Hey guys, need a bit of help.


I tried searching but didn't know how to type in symptoms.

Edited: '01 XJ 4.0L


I was testing my injectors with a screwdriver near an exposed injector wire. The screw driver touched the injector then the exposed wire and *zap* *spark* followed by the engine shutting off. Now it just cranks with no signs of starting.


Did I blow the Crank Position Sensor?


Any help would be greatly appreciated.

 

Doesn't sound good...sounds like the computer may be fried.

 

I'm thinking most likely you just blew one of the larger fuses. Maybe the Engine Control or Ignition one. Check them all out. The small ones under the dash and the larger ones up in the engine compartment especially. The last 2 times my XJ cut off and just cranked a bare wire had shorted and blown the large green Engine Cntrl fuse

 

Great thanks!

 

Yup, fuse check first. ALWAYS. Especially with situations like this.

Keep us updated!

 

Thanks for your post.
We’re here to help but you must understand that all Jeeps are not the same.
In order for us to give you more accurate advice and help, we must know the following, along with detailed information as to the symptoms/problems etc:
Year
Model
Engine
Transmission

 

Oh geez. Sorry. Total Newb Post. It's a 2001 XJ. 4.0. Not sure of the transmission

 

Here's a pic of your Power Distribution Center. Note the fuse marked IGN RAIL COIL FUEL INJECTORS. Check to see if it is blown.

Also PCM and ASD. Check these as well.

Edit: The fuel injector driver in the PCM for that fuel injector you sparked may be smoked. These FI drivers are touchy and can be smoked even with a low impedance fuel injector.

 

Oh thanks! Might go check it out later. I'm a fair-weather, backyard mechanic. Windy and low 30s here.

Love this forum. Will keep you posted

 

Ok tested all the fuses in the distribution center. All good.

Tested connector B and C on the Crank Position Sensor. As I'm to understand it, it should be an infinity ohms reading but it's reading 140. Do I start by replacing that?

 

Why don't you check for spark first before replacing stuff you don't know is bad.

I'm not familiar with the 2001 setup, but why would you think you "blew" a CPS when you were messing with the fuel injectors? I'm not even sure how a CPS is "blow-able"?

 

Eerily reminds me of the Eskimo with the leaky power steering..........

 

air
spark
fuel
fuses
relays
sensors
ignition
This is a good map to follow for a no start.

 

Weird, I just linked that video for someone over on NAXJA just yesterday.

Wouldn't Spark and Ignition be the same thing? hehehe

 

Ignition is where your key goes