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Rough Idle Problem?

Discussion in 'General Tech and Maintenance' started by loneranger, May 27, 2003.

  1. loneranger

    loneranger Junior Member

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    I had this "Rough Idling" problem over a year and gone through so many mechanics trying to fix it. The problem started with my "Dinan" chips burned out, then igition core and chip burned out too and then the catylic converter. All these problems made the idling worse.

    Now all parts are replaced: distr. cap/components
    sparke plugs wire
    Mugen chip/motherboard
    Major tune-up
    Stock engine - 1992 Honda Civic Si (1.6 liter)

    I don't know why it's still rough idling at 700 rpm? It's the IAC/TPS/FIT or what?
    HELP? Any shop you can recommend in San Jose, CA.:(
     
  2. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    theres about 12 posts about fixing a rough idle

    do a search
     
  3. pills_PMD

    pills_PMD Super Moderator

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    lose the "mugen" ECU.

    what do you mean by rough?? is it surging at all?
     
  4. loneranger

    loneranger Junior Member

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    Yeah...I did the search and read through all the post. All the idling problems are concerning newer models...my is 1992. <_<

    Rough...does not surge or move up/down. The needle stays at 700 but goes down when:

    1. Switch on headlights
    2. Turn off AC

    I can feel the "Slight Shake" on the driver side through the gas pedal. The same "Shake" feeling when I put my hand on the steering wheel. I had a feeling that the TPS is incorrect when my friend install the Mugen ECU without matching the idling with the stock engine? :blink:
     
  5. pills_PMD

    pills_PMD Super Moderator

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    you must have checked the screw on the TB to bypass air??

    is the IAC valve functioning properly?

    tps... .5 volts closed... 4.5 volts at WOT
     
  6. loneranger

    loneranger Junior Member

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    thanks..guys for your input...I'll take it to DSR in San Jose, CA to check it out...they got all kinds of equimnts there!!
     
  7. importimage

    importimage Senior Member

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    All you need is a voltmeter to check for the voltage on the tps sensor. As for the IAC valve; spray intake medic into it then let it sit for a while....reinstall IAC. The car will idle really bad at first..if at all then after many start and stops it will idle mint. I would not waste your money getting a mechanic to do this.
     
  8. junhondasi

    junhondasi Member

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    can u change the rpms at idle with the mugan ecu if so add like 200rpms and take it for a test drive other wise it might just be the alt and or battery B)
     
  9. pills_PMD

    pills_PMD Super Moderator

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    mugen does not and has never produced a tunable ecu.
     
  10. loneranger

    loneranger Junior Member

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    OH...I wish I can do this myself...when it's come to IACV or tps, I have no clue. When I have the $$$, I'll switch to a Hondata ecu. :)
     
  11. pills_PMD

    pills_PMD Super Moderator

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    so did you check the voltage on the tps? or no??
     
  12. loneranger

    loneranger Junior Member

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    no...i don't know how..man... :unsure:
     
  13. pills_PMD

    pills_PMD Super Moderator

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  14. loneranger

    loneranger Junior Member

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    thanks...pills_PMD :rolleyes:
     
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