Question about 2002 Chevrolet Silverado 1500

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Engine rpm surging / fluctuating chevy truck 1500

Coming off a 250 mi trip with no problems, when at a stoplight, engine RPM becomes erratic and fluctuates between 1000 and 2500 RPM with associated stumbling on acceleration. No problem at idle, and after being driven slowly the problem goes away. at speeds up to 50 mph,, only to return on acceleration or going uphill..

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  • Chevrolet Master
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Could be any number of things fuel flow , air flow get codes read to see if it could be an 0 2 sensor leading to a cat problem

Posted on Dec 02, 2017

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Posted on Jan 02, 2017

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SOURCE: Engine pulsates during idle and from second to third gear

Try checking for vaccum leaks, use carb cleaner and spray it around the base of carb, vaccum hoses, edges of intake manifold, take pliers and squeeze the big line to brake power booster & see if it changes, pull the pcv valve out and cover with your finger see if it changes idle.

Posted on Dec 28, 2008

  • 12 Answers

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?

Posted on Feb 07, 2009

ourhowse
  • 2007 Answers

SOURCE: engine starts,reaches high rpm,then slowly returns

Vacuum leaks. Check all hoses and intake bolts. Leaking EGR or plugged PCV valve. Air filter plugged. Leaking head gasket. Worn timing chain. Camshaft lobes worn. Valves burned or leaking. Fuel idle control system or sensor. Good luck!

Posted on Jul 03, 2009

  • 14092 Answers

SOURCE: 2000 silverado 5.3L surges

scan it. check vechicle speed sensor

Posted on Jul 06, 2009

  • 400 Answers

SOURCE: 2001 2500hd duramax idle surge. doesn't do it all

Well there are quite a few things that casue a "surge" in a common rail diesel. You will need to check injector flow rates (scanner only). Fuel pressure regulator for pulsing (scanner only). Supply side fuel system for air leaks (seeing if it is sucking air into the system).
My bet would be the injectors, because you say the rpms aren't going up and down, which is usally what happens when the regulator goes bad, and when you **** air into the supply they have an extended crank. Report back with your findings.

Posted on Nov 24, 2009

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1 Answer

What does it mean when I come to a comelete stop and my car rumbles.


it rumbles as you are about to stop, well that depends.

if there is a vibration AS you are applying the brakes, and about to reach a stop, it could be that your brake rotors need machining, or "turned"; however, in this case, you would also hear a grinding, as well as feel the grinding through your foot.

there is also a "rumbling" associated with a strut mount gone bad; however, this is more of an audible clanking, and is also audible when driving slow on a bumpy road, and not really specifically in the process of stopping.

for either of these, please stop using your radio, and possibly open the windows, to better describe the sound.

IF the car shakes when sitting at a stoplight, or such, please watch your rpm gauge (tachometer), and see if the idle speed is exceptionally low or erratic.

if this is the case, it may be that your throttle positioning sensor, mass airflow sensor, or the like, is malfunctioning, and is giving a warm engine a fuel/air mix appropriate for a cold engine.

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1991 Honda Accord Sta Wgn EX Auto.Car runs great with 435K all original. Trouble starts at speeds above 60. First sign is RPM tach becomes erratic on its own with no associated engine roughness. Keeping...


ever tune it up,?
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the tacho action tells you the primary ingition side is failing.
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jumper the service check connector , 2 pins.
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http://hondatech.info/downloads/Auto/Manuals/Civic/

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You will need to have it replaced to make the vehicle back to it's normal operation again.

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