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Rpm Fluctuate while driving

RPM's Surging

Rpm Fluctuate while driving

Postby todd101 [OP] » Jan 24 2012, 4:33pm

Hello, i have an 09 sierra, 5.3L 4 speed. Lately I have been noticing that the rpms will surge between 100 and 200 when I am driving between 40 and 50mph. Has anyone else experienced this?
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Related Topics  RPM fluctuation   tuning: what RPM limit?   Rpm fluxuation Around 45-50 Mpg   3000 RPM AT START UP   Whats acceptable fluctuation in RPM   1000 rpm idle all of sudden   Engine Stumble at Low RPM Cruising   RPM drop to 300 then back to normal at stops   '99 Silverado high speed/low rpm sputtering   cold driving   Winter driving   cold driving slow to go   Driving with MAF unplugged   Oil Pressure is driving me nuts!!! 
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Re: Rpm Fluctuate while driving

Postby lzn197 » Jan 24 2012, 6:16pm

Could it be your Torque Converter Clutch releasing as yopu drive? Are you a left foot braker? If your left foot is barely touching the brake, it can cause this.
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Rpm Fluctuate while driving

Postby Bigredchev » Jan 24 2012, 6:53pm

If your truck has afm the Rpms will increase 100-200 rpm when it goes I to 4 cyl mode. They will come back down when it goes back into 8 cyl mode
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Re: Rpm Fluctuate while driving

Postby todd101 [OP] » Jan 24 2012, 7:31pm

So maybe it is switching back and forth from 4 to 8 cyl mode. That makes sense. I notice that it does it more often when the temperature outside is below freezing.
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Re: Rpm Fluctuate while driving

Postby starspangled6.0 » Jan 24 2012, 7:37pm

lzn197 wrote:Could it be your Torque Converter Clutch releasing as yopu drive? Are you a left foot braker? If your left foot is barely touching the brake, it can cause this.





Is there an easy fix if the clutch is releasing at speed? I've been having similar issues with mine (4L80E)- RPM surge at 65 MPH+; seems like the TQ is unlocking. I checked the fluid level, and it was low, so now that I've got it right, the transmission is much better. I hope it's fixed now, but I'm not 100% sure.
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Re: Rpm Fluctuate while driving

Postby Afd38 » Oct 19 2013, 3:32am

Have had the same issue w v8 vortec 07 silverado w 4" lift for two years that I've owned it. Taken to dealership on three occasions. They hook it up to computer and issue clears up only to return a couple weeks later. Any ideas? Will issue lead to future, more serious problems. I love the truck but am getting ready to dump it.
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Re: Rpm Fluctuate while driving

Postby GM Customer Service » Oct 19 2013, 10:22pm

Afd38,

I am truly sorry to learn that you are experiencing an issue with your vehicle and that it seems that the dealership cannot duplicate the issue. How you thought about getting a second opinion? I am happy to locate another dealership in your area and I could set up the appointment. Private message referencing this thread including your contact information, VIN, and current mileage if I can be of any assistance.

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Re: Rpm Fluctuate while driving

Postby EKinMN » Oct 19 2013, 11:54pm

Bigredchev wrote:If your truck has afm the Rpms will increase 100-200 rpm when it goes I to 4 cyl mode. They will come back down when it goes back into 8 cyl mode

Its definitely this. And yes, mine gets worse when its cold too. An ECM reset helps for a while.
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Re: Rpm Fluctuate while driving

Postby silverado745.3 » Jan 08 2014, 5:44pm

I am having the exact same problem 2005 silverado 5.3. Just started when it got cold outside. I have serviced MAF and TB but still there.also seems as if rpms hesitate to drop when stopping. Could k&n filter have anything to do with it? Please help
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Re: Rpm Fluctuate while driving

Postby 02PEWTERSLEEPER » Jan 11 2014, 10:48am

mine does this too between 40 and 50 mph it almost sounds like a very very light slip and catch but i have no idea. Aftermarket exhuast made it more apparent.
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