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Thread: Poor hot idle after a timing belt replacement

  1. #31
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    2003 Mazda protoge 5

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    Aug 2019
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    Tacoma Washington
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    Actually, the P0102 is for low air flow, not voltage. The reading the scanner gave me is 7Lb/s I believe it was so above the 217g/s max. It needs to be above 0g/s and 217g/s so that is the issue?

    Anyway, went to find a JIS bit for removing the IAC valve to ensure it's clean and had to Google what JIS was, unfortunately, no one actually makes a true JIS driver or bit, though some make a combo JIS/Phillips that hold onto the bit very well so no camming out once torqued (thus stripping out the head) and is a compromise in any case, not even Vessel makes the true JIS anymore. I bought some bits that might be an improvement over what I have already to see if it bites into the screws properly aren't much.

    Glad other places like Rock Auto sells the MAF for way better than what Parts Warehouse sells them for. The Delphi model was quoted as being $400. Found some on Amazon that were as low as 26.75 or some such a price, way better.

    Anyway, took the car for a quick drive, though goofed and didn't get as long a drive in as I had intended, but the car seems to be idling a bit better? After getting off the freeway and heading ups some steep hills here in town, the idle was much smoother, though not perfect (these cars as you may well know, are not the smoothest motors when at idle, but not agricultural like an Iron Duke 4 though!). It's still misfiring, but nothing like it was and the same 3 codes that come up as generic P codes, P0102, P0103, and P0300 so far after the run. Still comes up evap incomplete and a couple of other parameters are also incomplete. Car ran smooth and was quite responsive however and ecceleration was smooth with no hesitation due to recovering from a bad misfire and so far no pre-cat codes showing, not anything else pending at this time.

  2. #32
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

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    Jun 2011
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    Quote Originally Posted by ciddyguy View Post
    Actually, the P0102 is for low air flow, not voltage. The reading the scanner gave me is 7Lb/s I believe it was so above the 217g/s max. It needs to be above 0g/s and 217g/s so that is the issue?
    I don't know how many grams it needs.

    The Diagram Dude

  3. #33
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

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    I think you've got a bad MAF and replacing it may very well clear all your codes and quite possibly stop the misfiring.

    The ECU isn't getting proper MAF data so it's just guessing and quite possibly causing the misfire.

    Check your wires and connectors going to the MAF for breaks, shorts or corrosion.
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  4. #34
    Registered Member

    2003 Mazda protoge 5

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    Aug 2019
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    Tacoma Washington
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    Quite possibly and going with either Amazon or Rock Auto will yield one at a decent to quite affordable price point, rather than upwards of $400 for a Delphi unit locally.

  5. #35
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

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    Amazon might be a better bet.

    I've been waiting three weeks now for my damn axle nuts from RockAuto.
    They were supposed to be here by Aug. 13th.

    Amazon sounds cheaper but make sure it's the right part and not a piece of crap.
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