Question about 2004 Chevrolet Suburban
Hi You might have an air or a vacuum leak. Open the hood and listen for a hissing sound when the engine is running. Please get back to us if you have further query else please accept the suggestion. Thank you for contacting fixya.com
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow.
If it is hard to pinpoint take some brake cleaner or starting fluid around the intake manifold and vacuum lines and see if the engine stumbles or if the idle is affected. Be extremely careful when doing this.
Also, your throttle body may be carboned up and need to be cleaned! This can cause all sorts of idle and hesitation problems. This is caused by the throttle plate not seating properly. The First thing i would do is Clean out the throttle body with some throttle plate and intake cleaner and a small brush.
Another common cause would be the Idle Air Control motor. This is very common on older cars.Check for restricted air intake system. Check for a possible collapsed air intake duct, restricted air filter element, or foreign objects blocking the air intake system.
Throttle body. Check for objects blocking the IAC passage or throttle bore, excessive deposits in the IAC passage and on the IAC pintle, and excessive deposits in the throttle bore and on the throttle plate. Check for a sticking throttle plate. Also inspect the IAC passage for deposits or objects which will not allow the IAC pintle to fully extend.
You might have an air or a vacuum leak. Open the hood and listen for a hissing sound when the engine is running.
Please get back to us if you have further query else please accept the suggestion.
Thank you for contacting fixya.com
Posted on Apr 11, 2011
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Posted on Jan 02, 2017
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