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foreverfalcon40
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Originally Posted by cichlid_baby
I thought that in our OBS trucks, the vacuum line only went to 2 out of the 8 cylinders, thus making the seafoam pointless through the vacuum.
It's been recommended that the only way to fully treat our OBS is through the gas tank.
Can someone chime in to confirm this?
I just looked where my vac line goes in. It goes straight into the intake manifold towards the back. If it were only connected to 2 of the cylinders your vac pressure would would fluctuate like crazy and it probably would not give you enough vac to even run the brake booster. So as I see it, it is connected to all 8 cylinders.
Yes it has been confirmed by Jim Davis....
1998 Tahoe 5.7 Sea Foam FYI -
You can use Sea Foam as often as you would like because Sea Foam is a petroleum blend with no harsh chemicals.However on that application, a 98 Tahoe with the vortec 5.7 engine with CPI ,the vacuum source on that engine only feeds the back two cylinders.So the other 6 cylinders get no benefit by inducing Sea Foam into a vacuum line.On that engine we recommend only using Sea Foam in the fuel @ 1 oz per gallon.You will get the same benefit to all cylinders using Sea Foam in the fuel and will clean the injectors also when using in the fuel as you drive.
Jim Davis
Sea Foam Sales Co.
Technical Service Manager
ASE Certified Auto Technician
taken from this link...
http://www.tahoeyukonforum.com/forum/showthread.php?t=2019&page=2
I thought that in our OBS trucks, the vacuum line only went to 2 out of the 8 cylinders, thus making the seafoam pointless through the vacuum.
It's been recommended that the only way to fully treat our OBS is through the gas tank.
Can someone chime in to confirm this?
I just looked where my vac line goes in. It goes straight into the intake manifold towards the back. If it were only connected to 2 of the cylinders your vac pressure would would fluctuate like crazy and it probably would not give you enough vac to even run the brake booster. So as I see it, it is connected to all 8 cylinders.
Yes it has been confirmed by Jim Davis....
1998 Tahoe 5.7 Sea Foam FYI -
You can use Sea Foam as often as you would like because Sea Foam is a petroleum blend with no harsh chemicals.However on that application, a 98 Tahoe with the vortec 5.7 engine with CPI ,the vacuum source on that engine only feeds the back two cylinders.So the other 6 cylinders get no benefit by inducing Sea Foam into a vacuum line.On that engine we recommend only using Sea Foam in the fuel @ 1 oz per gallon.You will get the same benefit to all cylinders using Sea Foam in the fuel and will clean the injectors also when using in the fuel as you drive.
Jim Davis
Sea Foam Sales Co.
Technical Service Manager
ASE Certified Auto Technician
taken from this link...
http://www.tahoeyukonforum.com/forum/showthread.php?t=2019&page=2
