Question about 1990 Chevrolet Lumina

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Just changed fuel pump and now rough idle surges and when stopped at red light my check engine light comes on but goes off when i start moving again

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  • Chevrolet Master
  • 2,431 Answers

Did you just do the pump or the whole module.If you just did the pump the hose at the fuel pump may not be adeqautely secure this can result in low fuel pressure. Just for giggles remove the vacuum hose at the fuel pressure regulator and see if it make a difference if it does redo the fuel pump,secure the fuel pump with new clamps (not those plastic ones)

Posted on Feb 25, 2012

  • Reynaldo Andico
    Reynaldo Andico Feb 25, 2012

    If you are confident of the fuel pump repair and you have rough idle and it smoothes out at load check the EGR it could be open At idle the EGR should be hot to touch.If its too hot to touch its open, and you will need to remove the EGR and remove any carbon that has gotten the valve to stick open.OIr even have to replace the valve

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Posted on Jan 02, 2017

  • 400 Answers

SOURCE: 98 Chevy Tahoe 5.7 liter engine cuts out and

Have you checked for vaccume leaks?
You've got lots of parts in there, Has the problem been the reason you have replaced all of those, or did it come up while doing some of the repairs?

Posted on Dec 18, 2009

  • 12 Answers

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?

Posted on Feb 07, 2009

  • 40 Answers

SOURCE: Rough running and rough idle

Doesnt sound at all like an electrical control issue... more like a tune up...
How many miles? If its hard to start its typically due to spark plugs being worn down with age.. that engine has individual coils per cylinder so there are no "cap, rotor or wires" involved... just replace the plugs, they are platinum and they are about 8-9$$ each x8... but that is what you need

Posted on Nov 25, 2008

  • 8 Answers

SOURCE: 88 silverado 1500 surges at idle and runs rough above that.

may be the egr valve

Posted on Aug 23, 2008

  • 3 Answers

SOURCE: Chevy 1/2 ton 2wd 4.3 vortec rough idle tried everything I know

I had the same problem with my 96 Chevy 4.3. It idled rough enough to shake the truck at a stop. It revved up fine but sputtered on take off. My truck did not want to stay in overdrive because of the low rev. I changed cap, rotor, plugs, wires and this did nothing. Finally I took the intake off and found corrosion on the side intake gaskets near the rear of the engine causing a vacuum leak.

Posted on Nov 11, 2008

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