Question about Cars & Trucks
The knob is on top of engine w/ spring under it,seems to have no effect on engine when turned
I have been thinking about your request over and over (lol). First I wondered if you might be describing the Throttle Body, but there isn't a six sided knob. So I looked again and I believe you are referring to the valve cover. The valve cover is made of aluminum, rectangular, and is on top of the motor. The oil fill-cap is a six sided knob (no spring underneath but could have in inside it to let it click), and there are four spark-plug wires coming out of the valve cover that you may think are vacuum lines. Please write me back and let me know if this is in fact, what you were describing. If not, try describing other parts that are next to this part (in question). Good luck.
Posted on Mar 13, 2014
Testimonial: "no, this is a black knob about size of a dime,vaccuum lines going to it, seems to have no effect on idle 22-re engine 94 toyota base pickup 4 cyl."
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Posted on Jan 02, 2017
I have the diagram you need. If you send me your email I will scan it off and send it to you. email@example.com
Posted on Sep 12, 2009
Sorry I don't have the diagram, but I do have a diagram of the engine and component locations. Your vacuum system is fairly simple. You have a MAP sensor attached to the air cleaner. I have pasted a picture below. It has one electrical connector and one vacuum hose that goes to the intake manifold or the throttle body.
Behind the right headlight is your evap canister. This will have a hose or line running to the fuel tank. Then it will have another hose going to the purge valve. The purge valve should be close by and it has a connector plus another hose that goes to the intake manifold.
Then you have the PCV hose that goes from the PCV valve in the valve cover to the air cleaner or intake manifold. I think yours just has a hose from the air cleaner and the rest is internal.
There is one more vacuum hose, and that is the bog one that goes from the intake manifold (or throttle body--looks to me like there are a couple of vacuum ports on the back side of the throttle body, and there may be a "T" on one of the hoses) to the brake booster. It this one was off, the engine would not run, as the vacuum draw is large. Please let me know if you cannot figure it out from these instructions and provide a picture, if you can.
Posted on Oct 30, 2011
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