Catalytic Converter, O2 Sensor & EGR Questions

[fixkick]

SOME of those headers made by Doug thorley are not made now (too few cars on road running I guess)
do you have this slot?


this header  has the magic hidden EGR slot..(and matching new gasket for that , calif CARB certified,  DO YOU have the slot; SOME DO NOT.

THY-716Y-C (or  THY-716Y-SS)   the SS I think is still made, for sure sold.







as you can see this 16v engine had 2 kinds of header,short and long, (calf, and fed)
long tube headers started in CALIF 1992 and later all cards when long.
ending this mess (fails hard) (had after burner plates inside the melt and block exh, flow, yah super bad.. long header is best, and not use  below #1 part

next up CALImini. 

long ago  they made these too  and are very good.

look for the tube   #4 port, seen at rear, here os CALMINI header is EGR fitted. SK703Y-S

My header does have that slot. Also to bring you up to speed where I am at with it now, I got the new cat. It is not melted and is installed properly now. PO removed. Prior to that I checked main cog for damage, replaced the pugs gapped .28 and wires installed properly, I replaced the timing belt but did not move the main and cam crank independently, I set valve lash to .06 but they were only off at .05 and or 0.07 so not much adjustment. The vehicle ran before but will Crank and not start now.

Assuming that all my work is correct could the new cat be the reason for it not starting. Before you answer a little back story. After vehicle would not start I started looking around the engine bay. I found the EGR disconnected from the block with all wires and hoses still connected. It seems that the PO removed the Cat and the EGR. Could the EGR being removed be the reason with the new cat that the vehicle won’t start?

THE EGR REMOVED LEAVES A HUGE HOLE IN THE INTAKE, VERY BAD THAT.
.05" is match book cover thick dont you mean .005" THICK?  or are those metric number?
IS Compression good
spark timing good
does test fuel work (sprayed by hand)'

Yes I meant .005-.007 compression is good and timing good prior. Before there was no cat and EGR was not connected now there is new cat and EGR not connected. Could EGR be the reason why now with the new cat that it is not starting?

what does not connected mean?
there are 3 things (up to)
mounted EGR main, to rear or intake runner #4  (now it cant leak mounted)
one vacuum hose.
and one bark tube to the modulator valve
95 and older has 4th  things the EGRT thermal sensor.


if you have good and fully closed EGR min and leave the vacuum tube not connected but use golf TEE  to plug the vacuum sucking hose,
the EGR is now off line, and out of the pictures
so if spark timing is correct , test fuel will fork,  proving it runs for 3 seconds each spray session. (can of instant start in a can sprayed.)