2005 QC Misfires????

[VIPR PWR]

3. What’s A Crankshaft Sensor?​

The crankshaft sensor (or crank sensor) detects the exact position and measures the rotational speed (RPM) of the engine crankshaft.

The powertrain control module (PCM) reads this data to determine when to generate a spark and in which engine cylinder. The crankshaft’s position also tells the PCM if there’s a cylinder misfire.

If the crank sensor signal is missing, there won’t be any spark or fuel injector operation.

 

[VIPR PWR]

The 0351 relates to #1 cylnder

 

[VIPR PWR]

What coil packs did you use for replacement .. Just because something is new doesnt mean its good !

 

[VIPR PWR]

Sound like you jumped into the heavey work at the start ... coil packs and plug wires routed under the intake manifold makes for a pain in the ass !
Then directly to the PCM ? Funny they didnt say what was wrong with it .. I would be raising hell .. Usually not cheap !

I had a misfire a few years ago on a long road trip ,, even sounded like a very light tappet noise ... cant remember the code from back then .. But turned out to be the back plug #10 cyl. on the passenger side . Codes can be deceptive and lead you to the wrong parts ..the codes led me to the #1 cylinder .. replced the plug and problem solved for a couple dollars ..

Just remembered when the bad plug thru the code it did throw several codes for misfire showing several different cylinders .. but replacing the #10 fixed the problem .. I did replace all plugs after that ..

 

[Wifey]

Sounds like returning the PCM is the best bet at this point! Geeez what a hassle to go through! Hoping a different PCM corrects the frustrating issue

 

[Drogi77]

Hello yall, I bought a 2005 QC with 73k miles recently. It was a deal that was too good to pass up on, but some things are too good to be true.

Anyways, Has a code p0351. I was hoping it was a simple coil pack replacement, but that didn't do the trick.

Had someone check the computer and they said that it needed to be fixed.

Sent the PCM to The Viper store and he checked it out and said yes it needed repair. He didn't quit tell me what was wrong with it. But..

Reinstalled computer in truck and it didnt fix the problem.

So i did a deeper dive into the harness etc... and there is no ground signal from the PCM on cylinder 6 and 1. Both have 12 volts but will not pulse. I checked continuity from the pcm injector pin to the injector on 6 and 1 and they check out OK.
I've checked the ground from the motor to the body and the body to the battery and there OK too. Checked to make sure the computer is grounding.

I'm currently changing out the camshaft sensor to eliminate that being an issue.

Does anybody have any idea why there is no signal from the PCM on 2 cylinders? Or is it still the PCM?

Thank you in advance.

I had the same problem with my 05 QC. I followed the harness that runs through the back of engine and 2 wires were rubbing against engine block.