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07 Buick Lacrosse V6 2.8L


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neskid
New User

Mar 7, 2020, 1:55 PM

Post #1 of 8 (731 views)
07 Buick Lacrosse V6 2.8L Sign In

Was experiencing overheating issues and avoided operating the vehicle until I replaced the thermostat. Took it out for a drive and everything was looking good until a spike in heat after about 10 highway miles. Parked the vehicle and let the car cool off for a few hours. Tried to make the trip back home but immediately overheated so bad the car stalled out.

Had the vehicle towed and a few days later watched the vehicle at idle and no overheating but some high temps. Was getting some white smoke off the bay by the firewall at the back of the engine so chalked it up to a bad head gasket.

Removed the intake, exhaust, and both heads with no definite sign of gasket failure. Found a lot of oil in the upper intake manifold and oil in 2 of the cylinders. Need to inspect the heads for warpage but wondering if the heads may be fine and the issues could be due to intake and/or intake gasket failure?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 7, 2020, 4:07 PM

Post #2 of 8 (726 views)
Re: 07 Buick Lacrosse V6 2.8L Sign In


Quote
Was getting some white smoke off the bay by the firewall at the back of the engine so chalked it up to a bad head gasket.


That makes no sense at all.
If you saw steam at the back of the engine, that would be the coolant leak that triggered all of this, not a head gasket. Head gaskets leak into the combustion chamber, not on the ground. Tearing this engine down made no sense at all.
Put it all back together and pressure test the cooling system to locate and repair the leak.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



neskid
New User

Mar 7, 2020, 4:22 PM

Post #3 of 8 (722 views)
Re: 07 Buick Lacrosse V6 2.8L Sign In

Any help what would cause the oil leak into some of the combustion chambers and into the intake manifold?

I also noticed after idle test I had oil leaking down the from the head/valve covers.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 7, 2020, 4:26 PM

Post #4 of 8 (718 views)
Re: 07 Buick Lacrosse V6 2.8L Sign In

Since there is no such engine as a 2.8 in that vehicle, I have no idea what you are dealing with.

The choices are 3.6 and 3.8.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



neskid
New User

Mar 7, 2020, 4:43 PM

Post #5 of 8 (714 views)
Re: 07 Buick Lacrosse V6 2.8L Sign In

Sorry I meant 3.8L


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 7, 2020, 4:54 PM

Post #6 of 8 (705 views)
Re: 07 Buick Lacrosse V6 2.8L Sign In

It's hard to tell you anything without seeing the situation myself. If the valve covers are leaking, that's no mystery, replace the gaskets.
If there is oil in the upper intake, that tends to point to excessive compression blowby or a bad PCV system but again, I'm not there to see the situation.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



neskid
New User

Mar 30, 2020, 5:14 PM

Post #7 of 8 (485 views)
Re: 07 Buick Lacrosse V6 2.8L Sign In

Ok well after replacing all gaskets from the head up and getting everything back together the car runs but after about a minute I got smoke off the right side yet again. Any suggestions?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 30, 2020, 5:21 PM

Post #8 of 8 (480 views)
Re: 07 Buick Lacrosse V6 2.8L Sign In

If you are still getting smoke in the front of the car, then you still have a leak somewhere.
Could be engine oil, could be coolant, could be trans fluid.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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