L67 Rough Cold Start Issue
- vlad01
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Re: L67 Rough Cold Start Issue
They did, GM had an aluminium gasket but unfortunately they were never standard equipment here in Aus.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.
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Re: L67 Rough Cold Start Issue
Yup. I think GM came out with that fix for the L26/L32 which was the last evolution of the venerable V6 engines.
Re: L67 Rough Cold Start Issue
bit of an update
Gave the heads, LIM, and charger case a good degrease in prep to service and some mild porting.
I stripped out the passenger head where the suspect cylinder 3 was and oh my god, all 3 exhaust valves on that head were not sealing on seat correctly. Cylinder 3 exhaust valve stem had 2-3mm of carbon scale built up on it where it passes through the port. 3 hours later its all cleaned up and back together with new stem seals and reground seats.
I have spotted what looks to be a crack between valve on cylinder 5 ... but that cylinder was no where near as dirty as cylinder 3
if i have time tomorrow ill tackle the drivers head
Gave the heads, LIM, and charger case a good degrease in prep to service and some mild porting.
I stripped out the passenger head where the suspect cylinder 3 was and oh my god, all 3 exhaust valves on that head were not sealing on seat correctly. Cylinder 3 exhaust valve stem had 2-3mm of carbon scale built up on it where it passes through the port. 3 hours later its all cleaned up and back together with new stem seals and reground seats.
I have spotted what looks to be a crack between valve on cylinder 5 ... but that cylinder was no where near as dirty as cylinder 3
if i have time tomorrow ill tackle the drivers head
Re: L67 Rough Cold Start Issue
IMO it is/was a mistake not having them properly crack checked!
But that's just my opinion ...
But that's just my opinion ...
Intelligence is in the details!
It is easier not to learn bad habits, then it is to break them!
If I was here to win a popularity contest, their would be no point, so I wouldn't be here!
It is easier not to learn bad habits, then it is to break them!
If I was here to win a popularity contest, their would be no point, so I wouldn't be here!
- vlad01
- Posts: 7801
- Joined: Mon Oct 08, 2012 6:41 pm
- cars: VP I S
VP I executive
VP II executive
VP II executive #2
VR II executive - Location: Kyneton, Vic
Re: L67 Rough Cold Start Issue
I agree, if there is any signs of cracks I would toss them and get good tested heads. Very common for the ecotec heads to crack due to stuff all material between the valves.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.
Re: L67 Rough Cold Start Issue
Thats a fair opinion mateGampy wrote:IMO it is/was a mistake not having them properly crack checked!
But that's just my opinion ...
I would love to find a set of uncracked heads. But the chances of that in NZ are slim and costly.
As I live out of town, walk to work, and have a daily driver for my partner, I'm happy to just experiment with the car in my spare time
Im not chasing huge power.
Previous to my ownership this L67 spent 2 years in a road legal skid pig eating intersections on a Friday night, so to have an issue like i have after a year of my spirited driving on top, I'm happy to take the chance for now and see how it goes
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- Posts: 3426
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Re: L67 Rough Cold Start Issue
Indeed. The guy that did my heads asked if I had any other V6 heads that weren't cracked and suggested I hold onto any I come across as they are becoming rare.
Re: L67 Rough Cold Start Issue
bit of an update here
shes all back together and running well no more issues cold starting etc
HOWEVER i think my wiring to the DFI is failing
the car stalls out randomly driving or idling etc.. a quick wiggle of the dfi wiring (up by the plug) and turn key to restart again
has anyone else come across this issue before?
shes all back together and running well no more issues cold starting etc
HOWEVER i think my wiring to the DFI is failing
the car stalls out randomly driving or idling etc.. a quick wiggle of the dfi wiring (up by the plug) and turn key to restart again
has anyone else come across this issue before?
Re: L67 Rough Cold Start Issue
Yes, having done decades of road side assist work, the DFI pins loose tension with age. In my experience VT/VX where the worst.
According to chemistry, alcohol is a solution...