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HELP!!!! slow or no accel when warm

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    #1

    HELP!!!! slow or no accel when warm

    I am having a problem when i first start the car i have not accel problems but after 5 mins i will go to give it gas and it just doesnt want to move or barley moves, but then after the rpms climb to 2k it will have power again. It dries fine besides the no accel problem in first.
    Ok i really need help. i have done the following and still have the same exact problem:

    changed dizzy, wires, plugs, cap, rotor, fuel filter and removed the cat. I have also cleaned the egr, and iac.

    i have run out of what to test. i love my cb and just want her running again....

    PLEASE HELP!!!
    Tags: None
    #2
    Oxygen sensor.

    Once the car is warm, the ECU goes into closed loop mode, where it uses the o2 sensor feedback to determine how much fuel to give the engine. When the o2 sensor begins to fail, the readings are off, and the ECU will not fuel the engine properly. I bet your check engine light comes on as well, correct? (if you pull the diagnostic code, it'll probably be code 43, "fuel supply system", which means the o2 sensor 99% of the time, oddly enough.)

    Replace the o2 sensor with a Denso or NTK/NGK unit. DO NOT use a Bosch sensor, as they don't work properly.






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      #3
      Sounds to me like the dizzy needs some adjusting. I put mine on the other day and played with it a little bit until I got it back on timing and now it runs great. I had the same exact problem as you so try that first

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        #4
        "playing with it" isn't exactly the best thing to do. There is a thread by HondaFan81 that tells you the proper way to set your base ignition timing. I suggest searching for that one. But yes, having a severely retarded spark will make for a very unresponsive low end.






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          #5
          No CEL comes on. The only light that is on is my ABS light but that would have nothing to do with this. This problem occured one day and hasnt shown any improvement with a new dizzy. I thought the spark was a issue, but the O2 would make sense to. Would bad O2's not thorw any codes??

          is there a way to bypass them for testing??

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            #6
            a bad 02 sensor can still cause this issue without throwing a cel. its probably working just correctly enough to not throw the light but incorrectly enough to make it run like shit. i would replace the 02 sensor.

            MRT: http://www.cb7tuner.com/vbb/showthread.php?t=183959

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              #7
              Yeah, the o2 sensor can begin to fail but not throw a code. Mine only threw code 43 when I got the car up to about 55mph.

              The fact that it runs fine until it warms up is basically proof. As the car is warming up, it is running on pre-set fuel maps in the ECU, and not relying on o2 sensor feedback. As soon as it starts relying on the sensor feedback, the engine runs poorly.






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