Misfire on cylinder 6 after cam and lifter install

[07yukon19]

Alright did compression 165, getting fuel, spark replace the volm again and still getting the same results check the connector doesn’t look burnt I’m kinda at a lost

 

[Dustin Jackson]

@07yukon19 To eliminate the VLOM being the culprit you could try installing a nonAFM VLOM and see what happens. I wonder if there is a wiring issue in the harness sending signal to the VLOM causing it to kill #6

 

[Geotrash]

Alright did compression 165, getting fuel, spark replace the volm again and still getting the same results check the connector doesn’t look burnt I’m kinda at a lost

Ugh...SO frustrating. The only other thing I can think of is the lifters themselves being bad or installed incorrectly somehow. It would be difficult but not impossible to install the AFM lifters in the trays oriented 180º out. But you would likely have noticed if that were the case because they would have been very hard to insert into the trays. They're keyed on one side.

 

[Foggy]

So, Dorman further improved on GM's improved VLOM?

YES they did. It's a new part #. I used one on a 2009 chevy 5.3 couple of months ago

 

[Fless]

Pretty sure the Dorman would have a lifetime guarantee. If you get to that point return it to the retailer and request a refund; use OE if possible.

 

[07yukon19]

I figured if the lifter was bad I would hear a tick or knocking, sounds great minus the misfire if you rev it up to around 2000 it does miss as bad.
A guy told me to buy 4.8 valley cover and turn the dod off would I have to change anything else to turn the dod off or if I would have to tune it

 

[Geotrash]

I figured if the lifter was bad I would hear a tick or knocking, sounds great minus the misfire if you rev it up to around 2000 it does miss as bad.
A guy told me to buy 4.8 valley cover and turn the dod off would I have to change anything else to turn the dod off or if I would have to tune it

You would need to have it tuned out.

Did you try the Italian tuneup approach that @89Suburban suggested?

 

[Dustin Jackson]

I figured if the lifter was bad I would hear a tick or knocking, sounds great minus the misfire if you rev it up to around 2000 it does miss as bad.
A guy told me to buy 4.8 valley cover and turn the dod off would I have to change anything else to turn the dod off or if I would have to tune it

@07yukon19 You can install the 4.8 valley cover and hang the AFM VLOM on the side keeping it plugged in and that will let the motor run like normal until you get the AFM tuned out permanently.

 

[iamdub]

I figured if the lifter was bad I would hear a tick or knocking, sounds great minus the misfire if you rev it up to around 2000 it does miss as bad.
A guy told me to buy 4.8 valley cover and turn the dod off would I have to change anything else to turn the dod off or if I would have to tune it

About $60: https://lt1swap.com/afm_delete.htm

 

[07yukon19]

You would need to have it tuned out.

Did you try the Italian tuneup approach that @89Suburban suggested?

That I did the misfire wasn’t as bad but thee ole Italian tune did not fix it

 

[Rocket Man]

Following

 

[stevedonato]

If you bought the parts on amazon they refund everything.

 

[InterceptorF]

So if you replaced the lifters and cam maybe its not those components? What about the injector or the intake manifold gaskets? I just fought a battle with cylinder 7 misfire on mine and it was a bad o-ring on the injector. See my post.

 

[Geotrash]

So if you replaced the lifters and cam maybe its not those components? What about the injector or the intake manifold gaskets? I just fought a battle with cylinder 7 misfire on mine and it was a bad o-ring on the injector. See my post.

Gotta read back up the thread. He's verified that the rocker arms aren't moving after startup when they should be, and that's what's generating the misfire.