alright this may sound stupid. but right now i am in the process of removing vacuum tubes and emissions crap off my toyota. i have eliminated the egr system, and SOME OTHER CRAP.

there is a sensor on the valve cover. it has two hoses and two wires. when i unhook the hoses the idle goes down. i think the sen sor may have something to do with the spark advancing system.

any ideas? i'd take a picture but it was to dark last night when i got home.

all i have is a chiltons manual and i searched it for about an hour and a half last night, nothing on it at all.

anyone have a factory service manual? it should be somewhere in there!

PLEASE HELP MEEEEE!!!!!!

There are two of these type sensors on the valve cover. One is for the AC, other............?

I think those are VSV's... I believe 4WD's have 2 and 2WD's have just one. I left them off and have not had a problem as of yet. But I have only ran my EFI converted motor :D about 5 minutes

well since i don't have a.c.

it leads me to believe its the other one!:D :flipoff2:

The vacuum diagram for an 85 22re dosn't show a VSV or Sensor on top of the valve cover. Did your truck have A/C? Is it the original motor? If it had A/C it would have a Vacuum Switching Valve(Red Arrow) that controls the idle up valve for A/C(Blue Arrow)

The other is connected to your 4x4. when your truck is in 4x4 it richens the mixture.


Regards,
Kyle

what? i doubt that it would need to enrichen the mixture!:rolleyes: sorry but that is the most retarted thing i have ever heard.

there is no button for the a.c. but i think it could be it. i guess i'll just remove it. there is no a.c parts anywhere except maybe this sensor thing. unless some retard took it out the a.c.:(

Originally posted by ross-sparky-h
what? i doubt that it would need to enrichen the mixture!:rolleyes: sorry but that is the most retarted thing i have ever heard.

there is no button for the a.c. but i think it could be it. i guess i'll just remove it. there is no a.c parts anywhere except maybe this sensor thing. unless some retard took it out the a.c.:(

Ok-
Than take a look at the vaccum schematic under the hood.
Why would it be capable of cutting vacuum to the fuel pressure regulator? Are you aware of the benifits of a richer mixture? It will reduce the chances of detonation underload and lower combustion temps, both of those would be valuable under a high load condition such as the truck being in 4 wheel drive or towing. If you havnt been working on fuel injected cars for a long time I understand. But you shouldnt tell people their input is retarded. Somone asked for it I gave it. Alot of sensors can affect mixture besides the obvious ones (temp, AFM, o2) on some Mazdas the knock sensor can retard the timing AND richen the mixture to stop detonation.

i have been working on fuel injected cars for a long time. sorry to call you retarted, i was retarted for saying that but it doesn't show up in any books. if i could read the vacuum lines diagram under the hood i would. its all faded and unreadable.

anyway i guess i'll just leave it alone.

He might have called you a tart, and then a tart again, but at least he didn't call you retarded (sp).

By the way, great new handle Sparky.

Originally posted by 4running
The other is connected to your 4x4. when your truck is in 4x4 it richens the mixture.This is a new one on me - never heard this before. I dont think its correct either. The wiring diagram certainly doesn't show it "connected to 4X4".

Dont go trying to yank stuff off the 22RE unless you know something about a specific mod. The only thing that is really optional as far as the engine running and performing correctly is the EGR and perhaps the evaporative emissions stuff. The rest of it is a well-designed system that you really dont want to screw-up by yanking things off.

I am running an LCE crate motor, and they recommend leaving most everything as is.

If you dont have AC, the VSV makes a nice idle-up circuit for onboard air! I think it also idles the engine higher when its cold in conjunction with the aux air valve (on the early models).

Ok-
according to the diagram under the hood that particalur vacuum circuit is only for 22RE's equipped with 4x4 (hence the dotted green line). I know some later Isuzus use a similair circuit connected to the ADD to enrichen the mixture when in 4x4. I assume this is a similar type deal. But it may not be, get a good schematic and figure out where the wires for the VSV go to.

I suppose that wouldnt be the first time I was RE-tarted. As if the first tarting wasn't bad enough ;)

The 2 VSV's found on the valve cover of 22RE & RTE EFI motors are used for A/C idle up on A/C equipped vehicles and fuel pressure increase during hot starts on the 4wd and 1ton models.

The A/C VSV provides idle compensation to offset the idle speed drop caused by compressor engagement. It uses the idle air bypass valve (shared with the power steering pump) to divert air around the throttle plate during closed throttle conditions. Idle speed can be adjusted with the white thumbscrew on the intake while the VSV is engaged.

The FPR VSV is used to increase fuel pressure during hot start up by blocking the vaccuum source to the fuel pressure regulator. Regulated fuel pressure is around 33-35 PSI and unregulated fuel pressure is upwards of 40 PSI. The FPR VSV system was originally implemented to compensate for a rough idle condition encountered during a hot restart. Inside the ECU, The VSV transistor provides a ground to the FPR VSV under an ANDing condition- only for the first 90 seconds after start up and only when coolant temperature exceeds approximately 160 degrees. The Coolant temp switch is found on EFI 4wd and 1 ton models in the water neck just in front of the thermostat.

Wow! thats some real info! But that enrichment circuit is found only on 4x4 and 1 ton models? you'd think it would be on all 22RE's if a hot start problem was an issue.

interesting!