[V8] MPG Partial Update

Ingo Rautenberg ingo.rautenberg at gmail.com
Tue Apr 24 19:05:30 EDT 2007

So how's that Seafoam 'Fix' working out?  I just parked my V8 at a  
big angle on the drive and poured 3 capfuls (brakeKleen cap) into  
each cylinder on one bank and will let sit for??? 2 hrs, 4 hrs??...  
and then do the other side (making sure to completely cover the  
piston.  You can hear it doing it's work.  Sounds like alka selzer in  
each of those cylinder bores :-)  All the plugs looked normal, btw.


On Apr 16, 2007, at 8:44 AM, Jason Wilkerson wrote:

> Got to work on the V8's MPG problem again.  Short replay - bad MPG  
> leads
> to tests - find O2 code - find one cylinder 50-60psi low on  
> compression.
> Update - Tested compression again - found low compression, did  
> leakdown -
> seems to be leaking past piston and coming up out of the  
> crankcase.  SO -
> this means that the valve train is tight and I'm looking for a motor -
> well maby not.  On a whim I thought 'hey, I'll try some seafoam -  
> what do
> I have to loose?'  I put the cylinder in question to TDC  
> compression, turn
> it back a few degrees, pour seafoam in the spark plug hole, pull  
> the crank
> back a few more degrees, then back to TDC.  Then I place air  
> pressure on
> the cylinder - as to force the liquid down past the rings so it can  
> soak,
> expecially at the top of the piston, where gravity is against you.   
> I let
> it sit for 8hrs or so, turn it over without a spark plug, as to not  
> create
> bent rods via hydrolock, replace everything and start it to let it  
> burn
> all that seafoam out.  Run it till it quits smoking, pull plug, check
> compression - 145psi!!! - thats a clean 55psi better than I have  
> ever got!
>  I'm really exited, but I don't want to get my hopes up too much - I'm
> still afraid that the seafoam was causing a 'false seal' that will  
> fade
> with time - but I don't think so because I let it run plenty long  
> enough
> to burn that off.  I will drive it tomarrow and post back my  
> compression
> results.  I think if the O2 code disappears, and my MPG's are back  
> up - I
> will know the truth faster!  One can hope.  Thanks for beiing my  
> sounding
> board!
>                 Jason
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