What causes a vacuum motor to run too rich?
Running with stock programming with a low idle speed setting combined with the fact the chip is designed for 20-21″ of vacuum at that idle rpm with a cam upgrade which typically drops the vacuum to 18″ or less will cause the motor to run too rich which will spawn a high idle speed where the motor will then lean out and rpm drops and repeat.
Why is my air conditioner choke not working?
If the vacuum level checks out and your getting at least 16″ which is typically enough that it wont foul out spark plugs and your still too rich then it can also be the coolant temp sensor. the one in the intake manifold near the thermostat housing. this controls the choke. When they fail and they do.
Why are my brake lines going bad on my Chevy Silverado?
Usually, lines go bad by bursting, as has happened to you at the beginning of this ordeal. But if the new lines are a different inner diameter than the old ones, they will be moving more brake fluid, and your master cylinder may run too low and aspirate some air into the system.
Why does the check valve open on an accumulator?
When the pressure in the power chamber is lost due to a failure, the input rod linkage will override the power piston linkage and cause the check valve to be opened. The open check valve will release the stored fluid in the accumulator into the power chamber which will provide the power assist.
Where is the vacuum line on a GMC Truck?
The year range is pretty non specific. If the truck has a vacuum hose to the transmission (to the vacuum modulator), the line will be a metal tube attached to the large tube that the transmission dipstick is in. It will come up and connect to a hose that will run to the base of the carburetor. The function of this line and…
What happens if the vacuum hose is missing from the transmission?
The transmission will work without this line, but the shifts will be hard as if the throttle was all the way to the floor. If the hose is broken or missing, there will also be a vacuum leak at the carburetor, causing a rough/high idle and possible an intermittent backfire.
Where does the gas line go in a GM Truck?
The vent line continues into the engine compartment along with the rear brake line. The vent line goes to vapor canister mounted near the radiator on the drivers side. If you remove the vent line from the canister, you should be able to blow through the line to the tank. Take the gas cap off first.
How is fuel venting done on a GM Truck?
The gas cap is sealed, the venting is done through the line Tim mentioned. There are three lines to the tank. 3/8, 5/16, and 1/4 inch. 3/8 is the supply line. Fuel is pumped through this line from the tank to the fuel metering body. (No TBI on a 97 Vortec). The 5/16 returns excess fuel from the metering body back to the tank.