Can a bad throttle body cause high idle?
When a throttle body is not functioning correctly, some noticeable characteristics may be poor or very low idle. In the case of a vacuum leak, you may experience a very high idle, which is caused by too much air being allowed into the intake system.
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.
What kind of transmission does a Honda Civic have?
Transmissions included a standard 5-speed manual, as well as a 4-speed automatic on the DX hatchback, and all sedan models. The sixth generation of the Civic was still a step forward, though, not as big a step compared to previous years. Sedans were still available in DX, LX, and EX trims, but Honda reduced the hatchback to only two, the CX and DX.
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.
How to clean the idle air control valve ( IAC )?
How To Clean The Idle Air Control Valve (IAC): One common problem is a buildup of carbon or fuel varnish deposits in the idle speed control valve. The cure for this condition is to clean the valve, with some aerosol throttle cleaner or engine top cleaner. Follow these common instructions: Disconnect the air intake ductwork from the throttle body.
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 causes a lumpy idle on a Honda Civic?
A failing IACV will result in a hunting idle (where the revs go up and down without accelerator input) or a lumpy idle (where the idle will fall until the ECU compensates and rises it again repeatedly). To fix this, either replace the IACV or clean it. Figure 2. Idle air control valve
How To Clean The Idle Air Control Valve (IAC): One common problem is a buildup of carbon or fuel varnish deposits in the idle speed control valve. The cure for this condition is to clean the valve, with some aerosol throttle cleaner or engine top cleaner. Follow these common instructions: Disconnect the air intake ductwork from the throttle body.
A faulty alternator can fast idle issues; if so, replace it. Similarly one may ask, can a bad throttle body cause high idle? Poor or High Idle In the case of a large vacuum leak, you may experience a very high idle because too much air is being allowed into the intake system.
How to do throttle body cleaning and idle relearn?
1. Start and idle the engine in PARK for 3 minutes. 2. With a scan tool, monitor desired and actual RPM. 3. The ECM will start to learn the new idle cells and Desired RPM should start to decrease. 4. Ignition OFF for 60 seconds.
What should I do if my Silverado Idles high?
Replaced Throttle body On 2008 Silverado And It Idles High. Help! Replaced Throttle body On 2008 Silverado And It Idles High. Help! I cleaned my throttle body and replaced throttle body position sensor on my 2013 Chevy Silverado 5.3L.
When to replace the throttle body on a Silverado?
I cleaned my throttle body and replaced throttle body position sensor on my 2013 Chevy Silverado 5.3L. My truck idles fine until I press the accelerator … read more
Why does the idle go up after cleaning the throttle body?
The idle is going to be high at first until the computer relearns the idle again. Cleaning the throttle body allowed more air to enter the engine, and the computer is compensating by adding more fuel.
Is it normal to have a high idle?
I recommend to remove the idle air control valve from the throttle body, clean it, and also clean the throttle plate. That should help with the high idle. Though again, it is normal for cars to experience high idle until it reaches operating temperature.
How long does it take for GM throttle body to relearn?
If you don’t do a relearn procedure, the PCM will “hunt” for a new baseline idle. It will eventually learn it on its own, but it may take over a week of driving, during which time you will experience high and low idle speeds and possibly rough idle. 1) Start the engine and let it idle in park for 3 minutes.
Can a bad throttle body cause an engine to die?
A not calibrated throttle body can also cause this. You can calibrate the throttle body with most diagnostic scanners. The throttle body can affect the RPM the other way also. It can cause the RPM to be so low at idle so that the engine will die.