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Back fireing and power loss

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    Back fireing and power loss

    Hello, I have a 1991 e30, I was having idle issues a few weeks ago, I ended up switching the idle control valve, did not fix the issues, my idles were at 3k on neutral, I ended up purchasing a used afm, that put my idles back to normal,
    But a few days ago, I have been noticing allot of backfiring when I come from a high rpm like 3rd to neutral the exhaust pops and rumble, or if I am going down a hill on 2nd its popping,
    I have switched the afm twice, all the plugs, wires look intact and not brittle, I also noticed that when I jump on the freeway the car seems as it wants to go faster on take off but I feel a slight hesitation, could it be a bad injector? thank you all in advance.

    #2
    What symptoms would a vac leak show?

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      #3
      I tried the search option, but alot of the finds are for swaps, mine is stock.
      Last edited by ezlnh8u; 08-21-2014, 09:08 AM.

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        #4
        Ok. anyone have a clue, what this could be, at high rpm going down a hill, the car back fires really bad, on the highway it drives smooth, I cant figure this out, I just ordered fuel injectors hoping that could be it, not sure if it can be the o2 sensor.

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