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Question bout RPM's

Donnie Summers
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Donnie Summers Enthusiast

Donnie Summers

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I have a 2020 GMC Sierra SLT 5.3 10 speed Trans, Is it normal that reving up at idle it's like it has a rev limiter and will not let engine rev all the way to redlining it? I can only get RPM's up to 4000 to 5000 RPM...

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Donnie Summers Enthusiast

Donnie Summers

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Thanks guy's I never do it either but was sit'n in the shop and jus got it back from dealer for a dead battery with only 54 miles on it and was check'n things out and saw the charging below 14 volts so was jus revving up to see if alt. would kick in and noticed the rev limiter...

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redwngr Senior Enthusiast

redwngr

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Alternator is 'managed' by the computer -- it is not a simple voltage regulator like in days gone by. 

 

There is a long list of things it uses to determine what output level it sets for the alternator.

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