No spark, No gas, No bus Message after engine Washing, HELP -
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post #1 of 3 Old 12-24-2012, 10:57 PM Thread Starter
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1999 XJ Cherokee 
Join Date: Dec 2012
Location: COVINA
Posts: 3
No spark, No gas, No bus Message after engine Washing, HELP

Yesterday I washed the engine of my 99´ XJ, after that I start the engine it cranked right up and put it out on the street. After a min. it quit. I tried to start it again and won´t turn over. It cranks but no start. I tried several times to turn it on again and it started but after a few seconds the engine stopped and I couldn´t turn it on again.

Have no spark, fuel pump doesn´t work, No bus message on the cluster.

Thing´s I´ve done:

Patience at this moment 100%
-Check all fuses. All fuses Ok.
-Changed the Crankshaft Position Sensor.
Patience level now
-Changed my coil for an MSD coil.
Patience level
-I cleaned with WD40 all the spark plugs cables.
-I take off the distributor cap and clean it very well.
-Take off main sensor´s and spray WD40
Patience level
-Take off computer conectors and clean them very well with WD40.
-Tried to start it and appears on the Dash "No bus".
Patience level

What should I do now?

Last edited by KommanderCool; 12-24-2012 at 11:12 PM.
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post #2 of 3 Old 12-25-2012, 01:33 AM
Real Jeeps have dents
CJ7-Tim's Avatar
2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis
Posts: 25,782
Use some conditioner ?

You are on the right track suspecting that water has gotten into a wire connector or engine sensor. A NoBus and the no-start symptoms suggest the Crankshaft Position Sensor, the Camshaft Pickup Sensor (inside the distributor), or the engine computer. I would also remove and check all the relays in the under hood fuse box.


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post #3 of 3 Old 12-25-2012, 05:19 AM
It's the crank sensor!
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1999 XJ Cherokee 
Join Date: Nov 2007
Location: Central Minnesota
Posts: 8,850
Therein lies the danger of washing the engine..............

The crank sensor is a very common cause for the NO BUS, but theoretically, anything along the "bus" can give you this problem.

So other suspects would be any of the 5 volt engine management sensors AND the computer itself. And the power distribution center (black box); check that for water intrusion as well.

Try one by one, unplugging the sensors and then looking to see if the NO BUS message has gone away with that sensor unplugged. If you find the message is gone with any particular sensor out of circuit, you have found your culprit; replace that sensor.

If the above technique with the sensors doesn't find the problem, I think I'd consider getting a salvage yard computer.

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
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bus , cps , ecu , spark , washing engine

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