Question about 2003 Chevrolet Silverado 1500

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Idle on 5.3L Silverado

After my engine warms up, when I put into gear, my RPM's drop to 400 to 450 RPM's. What can i do to resolve this issue, It seems there isn't a idle adjustment on this motor. Thanks, Bill

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  • harry bone Feb 07, 2009

    the idle on my  2003 chevy drops as soon as i put it in gear, down to 200 rpms. but before i put in gear the idle is already low 450 to 500 is this normal i seem to remember the idle being around 7-800

  • Anonymous Feb 10, 2009

    engine idols 1000rpm put in drive drops to200 rpm dies

  • Anonymous Feb 22, 2009

    mine idles ruff when stopped, up and down like it begging for gas. what can i do???

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  • 1,450 Answers

Remove the air intake and clean throttle plate. using a rag and carb cleaner spray it down hold open and wipe down

Posted on Dec 08, 2008

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1 Answer

Why does the voltage drop to battry volts when i put the gear lever in drive?


the voltage should remain at 14.5 volts at all engine speeds above idle 13.9 volts at idle indicates that the alternator is charging but not at set voltage
head lights are the biggest drain that affects charge rate rate and it it maintains and from you description that is not a problem
when you select a gear it indicates a heavy drain which is a high resistance or a dead short in that circuit that is taking out more power than the alternator is charging
There there is nothing in the gear selection that draws such power
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for auto vehicles , the idle rpm should be at 800-900 rpm dropping to 750-800 in drive

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1995 chevy silverado cl1500: high idle @ 1800 rpm: replaced all sensors, some twice.


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'99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------


which car is it?

problem with 1993 Geo Prizm '99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------

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The tachometer shows 900 RPM on idle position but as i put the car in gear and release the clutch the RPM drops and u have to race the car manually through accelerator pedal.recomend the diagnostics a


The engine does not need to be raced when cold

The vehicles computer will adjust the idle according
to how the manufacture programmed it

After about one mine or so, the idle on most vehicles
comes down to approx 750RPM, generically speaking

When you put the car in gear,assuming it is an automatic,
the rpm will drop a 100 at most & may be adjusted by the
computer, just as it does when you put the A/C on. That is
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You should be waiting for the rpm to come down to 650 to
800 & then a couple more minutes for some temp to come
up, before driving off. In cold weather wait at least 5 min or more

I think your vehicle is not working correctly, or you not explaining
it in a way I understand what answer you want

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Rpm idle setting


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My car slams when put into drive. is it the idle


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