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rpm keeps jumping..help!!

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    #1

    rpm keeps jumping..help!!

    like the title says..my rpm keeps jumping/flickering,,when i start to drive for more than 20 mins...the car doesnt react to the jumping/flickering..drives normal..no check engine light is on...and yes the check engine light works...lol...im just getting annoyed seeing it jump...i recently change the vss ...thinking that might b the problem but it didnt stop,...please help me ...!!
    Tags: None
    #2
    Sounds like you may have a vacuum leak somewhere.......
    Originally posted by deevergote
    These cars will never be the best at anything, but they're pretty damn good at everything.

    92ex CB7<-SOLD 93ex CB9shiftingshift73C10

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      #3
      how do i check to see if i have a leak?

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        #4
        make sure all of the hoses are attached to the air intake, intake manifold, etc. and that the hoses aren't cracked/split.
        Originally posted by deevergote
        These cars will never be the best at anything, but they're pretty damn good at everything.

        92ex CB7<-SOLD 93ex CB9shiftingshift73C10

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          #5
          A jumping tach is usually a sign of a failing ignitor. Once that fails, the car won't run...






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            #6
            how do i change that?....newbie here...thanks for the help guys i really appreciate it ....just asking i was searching online i seen some people said it might b the ivac is dirty...is that true

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              #7
              It's in your distributor.
              The IACV and vacuum issues would result in an erratic idle. If the tach is jumping while driving, but the engine RPM isn't changing, then it's the ignitor.






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                #8
                the car idles fine...its when im driving the rpm jump...the car doesnt buck or anything ...the rpm flickers for about 30 sec...then it goes back to normal...it does this when i start to drive hard....i have no idle issues...

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                  #9
                  Then it's your ignitor, more likely than not.

                  People see "rpm jumping" and they don't bother reading carefully enough to realize it's not an idle problem...






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                    #10
                    i will give it a shot....once again thanks for your help....

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                      #11
                      i replaced the whole distributer..old one had a leak..worked like a charm..!!

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