Rpms going as low as zero when idling.

Discussion in 'OT Driven' started by forgotmyname, Oct 26, 2009.

  1. forgotmyname

    forgotmyname Active Member

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    This happens after I start driving the car. After a few blocks, the rpm needle goes as low as 0, and the car behaves like a trembling granny.

    However, the car has no acceleration problems or anything like that.

    Car is 99 Civic LX. What do you think it might be wrong.
     
  2. Priest Tango

    Priest Tango Custom User Tits

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    well if it accelerates fine then that rules out fuel filter
     
  3. deusexaethera

    deusexaethera OT Supporter

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    Crappy ignition is my guess. It'll run on the wrong amount of air, it'll run on the wrong amount of fuel, but it won't run with the wrong amount of spark. A lot of ignition-related components won't work so well once they heat up if they're old or damaged.

    But, since your car was made after 1996, you have an OBD2 port that you can connect a code reader to. Might want to get a cheap one and see if it reports any problems.
     
  4. Figori

    Figori Taking BRC to the EXTREME. OT Supporter

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    Or go to an Auto Parts store (ie: AutoZone, Advanced Auto Parts) and have them read if for you for free?

    And it sounds like a rotor/distributor problem. I know the 4th Gen Civic's were plagued with issues with the Rotor, but not sure about the 6th Gens.
     
  5. ldaggerl

    ldaggerl New Member

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    Yes if its got a code get it read. If it doesn't then I suggest you take a look at your idle air sensor. I'm not sure what yours has to control the engine at idle but I know on many other vehicles there is a sensor that controls the engine while at idle.
     
  6. deusexaethera

    deusexaethera OT Supporter

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    Some places in some states won't read codes for free anymore. Anyway, having a code reader at your house is very convenient in situations where the car won't start at all.
     
  7. forgotmyname

    forgotmyname Active Member

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    I've read around and it could be solved by finding the Idle Control and adjusting it with a screwdriver or it could also be dying spark plugs.
     
  8. forgotmyname

    forgotmyname Active Member

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    Well today when I started it, it was doing this rubber grinding noise, like the one the car does when it warns you that you need to change the timing belt. Problem is I already changed them like two years ago.

    The weird thing is that it happens when I push the car after 2rpms. While idling the car sounds perfectly normal.

    What could it be?

    Brakes? I haven't changed them yet.
     
  9. jim1234664

    jim1234664 New Member

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    iacv or whatever the honda equiv is
     
  10. art_VW_shark

    art_VW_shark OT Supporter

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    zero rpm=engine cutoff. so its going low, but the gauge isn't accurate at that point. fuel pump issues?
     
  11. Priest Tango

    Priest Tango Custom User Tits

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    not going past 2k could be fuel filter / pump or maybe maf
     
  12. deusexaethera

    deusexaethera OT Supporter

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    The timing belt wouldn't slip only when the engine is hot, and even if it did slip the engine would run like shit under all conditions afterwards. It's possible you have something else that's binding up when it gets hot, though. How do the other belts look? I don't know Hondas very well; are there any moving rubber parts that could be jamming up when they get hot? Maybe a frozen A/C compressor or something that's making a belt drag really badly?

    It doesn't really sound like an idle-control problem at this point, if it won't rev past 2000rpms, because he's got to be stepping on the gas to get it to rev even that high. Or am I misunderstanding the significance of the 2000rpm comment?
     
  13. Bugalu

    Bugalu OT Supporter

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    timing belts warn you? :rofl::rofl::rofl:
     
  14. forgotmyname

    forgotmyname Active Member

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    It warns you by the grinding noise. :hsugh:
     
  15. forgotmyname

    forgotmyname Active Member

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    Well, today I took it for a drive and it started slipping when I started it, then it calmed itself. Then I drove it around town and the noise started dying almost to nothing. I am beginning to think it was doing that because it has been raining for two days here in CT.

    As far as the rpm comment. The rpm needle goes near zero but no exactly zero. The car trembles a bit when it is stopped, but has no problem with acceleration. I can shift beyond 2krpms without any problems. As a matter of fact, I shifted at 4rpms just to see if it would give me something else, but nothing.

    I am guessing spark plugs need to be changed and I need to adjust the idling control.

    Also the belts look in good shape. No cracks nor visible damage at all. Like I said, I changed the timing belts two years ago and they only have like 15k miles.
     
  16. crontab

    crontab (uid = 0)

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    clean your idle air control valve
     
  17. forgotmyname

    forgotmyname Active Member

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    Update: I sprayed some carb cleaner on the iac valve and it idles better now.
     
  18. deusexaethera

    deusexaethera OT Supporter

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    Huh. I wouldn't have thought the IAC would affect RPMs that much, but...well, I've never owned a Civic.

    I gotta remember this in case my brother's Civic ever starts acting up.
     
  19. Priest Tango

    Priest Tango Custom User Tits

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    idle air control valve. car is not idling
     
  20. 4W4K3

    4W4K3 New Member

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    When my idle went to shit it turned out to be my distributor was leaking internally and there was oil all over the contacts. Cleaned it up, rebuilt the distributor, and it's back to purring at 800RPMs.

    IAC being dirty enough to cause your car to stumble would be a first for me, but I've never owned a Civic either. Seen it on Ford Explorer's a lot in the shop.
     
  21. Boosted98gsx

    Boosted98gsx Active Member

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    also, check for vacuum leaks, and do a compression check.
     
  22. deusexaethera

    deusexaethera OT Supporter

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    Yeah, I got that, but then he also said it wouldn't rev past 2000rpm, which the IAC shouldn't have any effect on.
     
  23. DaMonsta

    DaMonsta Turnin' whores to carivores, they can't leave my m OT Supporter

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    yeah I had a '92 Accord that did the exact same thing. Come to a stop sign, and it would just turn off. New ignition fixed it.
     
  24. forgotmyname

    forgotmyname Active Member

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    Well to be honest I don't know what could be wrong with the car.

    I sprayed some more carb cleaner on the opening to the IAC valve and the car revs better when stopped.

    Also, my car was doing a deep sound (like if it had a custom exhaust) but it is the stock one.

    Now, it is sounding completely normal.
     
  25. Bugalu

    Bugalu OT Supporter

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    :rofl::rofl::rofl:
     

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