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Thread: Ignition timing & idle

  1. #11
    Join Date
    Mar 2008
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    Kilmore, VIC
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    I'd be checking that the timing marks are still accurate on the harmonic. I've had a couple that have moved considerably and they tend to move in the retard direction. Also check the harmonic isn't loose on the shaft. These engines aren't overly sensitive to timing really. I had my stock 3.9 LC locked at 15deg (ie 15 deg static and no advance) for a couple of years before fixing the distributor. Barely noticed a difference after fixing it... My v.high comp stroker is much more sensitive to timing, but the lower comp stockies just don't really care that much (as long as you are in the ballpark, within reason). And that little cam still counts as basically "stock" in my book... If you need that sort of static timing then there's a problem somewhere.
    DiscoClax
    '94 D1 3dr Aegean Blue - 300ci stroker RV8, 4HP24 & Compushift, usual bar-work, various APT gear, 235/85 M/Ts, 3deg arms, Detroit lockers, $$$$, etc.
    '08 RRS TDV8 Rimini Red - 285/60R18 Falken AT3Ws, Rock slider-steps, APT full under-protection, Mitch Hitch, Tradesman rack, Traxide DBS, Gap IID

  2. #12
    Join Date
    May 2015
    Location
    batemans bay NSW
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    timing

    If you have raised the compression ratio, you will need to have your distributor re-calibrated. Engine will be underpowered at low revs, and have too much advance at higher revs. That is why you find that it regains it's power when you advance the timing. Does it vibrate badly at high revs?

  3. #13
    Join Date
    May 2019
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    Italia
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    the engine at high speed does not vibrate. if I keep the advance below 19 ° I have the power at high revs from 2500-3000 onwards, at low revs I have no power. when the engine was rebuilt, the heads were leveled and normal pistons were placed. Can it have increased so much compression to cause these problems? I have to clean my distributor because it is full of old and hardened grease ... for the moment I lubricated it with the wd40

  4. #14
    Join Date
    Oct 2011
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    Sunshine Coast
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    A poorly operating distributor can cause havoc with engine performance. It’s as critical to get correct as rest of engine. If you have to useWD40 to sort of keep it going - then I’d be giving it to an distributor specialist for rebuild if you didn’t want to do that yourself. To have it at 19 degrees says it’s not advancing correctly.

  5. #15
    Join Date
    Mar 2008
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    Bellarine Peninsula, Brackistan
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    If its full of hard grease the weights on the centrifugal advance mechanism won't be able to move............. hence the 19 static degree advance.

    If it is really bad the vac advance might be somewhat inhibited as well.

    Clean it up and enjoy life.

    DL

  6. #16
    Join Date
    Mar 2017
    Location
    Tamworth NSW
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    Unstable idle speed.

    Quote Originally Posted by Matteo1991 View Post
    Hi everyone, I have a range rgover classic with 3.9 v8 rebuilt with a kent cam h 180 ... new oem stepper motor and I have no air leaks in the plenum chamber, rover pressure gauge has no fault code, my problem is in the gear shift, when the clutch is released with little gas the engine accelerates revolutions per minute 1200-1500, or stopping at an intersection before descending to 700 rpm takes about 3 seconds. I have setting the idle but i have a small difference... i have setting high timing ignotion 19° i think is the causes.... whow do you think?
    Matteo,
    I agree that sticking advance weights/ dry hard gease in the shaft will cause this. I worked at a country Land Rover dealer for 12 years and this problem often arose. One of the causes was caused by people wriggling the multi pin connectors to the air flow meter etc.when they were un-plugging things. This wriggling often opened up the female pin sockets causing intermittent/poor connections. This caused lots of head scratching for us. One day, I had a customer with a 3.9 Disco with this problem and I as I moved the airflow meter connection the idle suddenly behaved normally. When we separated the connector, some of the pin sockets had wider slots than the others. We tightened them up with a fine jewellers screwdriver until all the pins and sockets looked even and straight and all was well! The owner addmitted pulling some of the connections apart looking for water after a wet 4WD trip. I always checked them after that and advised home mechanics to pull all electrical conectors apart without twisting or wriggling them. A simple fix if this is the problem.
    Good luck!
    5380.

  7. #17
    Join Date
    May 2019
    Location
    Italia
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    hello guys, I cleaned every part of the distributor, I removed all the grease and I lubricated the rotating masses with oil ... I reassembled the distributor and now the tdc moves alone from advance to delay from the pointer illuminating it with the strobe gun

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