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Thread: V8 low rec splutter and idle stall- help!

  1. #1
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    V8 low rec splutter and idle stall- help!

    I was doing some work on the extractors on my 3.9V8 and removed two of the spark leads that were in my way. In a rush to pack up I forgot to reconnect them.
    Driving the car, quickly realised something wasn't right , car was spluttering under acceleration, remembered the leads, pulled over connected them.
    Now the car is sounding rough, stalls at idle and needs lots of revs to set off, without stalling/spluttering.
    Checked all the leads and seem okay, my next though is spark plugs on the two cylinders I forgot to connect. Does this sound right or am I looking in the wrong place?
    Heading over to straddie camping for Easter and away with work Monday to Thursday so really don't have much time to sort it.
    Any help appreciated!

    Dave

  2. #2
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    Have you forgotten to plug in the MAF (air flow meter)? Remove the two plugs where the wires were off, see if they are fouled, also check your firing order to see if the leads are connected properly. Check inside the dissy cap for carbon tracking.

  3. #3
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    I checked the dizzy cap and it was a decent ammount of white powder build up, scraped it off and it just crumbled. Tried to start it after that and wouldnt even fire. Replaced the cap an back to where I was with the lumpy idle and struggling under load rpm.
    Looks like I am along the right track with the plugs. Hopefully that sorts it.
    If not I will be back!

  4. #4
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    Of course it's also possible your ignition amp or coil have died with the extra voltage that happens with disconnected leads. I have replaced many LR originals for the Bosch BIM024 module and matching coil. Lucas disease.

    Thread here:

    Lucas ignition amplifier replacement by Bosch 024

  5. #5
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    Quote Originally Posted by bee utey View Post
    Of course it's also possible your ignition amp or coil have died with the extra voltage that happens with disconnected leads. I have replaced many LR originals for the Bosch BIM024 module and matching coil. Lucas disease.

    Thread here:

    Lucas ignition amplifier replacement by Bosch 024
    Thanks bee utey, if the new plugs don't solve it that will be the next thing I check. (although it did give me a good shock when I decided to check the lead to the dizzy was plugged in properly so there must be some decent voltage there)

  6. #6
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    The car was running better with the new plugs but then started getting worse again (Setting off with anything less than high revs casued the engine to splutter and stall) and is now not starting at all.

    I dropped it in at the mechanics to get new susp bushes and ball joints and now he cant get it going. It has spark, fuel pressure, pulse. Could firing order be the issue? I googled it and 1-8-4-3-6-5-7-2 seems to be what it should be. Is this always the case? I think the motor is out of a RRC but am not 100% certain. If there a way to ascertain what the firing order should be or is it something that always needs to be looked up?

    I checked it out before i took it in and it already has a bosch module.

    Thanks for the help.

    Dave

  7. #7
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    It may have a bosch module. It may have spark. It may give a good shock.
    But how many volts is in that good shock. You want about 30,000 volts. So that spark needs to jump about 25mm.
    As Bee utey said coil or module (even bosch are not indistructable ). With leads flapping in the breeze and it should easily carry 30,000 volts across a plug gap or 25mm. How many volts would have built up to find a ground..... And where?????
    So grab a spark tester and see if it can.

    You have all symtoms of a failed ignition system. Improvement on new plugs (but not fixed). Failing under load. Hard start.



    HTH

  8. #8
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    Thanks for that, I have passed the info onto the mech. I dont think it is helping that I have the aftermarket Wolf3D ecu confusing things!
    Hopefully it is back on the road soon!

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