Hello everyone, this is my first post on this forum, so hi.

I recently bought a 2002 Excursion limited v10. It's got a couple of issue, mostly small stuff. The biggest is that it recently developed a pretty bad misfire. The code I'm getting is p0359 which is for the coil on cylinder 9. So I changed that and I'm still getting the same code. I took it to the shop and they're saying that they are not getting a signal on the wiring harness for cylinder 9 and they think that it needs a computer. They want to check all the wiring first to eliminate the possibility of a short or bad connection. My question is, if the coil somehow shorts out against the block, can that burn out the computer?

Thanks

 

Do not jump to that conclusion

Check the plug the boot and then the wiring back to the ecu then you you can go after it if all that checks, the misfires with these engines are prone to the boots plug coil end

 

very common for the wire just before the connector to break.

 

A boot or spring cannot cause a P035x code. It's an electrical circuit fault (open/short) on the primary side of the coil which includes the PCM, the wiring harness, the COP and its connector, and the power supply circuit.

That will DEFINITELY cause it.

 

I already replaced the coil for that cylinder and all the plugs. The shop says that they are not getting a signal on the wiring harness at that cylinder only.

They said they are going to check all the wiring back to the pcm to rule it out first so I guess they are on the right track. What does it take to burn out the pcm? Will a simple short to ground at the wiring harness at the coil do it or does it take more then that?

 

Good call I didn't pay attention to the code stated

 

Have them carry on, they are on the correct track.

 

That's exactly what it was. However now I'm back to square one with an occasional miss every 5 seconds or so and no CEL.....I guess I have to swap coils one at a time. I already put in new plugs.

 

No, you don't. Look at your mode $06 data for the individual cylinder misfire counts. TID $53.

 

True but then it would need to spend another day in the shop. Are there any cheap computers that can read mode $06 data?

 

And how long would you spend playing round-robin with new coils?

Android phone/tablet, a BT OBDII adapter, and the Torque app. If you already have the phone or tablet, the rest is under $30.

 

I ordered the BAFX bluetooth scan tool from amazon for $24. Anyone have experience with this one? Also, I noticed that the Autel handhelds don't read my Ex, I tried 2 different ones. They just hang at the loading screen. The Actron and Snap-on scan tools work perfectly fine though. Anyone else notice this?

 

Update?
,,,,,

 

I'm trying to pull up the mode $06 data but it doesn't seem to work with the obd II scanner I got. I tried using it with torque pro and another app, I forgot which. All I was able to find was a pending code p0174 which is for lean fuel mixture bank 2. Anyone know which cheap scan tool can read mode $06? The truth is, the missing really isn't that bad. It happens a few times a day and when it does it'll do it a few times within a half minute and then it miss again for an hour. I may just leave it.

 

I use dashcommand for android on my tablet. I have used multiple cheapo Bluetooth adapters and they work fine. With dashcommand you have to buy the extended pids to get misfire data. Worth every penny.