MAS voltage

Discussion in 'Technical' started by beaver, Apr 28, 2018.

  1. beaver

    beaver southern zeds

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    My engine was detonating which i put down to shit fuel, it may not be the cause at all, so I've been checking engine sensors. @ 750rpm idle the mas voltage is supposed to read 1.5v,with the ignition on motor not running 0.8v. I get 1.25v @ 750-800rpm and 0.08v not running. I tested three mas's all genuine Nissan, they all read the same. I used three different programs conzult datascan dr300zx all showed the same readings, so I'm ruling out a faulty mas. Anyone else get these readings from there mas?
     
  2. brisz

    brisz Well-Known Member

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    Air leak somewhere in the intake after the MAF.
     
  3. brisz

    brisz Well-Known Member

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    I would like to withdraw this post, wtf is with the 5 minute edit/delete window ????
     
  4. beaver

    beaver southern zeds

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    Fair call, I've been looking into that today, and also into any leaks around the injector rails, fuel hoses, regulator ect.
    decided to pull the plenum and have the injectors cleaned and tested by asnew, the fuel tank had a few floaters in it when i replaced the pump some time ago, so when I changed the fuel filter after one tank of fuel I decided to cut it open to see if anything from the tank was caught in the filter, the cellulose filter material inside the cheap pos had collapsed, didn't do any thing at the timPulled the plugs to have a look for sigs of detonation nothing, only thing is there brick red because of the nulon octane booster. What I did notice was when I pulled them they were no more than hand tight, in fact I could remove two plugs without the ratchet attached. I'm sure I screwed them down(1.5 turns after contact) properly but maybe not.
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