cruiser54

Fuel pressure is way too low. Should be 31 with vacuum line attached to the fuel pressure regulator and 39 when you pull the vacuum line off. Could be as simple as the ballast resistor as mentioned, and/or a deteriorated rubber hose inside the tank, or a bad ground for the fuel pump. Ever refresh the ground behind the left taillight?

Black is vacuum to the dash controls. Pink is from dash controls to heater valve.

A multimeter from Harbor Freight is less than $5.

Year and engine? You can eliminate that valve and plug it's vacuum source with no ill effects.

New fangled gasoline attacks that in-tank hose.

Common.

It stops the flow of coolant through the heater core when vent or AC is selected. Oh, and the thing it's mostly noted for: Disintegrating at the most inopportune time and causing a huge coolant loss. Eliminate it. There is no downside. Cruiser, This thread got me curious to check and I see that I now have it with everything still connected. How do I bypass and how could a failure result in losing coolant? From where does the coolant flow out if the valve fails? Thanks Those plastic valves just split and spray tons of coolant out. Remove it and put a straight piece of pipe or a splice in it.

So, for clarification, you used a flat .003" feeler gauge on either side of the throttle plate?

12 volts or more to the O2 sensor heater?

You made me think of something I did and forgot about.

It stops the flow of coolant through the heater core when vent or AC is selected. Oh, and the thing it's mostly noted for: Disintegrating at the most inopportune time and causing a huge coolant loss. Eliminate it. There is no downside.

No kidding. What a bear.

I made it out of a longer one. The original isn't as strong as the spring in my Bic pen......

I have the blue one. Took it out of one of my parts rigs. Maybe I never noticed it before.

I stole your photo and put it in my first post.... Not sure about this, bur now I get a warning if I leave my headlights on and open the door......

Gotcha. LOL

And? All I did was change the little spring to fix mine.......

YJ was called Yuppy Jeep when it first came out.

Remove the wiper arms and cowl panel. You'll see what's going on.

Subscribed as this is what a buddy is doing: 97 TJ frame, axles and transfer case, 4l60, 5.3 Chevy, stretch the frame 10", put a 59 Willys wagon body on it.

Are your engine to trans bolts loose or missing? CPS harness routed properly?

Thanks! And do you know how many bulbs there are off the top of your head? No problem if not. I don't think he has any bulbs on top of his head.

Huh?

Yup. Identify the connector hanging under the dash and plug the module in.