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Thread: idle ok light throttle ok wide throttle Bad

  1. 13th April 2014, 08:37 PM #11
    Jazzman
    Jazzman is offline Wizard Silver Subscriber
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    Changing the water temp sensor with one out of the 1986 model i have made a noticeable difference, it is more driveable now. But it still is not right, i can't put load on the engine.

    It has got to be injectors.

    What goes wrong with injectors anyway? I had mine out, cleaned the bottom of them and changed the top and bottom seals.

    It is just so weird that it idles fine, at 900rpm i might add, i can't slow it down because the idle screw on the plenum is in all the way. I can rev it up pretty easy and wide throttle in neutral but as soon as i drive it i have no throttle response, power or smooth reving.

    I noticed when driving, if i have the throttle open wide to full the engine starts to respond poorly if i back off the throttle a little the revs pick up smoother.

    It better be injectors because i'm rapidly running out of time.
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  2. 13th April 2014, 08:52 PM #12
    Jazzman
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    These look exactly like the ones i have. I didn't realise the hose was fixed to the injectors. That would explain why it was so hard to remove and replace with standard fuel hose.

    6X NEW Standard USA Holden Commodore VL Turbo RB30ET Fuel Injector | eBay
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  3. 15th April 2014, 10:45 AM #13
    Jazzman
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    Replaced the injectors with the ones from the 1986 classic. The engine ran perfect once i changed the mixture in the FLAPPER back to were it was before i started playing with it.

    I check my bed injectors by putting WD40 in them, powering them up and blowing air through them with my mouth. The WD40 dripped out. I tried the same thing with t he injectors out the 86 and i got a stream of WD40 to come out.

    I went for a drive and it was perfect until it started to cough and splutter after about 4 Kms. I then flicked it over to Gas assuming something was wrong with the petrol system again. Then it backfired and stuffed my FLAPPER, it is slightly bent sideways now and jams.

    After removing the Flapper and running it just with the gas mixer it runs poorly, this is the first time it has run poorly on gas. I'm assuming i have a vacuum leak from not letting the gasket glue set properly before driving it.

    Does anyone else have any theories? Does anyone have a cheap replacement flapper or know how to repair it?
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  4. 15th April 2014, 01:47 PM #14
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    bee utey
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    A flapper can be got going again by carefully levering the flap around with a flat bladed large screwdriver until the flap runs true again. Done it a few times before I realised you never ever run a flapper without an inline anti-backfire valve. In your case even leaving the hose clamp off the air inlet hose would have helped.

    As to the running issue, it sounds a lot like ignition failure, coil, module, plug lead, dissy cap etc. Check that all the leads are securely fitted to the spark plugs and cap, the number of people I've seen that have weak-wristedly put leads half on spark plugs would fill a greyhound bus. The metal ends need to be secure on the plug terminal. Also check all the leads for continuity with a mulit meter. Having a lead disconnect can burn out a coil or dissy cap in relatively short order. Check the cap internally for carbon tracks.
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  5. 16th April 2014, 12:34 PM #15
    Jazzman
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    FIXED! For the time being anyway.

    OK... i've got no idea why it was running poorly before switching from petrol to gas. But after leaving it for a 12 hours it is running fine again on gas. The flapper is still stuffed but i put on another one (the plenum clamp on the gas mixer is not done up) and it is running on petrol and gas no worries again.

    I'm going to drive it to and from work to make sure all is good before taking it to the high country on ANZAC day weekend.

    Thanks for all your advice people.

    Bee Utey i checked the ignition system and spark plug leads as you suggested. They are all good. I'll eventually get around to upgrading the ignition module to the Bosch module. But for now it has a brand new dizzy on it from Powerspark with a Lucas module and Lucas coil.
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