Desotodavid

Hello!

I hope someone can help me, this car is making me sick.

This LQ4 came to me with a clogged cat, caused by worn out Valves and seats due the use of LPG as fuel.

The Heads became special self lubricating Seats and Manley Race Flow Valves, it tooks 3 Weeks until i got the Heads back.

After all was together the engine started right up, but there was a knocking, i thougt from a lifter.

I stepped a bit on the throttle an heard a squeeking noise, i shut off immediatly.

After inspection everything looked fine so i started again, the squeeking was gone but the knocking not.
But the Oil Pressure was too Low!

I dropped the Pan and found out that the #3 Cam bearing was walked forward in its bore.
After some google searching i found out that this is not uncommon with the 6.0

Lucky to find the new Problem i replaced the Cam Bearings 1-4 with the Engine in the Car. #5 is impossible to change without pulling the engine. New Cam (stock) and timing Set came also in.
I also looked at the Rod bearings, they look like new. Oil pump disassembled/cleaned.

But the knocking remained.

Then:
-Pushrods checked, not bent
-Rockers look and feel good
-dropped pan again for changing Fel-Pro Pump O-Ring to new OEM, no difference
-Heads up again for new lifter, still knocking

When i touch the Timing Cover i can feel the knock, so i removed it and everything looks fine.

I made this Video, maybe someone can help me.
http://www.youtube.com/watch?v=FQyK1...ature=youtu.be

Thanks
David

Manita0909

David! This is a 7 year old thread but what ever happened to your lq4? You've described my predicament to a T.
Thanks,
-Mark

G Atsma

David has not been around here for 6 years.