus the ability to clean the filter. I do not recommend running one unless you go through the trouble of building a heat shield around it, or if you do not take it offroad through water at all.

dasbugin

2 questions does anyone know a way to test if my gas cap is throwing my check engin light.. i looked up the code its deffinatly a gas cap or vaccume line cause its telling me its an evap leak

Second does anyone know some good / or cheap snorkles ?

dukie564

1) No way to test it - just make sure it's tight (3 clicks), and reset the computer (touch battery terminals together for 10 seconds). If it comes back on, replace the cap (OEM cap - not a cheap parts store cap)

2) A full snorkel? I have a cowl snorkel that works great, and is suitable for 99% of water crossings - cost me $15 to make. Unless you're getting REALLY deep it should be more than enough.
https://www.cherokeeforum.com/f67/my...snorkle-67919/

Outlaw Star

Anyone use the RC control arm drop brackets? I don't like tubular style arms and have reinforced my stock ones like we do on cars.

dukie564

Haven't used them, but I like RRO's design a bit better
http://www.rocky-road.com/xjcad.html

98 brutus

Anyone know where I can get RC LCA bushings at?

flosho

Do you mean the pinion bearings or the wheel bearings or which ones?

Outlaw Star

I'd check them both. There's no telling what maintenance was and wasn't done before you took ownership.

sycoglitch

im not sure if this was answered, havent used computer to check forum in a while usually on ipod, BUT go in the engine compartment right behind your cluster and check that ground wire. make sure shes clean looken. take her off sand it down and the body where it connects and see what happens. also check the battery terminals too that they are clean

BRN2KL

I back what dukie said. Had a YJ that I wanted to push into a lake because I couldn't get it to start. Replaced the CPS and it ran like a champ. CPS is at about 11 o'clock on the bell housing, should be less than $20 at the parts warehouse.

BRN2KL

Whoa, one at a time please! Seriously though, the problems with your gauges are just that, problem with your gauges, or the wiring going to them. Start trouble shooting those and u will probably found corroded wires, bad grounds, or bad sending units.

If ur wife is just impatient when u work on your jeep, my question is does she have a sister? Moving on, run the compression check again, if u still get whacky numbers, u got problems. Possible head gasket, or bad rings and egg shaped cylinders in the block. Do u know the maintenance history of the motor? How many miles on the clock? Dukie has a quarter million on his clock and has no problems, not everyone is that lucky. Probability is high that u are do for a motor overhaul and rebuild.

Stumbling through acceleration may also be explained away be the comp numbers u were getting. If u get a chance, look at the injectors make sure they don't look like a sewer pipe. If they do, search for injector swap on this forum and there is a load of info on that subject.

As far as the gaskets; valve cover, intake, exhaust, and head gasket obviously. May be one or two minor ones but the whiskey is distorting my memory. Hope this helps. Good luck.