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Rough Idle

Rough Idle

Postby 2011chevy [OP] » Apr 18 2013, 10:46pm

I have a 2013 Silverado with a 5.3. When I am driving and come to a stop light or stop sign the engine idles rough. Had it to the dealer today and they felt it but because the computer is not throwing any codes they would not do anything. They said that the 5.3 ECM will lean out the fuel and the idle will fluctuate up and down. I can look at the tach and see the needle move up and down. The idle goes from about 550 to 493. They said that is normal. Just wonder if anybody else truck is doing this? I only feel this when it is in gear. Cannot feel anything in park.
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Re: Rough Idle

Postby Machster69 » Apr 18 2013, 10:52pm

Mine does it, all of my 5.3s stumble some... But they do it in park also
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Re: Rough Idle

Postby ASTE25 » Apr 18 2013, 11:12pm

Mine did it as well.
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Re: Rough Idle

Postby mjpxd » Jul 04 2014, 1:48am

Just had the same experience after my 2012 Sierra sat for 2 weeks while I was out of town in my wife's car. Truck idled rough and in reverse going out the driveway. Also rough while going slow in drive. When I sped up, it appeared to smooth out but started getting rough when I slowed down again. Appeared to get worse as I went into a Lowe's parking lot. Parked and shut the truck off, put the hood up and then had my wife start it up. Started up smoothly, but as soon as the fans can on the whole front end started to vibrate. Shut the engine off and then I saw the problem. One fan had 6 "mud-dauber" nests in the center ribs throwing it out of balance. When the fans go off the vibrations stopped. Cleaned them out with a screwdriver and the engine idled smoothly. Saved an embarrassing stop at the service department.
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