[V8] MPG Partial Update

[Lanier Pratt]

Just following along with this and am curious what you're doing.
Is this to simply clean out the top of the cylinder or other issues?
Learning as I go.

Lanier
'92 V8Q
'90 V8Q

On Apr 24, 2007, at 6:05 PM, Ingo Rautenberg wrote:

> 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.
>
> Ingo
>
> 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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