Question about 1991 Chevrolet Lumina

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I just replaced the spark plugs on a 1991 chevy lumina and cleaned the iac and in the process of changing the back plugs the vaccum line to the map sensor was broke,it was hard plastic.i replaced it with soft vaccum i receive a code 33.this was done on a 1991 chevy lumina 3.1 engine.the code was not there before.disconnected battery to reset ecm,but code comes back.can feel the engine idle up right before the code comes on.any suggestions.does the ecm need to relearn everything? thanks for any help.

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  • Mike Wetzel
    Mike Wetzel May 20, 2014

    I found the problem,i accidently pulled the vacuum line off that goes under phleum ,i replaced it and code 33 is gone and car runs great now.


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Well sometimes it takes up to a 100 miles to the module to get things straight! Two many censers map ,maf , knock. cam,o2,and so on! Drive it for a bit and see if it will reconfigure it's self! My opinion I could be wrong! Good luck!!

Posted on May 18, 2014

Testimonial: "kinda what i thought,i felt it was from me messing with the sensor is fairly usually go away after clearing them you have to reset the iac or will it reset itself?thanks for your advice."

  • 3 more comments 
  • Jeff Youtsey
    Jeff Youtsey May 19, 2014

    Deos the soft plastic linesuck flat from vacuum?

  • Mike Wetzel
    Mike Wetzel May 19, 2014

    Not sure,will have to check.But i am going to go and get the hard plastic line today.It was on there for a reason.i meationed it from the start because i was'nt sure if it could have been the problem or not.will find out and let you know.Thanks

  • Jeff Youtsey
    Jeff Youtsey May 20, 2014

    So it was vacuum related after all! Hope i helped!

  • Mike Wetzel
    Mike Wetzel May 20, 2014

    yes sir it was and you were a great help.i just went out there and traced all the lines and found that one hidden underneath.put it back on and fixed the problem.Thanks alot.Such a simple fix.

  • Jeff Youtsey
    Jeff Youtsey May 20, 2014

    Well you are very welcome sir! and let me know if any more problems acure


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SOURCE: 1996 s10 2.2 engine starts but idles rough and will not rev up.

Hi! You must be frustrated by now! your code is marking that the O2 sensor is bad in bank 1. Did you replace the O2 sensor that is located  before the catalytic converter?  The S10 has an O2 sensor specially made for that cat. its about 30$ That would explain for your blackened spark plugs; your pc on the car is asking for more fuel. GOOD LUCK!!

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SOURCE: in my 1997 Chevy Lumina 3.1L the CHECK ENGINE SOON light is on

If it was a stock rebuild the original PCM settings should be fine check all the fuses and wiring possibly something was damaged or left loose this stuff happens to the best of the SES light needs to be reset with a scan tool make sure to record all codes stored in the computer as this will aid in diagnosing any problems. the car must be ran thru a drive cycle usually normal driving conditions of say a mix of city and highway driving until the PCM relearns all parameters like o2 sensors emissions sensors ect... this can also be checked with the scan tool in the readiness moniters these monitors will be reset every time the SES light is reset. when pumping the gas pedal 3 time you are just resetting the maintenance light.

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SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec

Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?

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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?

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SOURCE: 1990 chevy lumina, idling problem... to rich.... stalling......

check egr valve for vacuum leak. pull hose from manifold. put hose in your mouth like a straw and **** on it. if the valve moves, then it's good. if it doesn't, you need a new egr valve. WARNING, they are fricking expensive! auto zone price $204. NO JOKE

Posted on May 14, 2010

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