Injector misfires?!?!

[gamudslinger88]

HELP NEEDED

Ok guys need some help here, placed the truck up for sale and I guess she got upset with me. I pulled it off the market until I sort this out. Last night on the way home I had an injector misfire when passing someone. Then it happened at lower and lower rpms. Eventually it got to the point I had to limp it the rest of the way. Threw code p0301, injector misfire on #1. Had this issue a little while back and found a shorted wire. Searched the harness over and found nothing. I ice picked the connector thinking maybe that's the issue. Took it for a spin a second ago and it's worse with codes p0300 injector misfire detected, p0301 injector misfire on 1, p0302 misfire on 2. Any help in which direction would be greatly appreciated.

06 lbz, 100% overs, dual stock lbz pumps, Danville tunes,

Symptoms are crappie idle, fuel knock, no smoke or haze and the obvious misfire. Maybe crank or cam position sensor? I was thinking injector failure but now it's moved to another injector I am thinking electrical issue. Ohh and replaced the o ring and gasket and hold down bolt on the #3 injector, symptoms started the following day.

 

[duramaxzak]

Broken crank?! I have heard of symptoms like this when a crank broke.

 

[IOWA LLY]

Pull the crank position sensor out and see if the reluctor wheel has made contact with it on the end.

Like Zak said, sounds like a broken crank.

Sent from my SM-N920V using Tapatalk

 

[Harbin_22]

Exactly what mine did with a broke crank. No noise, very faint vibration and miss fire codes.

 

[gamudslinger88]

I'll check it out. I checked the volts on my batteries and they were low. I'm headed to get new ones so I'm hoping that's all it is. Alot cheaper and easier than a broken crank.

 

[gamudslinger88]

It does have a very distinct knock like a fuel knock but it's hard to tell. Does sound like it's coming lower than the injector.

 

[gamudslinger88]

Damper is wobbling so the crank is broken.

 

[Harbin_22]

Take the belt off and try to wiggle the balancer. Mine wasn't broke all the way at first, but the more I messed with it the worst it got

 

[gamudslinger88]

It wobbles pretty bad. The tensioner pulley bounces about half an inch. The more I let it run and the more I drove it last night the worse was getting as well.

 

[rmallen30]

damn that sucks bad.

 

[gamudslinger88]

I think I'm just going to list it again for sale as is with broken crank.

 

[JeremyDon88]

Man I hate to hear that!! Do u think it broke when u got on it to pass?

 

[gamudslinger88]

I don't think so. I remember it misfiring the morning before when I pulled out it traffic on my way to work, i was at most quarter throttle. Did it only once though. Maybe that's when it happened. Even passing I wasn't in it hard at all, it it 3k rpm and acted like it was hitting a Rev limiter hard. Did it again at 2600. Then again at different times intermittently. Then this morning I could barely pull out of the drive.