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Thread: Help car jerks once at 2300 rpm.

  1. #1
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    Help car jerks once at 2300 rpm.

    Today while I was driving I noticed that my car would jerk once when I was accelerating. It always jerks right at 2300 rpm or so and after that it would be fine. Just one small jolt. It will also jerk/jump when in neutral. Its a manual car so i dont think its the clutch and transmission or is it the clutch thats causing it? Also just yesterday my car overheated cause the hose to the idle control broke. I think it was the oem hose too... But anyways it overheated. Could that of damaged the spark plugs? But like other than the small jerk everything else is mostly fine. I replaced the hose already and it runs cool again. But that small jerk is annoying.



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    Dr_Snooz's Avatar
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    Re: Help car jerks once at 2300 rpm.

    Vid of issue? You mention an idle control, so I assume this is a fuel injected car? Is it when you're accelerating aggressively, or just puttering along? If you hold it at 2300 what happens?
    Dr_Snooz

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    Re: Help car jerks once at 2300 rpm.

    Yes it is a fuel injected car. Just whenever it gets to that specific rpm it jumps up a bit then returns to a normal climb. On second thought could it be the egr opening? Because before it would only do that on cold starts lasted less then a minute and when it was warm it would go away. ill try to get it on video.

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    Re: Help car jerks once at 2300 rpm.

    Ok it just Fixed it self. The jump went away for now. Thanks

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    Re: Help car jerks once at 2300 rpm.

    I missed the overheat part. Make sure coolant is full and you bleed it using the bleeder on the thermostat housing. You may also have to release air trapped in the IACV buy loosening the coolant line.
    1988 Lxi owner since August 1995
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    Re: Help car jerks once at 2300 rpm.

    I think its an ecu problem? It comes back sometimes and ill just have to turn my car off and back on and it'll go away... Also how do I bleed it? Like which hose do I release cause there's 2 but they are both below the idle control.

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    Re: Help car jerks once at 2300 rpm.

    Could that also be why my car has a really crap idle?

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    Re: Help car jerks once at 2300 rpm.

    [QUOTE=frastydragon;1220878]Could that also be why my car has a really crap idle?[/


    There is a bleeder screw on the thermostat housing and its in the manual how to properly bleed it.

    The IACV i just loosen the clamps and when you start to wiggle the hoses off youll start hearing air escape. Needle nose pliers helps on the hose not the nipples of the IACV.
    1988 Lxi owner since August 1995
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    Re: Help car jerks once at 2300 rpm.

    Here is it acting up. Happens like 5-10% of the time. I use it to deliver food. Everytime it acts up i have to shut the engine off and turn it back on and it'll go away. Its a manu. At 1st gear there is a big jerk/jump. At 2nd gear there is a smaller one. And 3rd is lesser. Haven't tried 4th or 5th yet. I can't really hold the rpm stable at 1st and 2nd. At 3 when I held it, it would be stumbling. Acting like there's no spark? Or is it no fuel? Timing problem? Idek anymore.

    Here in the video the beginning is at 2nd gear. You can't really notice the camera shake but it jumps a few times when I get to the 2300ish rpm. Near the end you'll see me hold it at 3rd gear and it just shudders until I give it more gas and it'll pass the trap point.





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    Re: Help car jerks once at 2300 rpm.

    Ok first thing is take the distributor cap off,rotor button and the dust shield and see what the inside of the distributor looks like. I kinda suspect the vacuum advance is messed up in there. Look inside the cap at the posts and look the rotor over as well. You can leave the wires on the cap or mark them well when you remove them.

    The other things you could try is new NGK plain spark plugs and a new fuel filter.

    I dont really like the knocking noise its making when it doing it
    1988 Lxi owner since August 1995
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  11. #11


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    Re: Help car jerks once at 2300 rpm.

    Another simple idea is when your cruising steady wiggle the ignition key and see if it does it. The ignition switch contacts may have worn out have worn.

    Does it only do it at night?
    1988 Lxi owner since August 1995
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    Re: Help car jerks once at 2300 rpm.

    Clearly, your car is haunted. Are you getting a CEL? I'd be looking for a bad sensor myself, but I can't say what's going on exactly.
    Dr_Snooz

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    Re: Help car jerks once at 2300 rpm.

    Hello, I am new here...
    Definitely wonít be part of the solution but I am on the same boat with you OP. I have a 1989 Se-i and as Iím driving, it jumps at 2k or 2.2k rpm. Mostly on 1,2,3 and 4. Havenít really noticed or tried to look at it on last year but yes it does happen. Both day and night. I was thinking it could be a misfire but Iím not very educated when it comes to automotive mechanics.

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    Re: Help car jerks once at 2300 rpm.

    Ill have to try that ignition wiggle. It happens anytime of the day. Whenever it wants to act up. And I havent had a CEL. But I know I should be having one. Where is it anyways?

    I feel like it's the spark cutting out to make it jump. Only explanation I can think of. Some maybe something wrong with the advance? Idk

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    Re: Help car jerks once at 2300 rpm.

    https://www.3geez.com/forum/newreply...1397&noquote=1

    the ECU is under the drivers seat.
    1988 Lxi owner since August 1995
    336k miles running strong!
    Now running E85.

    My Acura Type R front brake thread

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