emissions part identification
- Thread starter Claytonk
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
I think the reason it’s not covered in your emissions manual is because it is a idle up unit for A/C.
- Thread starter
- #3
Hmm? I'll have to check by the compressor to see if I notice any vacuum lines that are missing
It connects to the intake manifold. The factory piece/fitting it attaches to is also a vacuum source for the brake booster. I can see it in your first picture. Follow the larger rubber hose next to the brake fluid reservoir (up and over) to the intake manifold and you will see it.
- Thread starter
- #5
I'll check it out tomorrow
- Thread starter
- #6
- Thread starter
- #7
When I turn on the A/C: The vacuum pot (circled red) does it's job in pulling a vacuum and increasing engine idle.
When I turn off the A/C: The vacuum pot does not release the vacuum and thus the engine idle remains high even though the A/C compressor is off. To work around this, I hardly use the A/C. When I do, I have to pop the hood and manually remove the vacuum hose (grey hose above) from the vacuum pot...the vacuum is released, the engine returns to idle, I re-install the hose and all is well.
Question 1: I vaguely remember something about scavenging a compatable...
Okay so I found this post after you guys pointed me in the right direction of what this thing might actually do. indeed it's the AC idle up vacuum actuator
As you discovered, that Idle Up dashpot is for Factory A/C. Not in Emissions FSM. Do you have A/C ? Two things make me think you did not have A/C from the factory: 1- the 'Finned Cooler' in your picture does not have the Vacuum port for the Idle Up Solenoid. That's what was installed at the factory if truck did not have A/C.
2- It looks like you have a York Compressor ?
The function of the Idle Up is to slightly raise the Idle RPMs when A/C is on so truck doesn't lug when moving from a stop with A/C engaged.
2- It looks like you have a York Compressor ?
The function of the Idle Up is to slightly raise the Idle RPMs when A/C is on so truck doesn't lug when moving from a stop with A/C engaged.
Nailed it. The finned vacuum source from the back of the intake manifold doesn't have the AC idle up nipple - that vacuum fitting was for a factory non-AC truck. Good eye Spike. OP could get the correct vac fitting with the AC idle up nipple, or else find another vac source straight off the manifold (probably using a tee).
Other than a Vacuum source, finned cooler with port won't matter to the OP as truck probably doesn't have the A/C amplifier to switch on the Idle Up solenoid.
- Thread starter
- #11
yes it has a/c ( not really functioning )
yes it has the York compressor
It seems to be missing the solenoid or never had it
Its my understanding that some early 60's where ordered without a/c and then were dealer or port installed with the York system when they came off the boat.
Yes, your A/C is aftermarket. Dealer or Port install would have used Toyota parts as that would be bolt-in as all the wiring is there, just unused.. Someone had a shop do it along the line.
That's why you have no Idle Up Solenoid and probably no A/C Amplifier, but you may have aftermarket bits that serve the same function.
Pic of the engine bay, driver's fender will show if there's a solenoid or not.
That's why you have no Idle Up Solenoid and probably no A/C Amplifier, but you may have aftermarket bits that serve the same function.
Pic of the engine bay, driver's fender will show if there's a solenoid or not.
Thanks @Spike Strip and @CruiserTrash - I was a little off in my assessment. And good on you @Claytonk for finding the post. Sorry my information was slightly off.