Hey guys!

I am new to the forum and appreciate any advice in advance.

So heres the situation.

Just wrapped up a head gasket job on 2002 4.7 liter tundra.

Truck will not start. Not good....very dissapointed. Lots of work with no reward.

I would first like to eliminate a timing issue considering this is the first time I have timed an engine this complicated.

Timing process used.

All work was performed with crank at tdc. Once timing b was removed I rotated the cams when neccesary to perform work.

For install I verified that cam gear timing marks were lined up when I reinstalled cams. Right bank single dot, left bank double dot. Rotated cams several times. Gear teeth dead on marks.

Checked lash to spec.

Set crank at TDC. Set both cams at tdc. Installed timing belt with marks lined up accordingly.

Cold cranked engine and everything turned great.

Cold cranked engine with plugs out, looking down the plug hole on cyl 1. During exhaust stroke exhaust valves were starting to close up when cylinder was approx 2/3's to top. During intake stroke, intake valves were starting to close up when cylinder was nearly at bottom. During compression, when cylinder was at top, both intake and exhaust were closed.

Does it sound like I did this right???

The only thing I did not do was verify crank was at tdc of compression stroke. Like procedure says. But I dont see how that matters considering what the valves are doing dictates what cycle your in of intake/compresion/fire/exhaust.

When I turn engine over with ignition it sounds fine for 5 secs...then I hear a very faint rumble start.

Check engine light is on.

Could this be a positioning sensor issue?

Whats the potential for valve slap and damage if I keep cranking while trouble shooting other possible problems like electrical or sensors.

Have a good one guys!