Lazy o2 sensor?

[Vilpo]

Ok, i did the "Controller Grounds", "Fuel Pressure" -tests and completed with no problem. Secondary ignition was tested with an INLINE light, since that was only type i could find here, light lit up the same with every plug. I also adjusted timining. The same time we tested the compression also, just in case. I didn't expect there to be nothing wrong with them, because of recent rebuild. Very even pressures, 8.7 psi difference between highest and lowest reading.
What should i be testing next..?

[NAJ]

Well, this is all that is left.

At this point in the diagnostics, the engine control system has been ruled out as a possible cause for the driveability problem. Therefore, the following items should be checked:
ENGINE VACUUM -- Must be at least 13 in Hg in neutral.
ENGINE VALVE TIMING -- Set to manufacturer's specifications.
ENGINE COMPRESSION -- Must read within manufacturer's specifications.
ENGINE EXHAUST SYSTEM -- must not have any restrictions.
ENGINE PCV SYSTEM -- must not have any restrictions.
ENGINE DRIVE SPROCKETS -- cam and crank shaft.
TORQUE CONVERTER STALL SPEED -- to manufacturer's specifications.
POWER BRAKE BOOSTER -- Check for internal vacuum leaks.
FUEL CONTAMINATION -- Check for high alcohol and water contents.
FUEL INJECTOR -- Check for plugged or restricted injector, control wires correctly routed.
NOTE: If you were directed to this test form the oxygen sensor and the rich or lean condition is not caused by one of the above items, replace the engine controller.

[Vilpo]

Ok, thanks. So, how could i check the valve timing, i mean is it possible to check the cam positions by just opening the valve covers?
Also is it possible to somehow check for exhaust restrictions?
Thanks again for any help.

[NAJ]

You will have to bring #1 cylinder to TDC on a compression stroke, being sure that the mark on your timing indicator is at 0 degrees( and the rotor is pointing to #1 cylinder on the distributor cap) then you will have to remove the upper timing cover and be sure the cam sprockets are properly aligned.
They make an adapter/kit to check exhaust backpressure. the adapter threads in where the O2 sensor is and a vacuum/pressure gauge connects to the adapter.
Exhaust backpressure should read no more than 2 PSI @ 2000 RPM's.
If you already own a vacuum/pressure gauge you may be able to make the adapter.
The thread is 18mm x 1.50 so you need something to thread in with a port to connect the gauge.
I purchased the adapter seperatly from Snap-On many years ago and everything I have seen now is the gauge and adapters for around $40.00.

[Vilpo]

Ok, thanks. I think i will be able to make some kind of adapter to measure the backpressure.
Actually i know already that the cam sprockets are in their timing marks, since i just replaced the belt but i meant that should i also check the camshafts for right alignment? And if so, how could that be done..?