Engine idling too high

Hello,

It sounds like the MAF sensor needs to be replaced or the throttle bore needs to be serviced. Here are two guide I want to run through.

https://www.2carpros.com/articles/engine-idles-too-high

and

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

Please run down these guides and report back

Cheers,

Clean throttle plate on both sides with choke cleaner and iac hole, then check for a vacuum leak like hose off /broken etc.

Hi:
Is the check engine light on? Also, did you check the idle air control valve (IAC)? Without a code, it could be a few things. If the light is on, have the computer scanned at a nationally recognized parts store. Most will do it for free.

Let me know what you find.

Joe

If you haven't had it looked at yet, a scan tool that shows engine data will be the primary source of your diagnosis. Barring the basic checks, floor mat wedged on pedal, giant vacuum leaks from the engine making a loud hissing noise or the air filter lid left off of course.

If you can get access to a scanner check the throttle position sensor position (tps) first. At a stop with your foot off the gas it should read 0.0 volts. If the engine sees the sensor too high it believes the gas pedal is being pushed and will compensate by adding fuel, which causes the idle control to compensate for near stall from a rich condition and you have a high engine revs.

Post back if you need further assistance.

Good luck.

Excellent work on the Idle Air Control! I am certain we can figure this new problem out. We'll start with a couple of checks and questions to get started.

1) Does the overheating occur after 1 mile even when started cold? (Has sat for at least 3 hours)
2) Is the overheating symptom the gauge, and if so where is the needle rising to?
3) Is the overheating symptom steam from the engine?
4) What are the coolant levels for the radiator and overflow tank? FYI the overflow tank often looks as if it has fluid but is just a small bit that wouldn't drain. You can verify if fluid low in the radiator by filling and noting how much it needed. Add slowly and allow time for air to escape.
5) If the fluid is about 1 gallon low, pressure test the system with a pressure tester while the system is full and inspect under the hood and on the ground for the source of the leak.

Here is a site link for the basic coolant checking. https://www.2carpros.com/first_things/coolant_leaks.htm

I've probably overloaded you for now so, post back and we will proceed with the diagnosis.

Regards,

Clean the throttle-body and idle air control. Check for any applicable trouble codes. Check the TPS. Check for vacuum leaks.

When the problem occurs, if you block off the mouth of the throttle body, any effect on the idle? With intermittent issues, you have to check when problem is ongoing.

Possible idle air control motor failure or a large vacuum leak

Roy