What kind of valve timing does a VTEC engine use?
The VTEC system provides the engine with valve timing optimized for both low and high RPM operations. In basic form, the single cam lobe and follower/rocker arm of a conventional engine is replaced with a locking multi-part rocker arm and two cam profiles: one optimized for low-RPM stability and fuel efficiency,…
What should the idle RPM be on a cold engine?
Turn the tachometer knob selector to the appropriate number of cylinders on your engine. Start the engine and look at the rpm numbers. For a cold engine, the fast idle rpm should be anywhere from 1,500 to 2000 rpms, according to your service manual specifications.
How can I tell if my idle control valve is working?
To check if an idle control valve is working properly, start by turning on your engine and letting it run for a minute or 2. Then, when it’s at an idling speed, take note of the RPMs in your car. Next, turn the engine off and disconnect the idle control motor under your hood.
What should the fast idle thermo valve read?
Place your finger over the fast idle thermo port again and feel for any vacuum suction. The engine idle should now read from 675 to 750 rpm, according to your tachometer. This means the fast idle thermo valve has closed, cutting off vacuum.
What should the idle speed be on a Honda Civic?
Turn off the car. Reconnect the IACV, and reset the ECU by unplugging the back-up fuse. Restart the engine, and the idle speed should be in the 620 to 720 rpm range. Replacing the entire throttle body is probably the best option if this is the case, but that’s an expensive fix.
To check if an idle control valve is working properly, start by turning on your engine and letting it run for a minute or 2. Then, when it’s at an idling speed, take note of the RPMs in your car. Next, turn the engine off and disconnect the idle control motor under your hood.
What should resistance be for idle control motor?
Connect an Ohm meter to the two and measure the resistance between them. Fords are designed to operate with the resistance in the solenoid in a range between 7.0 to 13.0 ohms. If the resistance is outside that range, the idle control motor needs to be replaced.
What does it mean when idle control does not increase?
If the engine idle does not increase, it means there is an issue at the idle control motor of its circuit preventing the signal from changing the idle. You can purchase a bidirectional scan tool at your local auto parts store. Make sure the wiring harness is firmly connected to the idle control motor before conducting this test.