84 300 Z AE - Valve Noise & Bogging

[smokerz]

Just purchased this car, prior owner had started taking the engine apart, said it needed a head gasket, didn't get too far on dissassembly(definitely not a mechanic). Reassembled & cleaned up ignition. Fire up engine to find Clack clack clack coming from the front right cylinder head. Car has been sitting for 2 years. Engine bogs when accelerator pressed. Appreciate any advice on where to start looking. could a valve train component be frozen up due to sitting? Also noted a connector with nothing plugged in at the front of the passenger side cylinder head just in front of the distributor harness? Is this for a detonation sensor? Have looked every where & not found the other side of this connector? Ideas?

Appreciate any suggestions you might have.

[NISTECH]

he was probably doing the head cause it broke a t-belt. I suspect it broke the belt and taged valves which is where your bog is coming from. do a compression check on all cyl's if the right bank has a low cyl I'll bet thats what happened and you will need to r&r that head to inspect for piston damage, head warpage and replace the bent valves. Have the valves tested by a machine shop as you may not be able to see a bent valve physically cause it will be bent so little.

[smokerz]

Will be getting into the job this weekend. Thank you for the advice. If I find compression ok, Will pull the valve cover for a closer inspection & assess the next steps.

[smokerz]

On the valve noise, is it possible this is a collapst lifter? Noted in the manual discussion around bleeding the hydraulic lifters. If this a common or uncommon problem?

[NISTECH]

Its not all that common but it does happen.

[smokerz]

FYI, cured the valve noise by using an oil additive, Suspect lifters were not primed appropriately, possible something hung up from sitting. Running quite well, now on to the Transmission.