Misfire on cylinder 6 after cam and lifter install

89Suburban · Nov 28, 2022

07yukon19 said:
Any real way of the testing the volm before hand?

Not that I know of. @iamdub

When I replaced mine it was misfiring and throwing codes and going into limp mode. I double checked all my wiring and stuff and everything looked fine. So I got pissed off and revved the hell out of it to 5 or 6 grand and all of a sudden it cleared up and was fine. So the only reason I could think of was that purged the air out of it to operate properly but I dunno. Just sharing my experience.

Geotrash · Nov 28, 2022

89Suburban said:
Not that I know of. @iamdub

When I replaced mine it was misfiring and throwing codes and going into limp mode. I double checked all my wiring and stuff and everything looked fine. So I got pissed off and revved the hell out of it to 5 or 6 grand and all of a sudden it cleared up and was fine. So the only reason I could think of was that purged the air out of it to operate properly but I dunno. Just sharing my experience.

The ol' Italian tuneup!

iamdub · Nov 28, 2022

I'd bet a bi-directional scanner, maybe even a Tech2, could activate the VLOM solenoids. It really does sound like a faulty VLOM. "Spent the extra money and got the Dorman"? Usually, when someone is trying to save money, they buy Dorman parts cuz they're cheaper than OE parts. Even still, new OE parts can be faulty out of box. Scanned for any codes? I'd guess a faulty VLOM or wiring. Maybe one got pulled out of the connector.

07yukon19 · Nov 28, 2022

Only code is p0300 I have a hood scanner will try to activate tonight to see if I here the valve close and open

07yukon19 · Nov 28, 2022

Hooked my scanner up cylinders 1,4,6 I would command the solenoid on it was a hit or miss with them clicking, cylinder 6 worked once, cylinder 7 would click every time

Geotrash · Nov 29, 2022

07yukon19 said:
Hooked my scanner up cylinders 1,4,6 I would command the solenoid on it was a hit or miss with them clicking, cylinder 6 worked once, cylinder 7 would click every time

I’d say you found your smoking gun. Nice job.

iamdub · Nov 29, 2022

07yukon19 said:
Hooked my scanner up cylinders 1,4,6 I would command the solenoid on it was a hit or miss with them clicking, cylinder 6 worked once, cylinder 7 would click every time

Double check the harness and connector. If it's definitely the VLOM, spend the extra, extra money and get an OEM part. At least you won't need to replace any gaskets!

Joseph Garcia · Nov 29, 2022

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

Foggy · Nov 29, 2022

Just wanted to add: the Dorman company has an "updated Vlom" ... it is
an improvement from the OE vlom and from their original replacement vlom.
It's prob the only one i'd use. (now other dorman stuff "can" suck)

iamdub · Nov 30, 2022

Foggy said:
Just wanted to add: the Dorman company has an "updated Vlom" ... it is
an improvement from the OE vlom and from their original replacement vlom.
It's prob the only one i'd use. (now other dorman stuff "can" suck)

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

Misfire on cylinder 6 after cam and lifter install

89Suburban

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