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Discussion Starter #1
New to forum. Thanks for any input.
94 xj sport
4 door
4.0 liter
I just put new tires on yesterday. 235/75r15 snow tires.
Drove to friends about 100 km. No problems. After visit, I warmed up vehicle before leaving. Check engine light came on. It does this sometimes when idling for a while. I shut it off and restart and it stays off for rest of drive. Has done this for years. This time check light did not shut off after restart. I drive about 50 km and suddenly tach, speedo, volt meter, radio, lights and turn signals quit. Gas and temp and oil gauges still working. Normal power. I pull over and idle a second and she starts to stall. Give a touch of gas, barely keeps running. Suddenly everything is operational again but when I hit the gas the belt squeals (maybe from the almost stall). I drive the remaining 50 kms home, engine light still on but no problems. Belt squealed a bit under hard power at first but then no squeal. When I get home, I shut it off. Restart and no engine light. No squeal.
Could the vehicle speed sensor vs new tire size be the issue? Strange it happened a day after new tires and then a drive on the highway.
Thanks for any thoughts.
 

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tires have nothing to do with it. Do the key on, off, on, off on trick and watch the flashes to get any trouble codes
 
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Discussion Starter #3
tires have nothing to do with it. Do the key on, off, on, off on trick and watch the flashes to get any trouble codes
Thank you. Before posting I had read somewhere else that tire size could be a cause of vss error. I'm eliminating that from any troubleshooting seeing as it really makes no sense.
Trouble codes are:
12 - Battery disconnected within last 50 cycles.
11 - No distributor reference signal during engine cranking. Check circuit between distributor and PCM.
41 - Problem with the charging system.
21 - Problem with oxygen sensor signal circuit. Sensor voltage not fluctuating.

As Gluckmysock was saying, I will check all my grounds and connections to start. According to trouble codes it appears I need to check my charging system and likely replace o2 sensor. Also possibly the circuit between distributor and the PCM. Assuming I've interpreted that correctly.
Thanks again!
 

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I think too you should test for spark. That is easy, pull the coil wire from the distributor and put a phillips screw driver in the boot and hold close to metal while cranking. If you don't get spark, then you can go from there
 
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I think too you should test for spark. That is easy, pull the coil wire from the distributor and put a phillips screw driver in the boot and hold close to metal while cranking. If you don't get spark, then you can go from there
Will do that too. Thank you good sir!
 

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Yep. So far so good. There is a cam shaft position sensor under the distributor cap. Check this connection. And it's possible this sensor is bad. It actually tells the ECM when to fire the injector.
Charging system could be corroded connections or the alternator could be on its way out.
Trace the o2 sensor wiring, make sure it isn't touching the exhaust and melted. Also check the connectors. It doesn't hurt to unplug them, spray with electrical contact cleaner and reassemble. Try to refrain from using brake cleaner for this, it's harsh and could damage the plastic connector.
The battery code is self explanatory.
And for future reference. Anytime you replace a sensor controlled by the ECM, it's wise to disconnect the battery terminals from the battery, touch them together for 10 seconds. ( you can pull the headlights on and off during this if you want) then reinstall the battery terminals. This process will reset the ECM to factory defaults and relearn all the sensors. It will run like crap for a bit but will clear up.
 

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Discussion Starter #7
Yep. So far so good. There is a cam shaft position sensor under the distributor cap. Check this connection. And it's possible this sensor is bad. It actually tells the ECM when to fire the injector.
Charging system could be corroded connections or the alternator could be on its way out.
Trace the o2 sensor wiring, make sure it isn't touching the exhaust and melted. Also check the connectors. It doesn't hurt to unplug them, spray with electrical contact cleaner and reassemble. Try to refrain from using brake cleaner for this, it's harsh and could damage the plastic connector.
The battery code is self explanatory.
And for future reference. Anytime you replace a sensor controlled by the ECM, it's wise to disconnect the battery terminals from the battery, touch them together for 10 seconds. ( you can pull the headlights on and off during this if you want) then reinstall the battery terminals. This process will reset the ECM to factory defaults and relearn all the sensors. It will run like crap for a bit but will clear up.
Excellent advice and suggestions. Thanks to you both for the guidance. I will follow it and update with results here. Much appreciated!
 
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