TOP END REFINISHING

[A26B]

Not burned away.

Autolite® XP Xtreme Performance® Spark Plugs

•Iridium-enhanced center electrode
•Patented, platinum sidewire technology.
•.6-mm finewire design
•Nickel-plated shell

[Franke]

Schrade, what is the gap on those plugs? Should be .035. I don't use Autolite plugs I stay with AC Delco for the Z.
I think the HVAC line goes into the firewall with the harness for the vac operated hvac doors, controls etc. Not sure you can access it at the firewall. Maybe someone else knows for sure.
Vacuum leaks generally show up at idle which I remember was not an issue from your datamaster video.

[mike100]

Yellow circled item is the air injection diverter valve. it is connected properly from the looks of it. The big outlet with no hose is a purge to the atmosphere. the other hose goes to the air injection lines.

[Schrade]

Thanks there Mike - like I've said before, I don't know much... Vacuum does hold at the device, which I'm guessing is correct...

Cruise solenoid - don't laugh too loud

Anyone remember the name of the CF user who's the A/C guru? 'Sun-tech', something or other... (can't log on since being banned) - he is THE A/C expert, and need to know if the vacuum line that goes to the HVAC should hold vacuum when system is powered down.

ed.:
Got it; the CF user is suncr. Dom; Darryl - know if he happens to be registered here? Know him on CF boards there???

[Dynomite]

Originally Posted by Schrade

Coolant cross-over in place, plus new serp belt...

Looking great

Are those new coolant hoses?
Those hose clamps look PLENTY tight

I have to check my 90'.....I do not recall those two wire clamps attached to my AC compressor (what wires are they?)

But then again...I reroute vacuum lines and wires somewhat differently than stock when I rebuild an LT5. For example, the wire bundle going forward on driver side goes OVER upper drivers side A-Arm. I loosen the A-Arm and slip that wire bundle UNDER the A-Arm out of the way.

Are you checking fuel pressure (Schrader valve on passenger side fuel rail)?

[Franke]

Originally Posted by Dynomite

Looking great

Are those new coolant hoses?
Those hose clamps look PLENTY tight

I have to check my 90'.....I do not recall those two wire clamps attached to my AC compressor (what wires are they?)

But then again...I reroute vacuum lines and wires somewhat differently than stock when I rebuild an LT5. For example, the wire bundle going forward on driver side goes OVER upper drivers side A-Arm. I loosen the A-Arm and slip that wire bundle UNDER the A-Arm out of the way.

Are you checking fuel pressure (Schrader valve on passenger side fuel rail)?

Wiring could be compressor clutch?

[Schrade]

Originally Posted by Dynomite

Looking great

Are those new coolant hoses?
Those hose clamps look PLENTY tight

I have to check my 90'.....I do not recall those two wire clamps attached to my AC compressor (what wires are they?)

But then again...I reroute vacuum lines and wires somewhat differently than stock when I rebuild an LT5. For example, the wire bundle going forward on driver side goes OVER upper drivers side A-Arm. I loosen the A-Arm and slip that wire bundle UNDER the A-Arm out of the way.

Are you checking fuel pressure (Schrader valve on passenger side fuel rail)?

Thanks there Cliff...

Coolant hoses are the ones that were on there. You think the clamps are a little too tight? I snug 'em just til the clamp is at the level of the rubber, in a different spot, of course...

The 2 wires on the A/C comp I think are the A/C clutch engage wires.
https://lh5.googleusercontent.com/-5...0/HPIM7538.JPG
In Paul Workman's photo, I can't see them there either... maybe just out of the frame.

Unless you're talking about the 2 vac lines in the Blue bread bag tie? Not too sharp work - I know.

FP guage is still plugged in - I haven't gotten a good leakdown yet - think it still has air in the line. It held good first time, before I broke it down to find the missing socket. And cut the other O-ring in the process

Still gotta' check the vacuum to HVAC hose (hate to go into the dash for that, unless I can find out what circuit to jump, such that it's supposed to hold, THEN check), CC-to-PCV cross-over back in (withOUT dropping the socket), SP boots + wipedown, bolt the TB 2' butterflies into the shaft (thanks again for the screws BF), coolant, and the chip from MarcH for the 2' delete, plenum, ... Maybe another 2 weeks??? UGH..........................

[Dynomite]

Originally Posted by Schrade

The 2 wires on the A/C comp I think are the A/C clutch engage wires.

Coolant hoses are the ones that were on there. You think the clamps are a little too tight? I snug 'em just til the clamp is at the level of the rubber, in a different spot, of course...

Yep....on my 90' those two wire clips were missing and I routed the wire down under the AC pipes.....because I did not know any better

On my 91' I DO have those two clips.....Oh...well

I guess I would have installed NEW coolant hoses (Marc has the coolant hoses as well as Jerry now has the Silicon Hoses and appropriate hose clamps)

Marc Haibeck Coolant Hoses

Jerry's Silicon Coolant Hoses

Jerry's Silicon Coolant Hose Clamps

[Schrade]

Originally Posted by Schrade

Thanks there Cliff...

Coolant hoses are the ones that were on there. You think the clamps are a little too tight? I snug 'em just til the clamp is at the level of the rubber, in a different spot, of course...

The 2 wires on the A/C comp I think are the A/C clutch engage wires.
https://lh5.googleusercontent.com/-5...0/HPIM7538.JPG
In Paul Workman's photo, I can't see them there either... maybe just out of the frame.

Unless you're talking about the 2 vac lines in the Blue bread bag tie? Not too sharp work - I know.

FP guage is still plugged in - I haven't gotten a good leakdown yet - think it still has air in the line. It held good first time, before I broke it down to find the missing socket. And cut the other O-ring in the process

Still gotta' check the vacuum to HVAC hose (hate to go into the dash for that, unless I can find out what circuit to jump, such that it's supposed to hold, THEN check), CC-to-PCV cross-over back in (withOUT dropping the socket), SP boots + wipedown, bolt the TB 2' butterflies into the shaft (thanks again for the screws BF), coolant, and the chip from MarcH for the 2' delete, plenum, ... Maybe another 2 weeks??? UGH..........................

2 weeks for me screwing something up; NOT ON MARC'S ACCOUNT - did NOT mean that Marc!!!

[Franke]

Schrade, Reading in the FSM indicates the black hose from the vacuum tank (left front fender) goes to the heater/AC control head in the dash (black hose) and is where vacuum is distributed to the various duct doors. Pages 8a-68-5. It doesn't look like there is any way to check in between those two points for vac leaks.