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Vx N/A V6 Ecotec Rough Engine Diagnosis

Gw33dz

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Yeah i used new bolts torqued to spec in sequence. It started running rough after a cold start, that's why I started replacing stuff/ head gasket.

It had an exhaust manifold leak on both sides (snapped stud each side), i replaced the studs, used manifold gaskets and maniseal, but the left header has a crack in it, and the flanges are leaking because i couldn't tighten them up properly, will get a long shank socket to nip them up today. Maybe it is O2 sensor related. Hope so that would be an easy fix.
 

Not_An_Abba_Fan

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Did it make that noise as well before you pulled it apart?

I'd be checking that the rockers are seated correctly on the push rods.
 

Gw33dz

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Did it make that noise as well before you pulled it apart?

I'd be checking that the rockers are seated correctly on the push rods.
Yeah, i don't think it was as loud a tick, but it was rough, like a couple cylinders weren't firing.

Today, i squirted a bit of throttle body cleaner down the pushrods.

Then i ran the motor up to operating temp and it smoothed out a lot, recorded some vid, excuse the weird vertical orientation, stupid phone did it, but you get the gist.

Be interested to see what you guys make of it.

 

Not_An_Abba_Fan

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Probably gummed up lifters.
 

Gw33dz

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Thanks for all the help. I've got some lifters and pushrods on order, will let you know how it goes.
 

Gw33dz

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Replaced lifters, push-rods and rocker arm bolts, now she's purring.

Thanks for all the help.
 
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