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rpms fluctuating

rpms fluctuating

Postby todd101 [OP] » Feb 03 2012, 4:25am

I have been noticing that my rpms flucuate between 50 and 100 rpms while traveling between 40 and 50mph. I took it to the dealership and they determined that it was the engine switchingback and forth from v 4 to v8 mode. Nothing can be done about it. I noticed that it only happens when the temperature outside is below freezing. My truck is an 09 sierra, 5.3l, 4 speed. Is anyone else experiencing this issue?
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Re: rpms fluctuating

Postby ASTE25 » Feb 03 2012, 4:30am

I have seen RPM's fluctuate before when there was a missfiring condition, however that was normally at idle. Did it just start doing this or has it always been doing it?
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Re: rpms fluctuating

Postby todd101 [OP] » Feb 03 2012, 5:25am

it has been doing it since the beginning of winter, only when the temp drops below freezing. Other than that issue the engine runs normal.
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Re: rpms fluctuating

Postby ASTE25 » Feb 03 2012, 9:05am

Are you b y chance operating the defroster? If so, it could be when the compressor is engaging.
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Re: rpms fluctuating

Postby todd101 [OP] » Feb 03 2012, 5:16pm

I did try that and see if it made a difference but it did not.
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Re: rpms fluctuating

Postby ASTE25 » Feb 03 2012, 7:32pm

I don't have any more suggestions then. Let us know what you find out.
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Re: rpms fluctuating

Postby todd101 [OP] » Feb 03 2012, 7:53pm

will do. Thanks for your time
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Re: rpms fluctuating

Postby terojano » Mar 23 2012, 10:47pm

i've also noticed similar problem
driving 25-40 mph i'll see rpm jump up an down 200-400
i took it to the dealership and was told nothing was wrong
haven't noticed anything since the temp warmed up outside though
was told by a mechanic that it could be the converter not knowing whether to lock up or not
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Re: rpms fluctuating

Postby todd101 [OP] » Mar 24 2012, 1:39pm

The dealer told me that as of right now there is no fix for it. Could be a recall from GM in the near future. Hopefully!!
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Re: rpms fluctuating

Postby EKinMN » Mar 24 2012, 2:34pm

Mine does it too. I never really gave it much thought, other than it's the AFM doing it's thing. I am not too worried about it.
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