Vacuum Hoses

[Foster48x]

Anyone know what's supposed to be hooked up to this vacuum inlet on a 1980 Spider 2000 FI? In the service manual it looks like the fuel pressure reg should be hooked up to it, but as you can see the vacuum from the fuel reg is hooked up to the one on the other side. The engine runs fine without anything attached to it. If you plug it, the engine will bog down and die.

I did notice the vacuum hose from the vapor trap is off. Does the vacuum hose to it go here? Can I leave it open without any damage to the system?

[rlux4]

The open port goes to the fuel pressure regulator. The port being used now is the line that goes down to the vapor canister.
Ron

[Foster48x]

Does it matter if their hooked up backwards or will it make a difference in engine performance. The car seems to run fine with the fuel reg hose on the opposite vacuum inlet.

[rlux4]

Both lines are from the same vacuum source, so it doesn't matter which way they go. As far as the vapor canister not being hooked up, it's part of the fuel system venting is all I know. So Cal Mark, or someone else more knowledgeable than me on the system could say how critical it is. Not sure where you're located, but here in California, it would have to be hooked up to pass smog during the visual part of the inspection.
Ron

[Foster48x]

Thanks again Ron. I live in the Republic of Texas so on a vehicle this old I dont need the smog equipment to pass inspection.

[So Cal Mark]

leaving it open will create lean running, but I'd be concerned with the fact the motor bogs and dies if the fitting is capped. That shouldn't be happening

[spider2081]

It looks like the vacuum line for the brake booster is pinched off in the photo. Would having the vacuum line for the brake booster pinched off cause the amount of vacuum available for every thing else to change?
Also on my car the the cold start valve has a blue connector on it and the temp sensor below the intake manifold has a brown connector on it. Could these connectors be reversed or is the color not important??

[rlux4]

Good call Spider 2081, the colors are important. Unless the connectors have been changed, the signal that should be going to each via the ECU is reversed. Here is a list of the correct color connectors on the system:
Almond: Temp sensor in cooalnt "T"
Brown: Thermo/time switch under the manifold
Blue: cold start injector
Black: auxiliary air regulator
it is strange that the car runs worse with the open vacuum port capped. I'd get all the connectors to their correct placement and connect the vacuum line to the vapor canister, I'll betcha it runs a lot better.
Ron

[kmead]

Keep in mind that having the vapor canister attached and working properly is not going to deprive you of any performance. Regardless of what state you live in, this simple system of holding the vapor and then pulling it into the intake to be burnt has no negative effect on the enjoyment of your car.

[Foster48x]

Thanks for the replies and great observation Spider 2081. Ron, from your list of sensor colors I inspected mine and found that its completely different

Your list
Almond: Temp sensor in coolant "T"
Brown: Thermo/time switch under the manifold
Blue: cold start injector
Black: auxiliary air regulator

My Car
Almond: The 3 rear fuel injectors
Brown: Cold Start
Green: Front fuel injector (I think this may be the blue one. The cold start that the sensor plugs into is green also)
Blue: ???? no blue
Black: Auxiliary air regulator and one with the wires cut on the Coolant "T"

I found the spot to hookup the brown sensor to the Thermo/time switch under the manifold but nothings plugged into it. It also looks like there is a set of cut sensor wires that possibly went to the front fuel injector (the one replaced w/ the green sensor).

So, the car seems to be running ok now. I guess I need to replace the missing sensors and move the rest back to their original locations. Question? are all of the sensors interchangeable/same type just hooked up in different locations?

Thanks,
Rick

[rlux4]

The sensors aren't the same, but the connectors are, except for the one on the cold start valve (blue) It has three wires going to it, the others will all have two. So except for the cold start valve, it wouldn't matter which color is on the sensor, only that the correct line goes to it so that the signal to the ECU is the right one. None of the sensors will make a big difference in how your car runs, except the coolant temp sensor in the coolant "T". If it's bad, or disconnected, the car will either not run, or run very poorly.
Ron

[Foster48x]

Is there a way to test the sensors to see if they are hooked up to the ECU correctly?

[So Cal Mark]

you would have to check each circuit at the ecm

[rlux4]

If you don't have them yet, here are a couple of good FI diagnostic informational pages:
http://mirafiori.com/~thad/fi/
http://www.wcmotors.com/personal/Fiat%2 ... agnostics/
And of course, the must have for every FI Spider owner:
http://www.artigue.com/wp-content/uploa ... 124_MM.pdf
Ron

[Foster48x]

Great resources thanks Ron.