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Thread: Idle AFR changing whilst Idling

  1. #31
    Fuel Injected!
    Join Date
    Mar 2013
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    323
    Here are some good articles.
    Attached Files Attached Files

  2. #32
    Fuel Injected! Terminal_Crazy's Avatar
    Join Date
    Oct 2015
    Location
    Lancashire England
    Posts
    160
    Thanks for those.
    I’ve got a couple of Greg’s books.

    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  3. #33
    Fuel Injected! Terminal_Crazy's Avatar
    Join Date
    Oct 2015
    Location
    Lancashire England
    Posts
    160
    Little update on this issue.

    Removed plugs from motor and they were oily/carbonized and sooty.

    Checked the PVC valve and had tape stuck over the end where I'd tried to fatten the valve into the grommet.
    Replaced valve anyway

    Bought a cheap Endoscope off ebay but couldn't get a clear view of the cylinders.
    Tried viewing into the inlet manifold port runners and again couldn't really see any definitive detail.

    Made a smoke machine with a stainless chamber & a small compressor
    Pumped several smoke pellets into the crankcase through the rocker cover.
    had smoke forcing its way out of the dipstick hole
    I could NOT see any smoke in the manifold runners which I suppose is good in a way.
    Certainly ticks the box the manifold is sealing.

    Resealed the AIR tube plugs in the exhaust manifolds with epoxy metal and replaced.

    Started the car and the RHS O2 started to drop after a minute or two.
    Vacuum gauge was pretty stable.
    Tailpipes were smoking white quite a lot, it's freezing and snowing here.
    So I let it warm up and did a water decoke into the inlet manifold.
    Used about 1.5 pints over several minutes.
    The O2's and wideband all flatlined.
    Retarded the timing with EEHack (Thanks Steveo) to pump heat into the exhausts.

    After another 5 minutes or so the O2's came back on line
    Wideband followed suit.
    The smoke has cleared up from the tailpipe.
    The smoke from the rear of the inlet manifold also had cleared up so PCV seems to be working now.

    Car is idling pretty sweet.
    The RH O2 sensor is now consistanly reading higher than the left as i'd fattened it up slightly which it has never done before
    and the wideband reading was also more stable around 12.5

    I'm just waiting for new O2 sensors and plugs to arrive.
    I will monitor this for a while before changing anything over and see what develops.


    Thanks guys
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

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