just bought a multimeter or voltometer thing and was wondering what should the the following sensors read and what should i set the dail on.
iac valve
tps sensor
manfold temp sensor
mass airflow sensor

and what should the fuel pressure be
my car is in my signature

 

For IAC and temp sensors, go to the "How To" pages on Shoebox's website:

http://shbox.com/1/how_tos.html

Temp sensors = Item #13

IAC motor (its not a sensor, its an actuator with two resistance windings) = Item #41.

TPS has 3 wires. Read the supply voltage between the gray wire and the black wire (should be 5.0V). Then read the signal voltage between the blue wire and the black wire ( 0.20-0.90V at closed throttle. The closed volts + approx 4V at WOT, and a smooth transition between the two numbers as you open the throttle).

MAF output is a variable frequency. Not all meters read "frequency", but many of them do. You will see about 2,800Hz at idle (~ 9gps) and 9,000Hz (238gps) at max rpm on a stock engine. Look for 12V on the pink wire to verify the sensor is getting power.

http://members.aol.com/InjuneerZZ/ScanMast.htm

For fuel pressure, you need a pressure gauge attached to the Schrader valve. 41-47psi at idle with the vacuum compensation line removed (43.5psi is the ideal pressure), reconnect the vacuum line and pressure will drop proportional to intake manifold vacuum.... say a 6 to 8psi drop with a stock cam, less drop with a more radical cam.

 

thanks for the help

 

I find it can be pretty tough to "backprobe" electrical connectors with meter leads. A scanner is the easy way to read sensor values.

 

yeah working on buying on of those next.

any recomendations