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2000 gmc sierra 1500 high rpms

I have a 2000 gmc sierra 1500 fuse box diagram. The rpm's are going up very high after I hit 30 mph and staying there. the truck will still go fast but the rpms will not go down.What are the possible reasons for this?

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5 Suggested Answers

  • 1 Answer

SOURCE: GMC truck exhaust diagram

GUESSED AND IT WORKED!

Posted on Jul 31, 2008


  • 840 Answers

SOURCE: GMC 1500 SIERRA CLUSTER FAILURE

your right it is a problem with them but some repair shops can send them out and have them in a few days.

Posted on Jan 24, 2009

  • 90 Answers

SOURCE: 2005 GMC Sierra Overheating

If your sure there is no trapped air in system after refill and air bleed off, is fan clutch pulling good air thru radiator? Even if it is, the heater should have coolant as hot as what temp gage is showing! Try backwards flushing heater core (dex cool is notorious for plugging these up). There is a TSB for cracked cylinder heads from GM for unexplained coolant loss.Remove drivers side valve cover, and look at center three head bolts for coolant around them, if coolant has been getting in thru this suspect area, there will be a milky/pudding like goo under valve cover and on head. GM had a company called Castec cast these and the areas near the head bolts were found to be too porous (NO recall YET!) Ya, you guessed it, replace heads! Unfortunately, if its gotten hot to many times, it has probably hurt the heads/gaskets. Hope this helps. PS: The castec logo is under the rearmost pair of rocker arms,may have to remove them to see.

Posted on Feb 05, 2009

motor1258
  • 6674 Answers

SOURCE: how to replace a brake light switch for a 1989

Look up under dash where brake pedal pivots, you should see a switch that is activated by pedal arm.

Posted on Mar 07, 2009

ourhowse
  • 2007 Answers

SOURCE: 2004 GMC sierra 5.3 eng 1500 transmission shutter 40-55 mph

Try changing the fuel filter. I think it's starving for gas and the transmission can't decide what to do.

Posted on May 21, 2009

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