Engine NOise Help

[2mnyyotas]

Ok so I have a 99 GTI,The oil injection system has been bypassed.SO im premixing.When it was time for gas I mixed TW-3 oil in my gas.(wrong oil I know now)It ran for about 5 mins and stalled out,Got towed in(very slowly).Got it home and started it up.Sounded like a piston slapping.Pulled the plugs and they looked DRY.(No oil). I am going to drain and refill gas tank with proper OIL.WhaT else should I do?Should I pour something into the cylinders before starting,and what?Should this noise stop with proper lubrication?Thanks for your help,I hope my lack of knowledge doesnt cost me an engine.

 

[2mnyyotas]

Also when I started it at home I shut it down almost instantly when I heard the noise.

 

[seadooya]

spray some wd-40 in sparkplug holes, ground the plug boots to the lugs, and do compression test.

 

[2mnyyotas]

Ok thanks,Do you think the wrong oil would cause this that quickly?The engine was rebuilt by PO before I got it.

 

[seadooya]

nope.........carbs failed you.

 

[2mnyyotas]

Ill do compression check in the am.Thanks for your help Im sure I'll be back with more ?'s.

 

[2mnyyotas]

Did compression test 90 in front cyl and 120 in rear.What now?Rebuild top end?I saw a new cyl head sells for 475,would that be much more expensive than rebuilding mine?

 

[2mnyyotas]

repair or replace?

 

[dsw222]

my 787 was showing 75 psi and 150 psi... i bought the top end rebuild kit for 475

i figure mine is 13 years old so i might as well give it a whole new top end

 

[seadooya]

if cylinders are ok, either get them honed or bored, then do piston kit.