Question about 2004 Chevrolet Suburban

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2004 Suburban dies after 20 minutes of driving. Just drops out or stubbles and dies or might idle rough then dies. Turn key off a couple of times usually starts up. A couple months ago I forgot to put gas cap on and fuel mpg jumped from 13 to 18 average and it didn't die. Now when the temperature is above 65 or 70 it is back to dying after 20 minutes of driving with or without the fuel cap on. Turning key off and on till you hear fuel pump running and pressure at rail will normally work to get it started and run 5 minutes before dying again. It is at its worst at stop and go driving on hot days, or after idle long periods. Bad smell after starting when it dies. Already replaced fuel filter, fuel pump, catalytic converters, O2 sensors, crank shaft positioner. No codes most of the time when it dies. Vent valve code once after over filling tank(stupid fuel nozzle), O2 sensor lean bank 1,2 other times. Dealer says fuel pump again to start with. This started a year ago after body work for deer damage on the front and then meeting a semi during a heavy rain storm killed the engine. Body man had to take it to GM to reprogram to get A/C to work properly. I did have to add a quart of transmission fluid last month to get to proper level and about eight months ago, which was a month after repairs to front transmission oil cooler. Is there a temperature sensor for engine or transmission that can cause these problems? A ground wire bad some where and how to find them all to check?

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You might have an air or a vacuum leak. Open the hood and listen for a hissing sound when the engine is running.
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.

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Posted on Apr 11, 2011


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