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Help! Loud tick / pop only when #1 cylinder fires...

This is a discussion on Help! Loud tick / pop only when #1 cylinder fires... within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by bdub2145 i had a broken spring on an 02 firehawk of my buddies and it missed bad ...

  1. #21
    1000+ HP member SteveZ28's Avatar
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    Quote Originally Posted by bdub2145 View Post
    i had a broken spring on an 02 firehawk of my buddies and it missed bad and backfired . doesn't really sound like a broken spring but maybe. if you pull the plug wire at the coil it should arc out of the coil if it is firing..

    I had a broken spring on a different motor, it would barely run. Much different symptoms and noise than I have now... and wouldn't a broken spring get louder with RPMs? My nose actually goes away with higher rpms, which is why I feel like it is electrical rather than mechanical.

    The plug wire does arc to the coil if I pull it out.

  2. #22
    Smiles for 9.5 Years cammed goat's Avatar
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    I am thinking it's an exhaust leak from that description.

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    Quote Originally Posted by cammed goat View Post
    I am thinking it's an exhaust leak from that description.
    Even if it doesn't get louder with RPMs?

  4. #24
    Smiles for 9.5 Years cammed goat's Avatar
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    Do you have the AIR line on your headers?

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    Quote Originally Posted by cammed goat View Post
    Do you have the AIR line on your headers?
    No I don't... race headers. However, I did remove most of the PCV and valve cover air circulation.

    I kept a breather on the drivers side valve cover and I have the crank case vent to passenger valve cover tube still connect. The rest has been removed - including the valve cover to valve cover tube.

  6. #26
    Smiles for 9.5 Years cammed goat's Avatar
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    Have you listened to the car from underneath while the car is running?

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    Quote Originally Posted by cammed goat View Post
    Have you listened to the car from underneath while the car is running?
    No I haven't yet... should have. Will do once things are put back together. I'm replacing the port seals on the FAST 92, they don't seem to fit very well after a couple intake pulls.

  8. #28
    Smiles for 9.5 Years cammed goat's Avatar
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    OK.

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    1000+ HP member SteveZ28's Avatar
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    Quote Originally Posted by cammed goat View Post
    OK. When you pulled the plug on cylinder #1, were there any shavings on the plug? Like as if the threads had pulled out of the head? Also, check the harness to the coil on cylinder #1 to see if there is sufficient current going to that coil. There could be a chafed wire somewhere.
    If this is the case, I should be able to diagnose by switch the coil bracket packs between sides, correct (they are reversible, right...?)? So with my problem currently being on the #1 cylinder if I swap sides the problem should then be on the #8 cylinder?

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    yes they can go on either side . and it will switch if its in the packs . and its definetly not a lifter ?

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    Quote Originally Posted by bdub2145 View Post
    yes they can go on either side . and it will switch if its in the packs . and its definetly not a lifter ?
    Will lifter noise diminish significantly, if not disappear, if the cylinder is not firing (as opposed to when it is firing)?

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    Quote Originally Posted by cammed goat View Post
    Have you listened to the car from underneath while the car is running?
    Got the top end put back together last night. Put in new intake port seals and swap coil packs & brackets. Noise was still there... so I listened from below.

    The noise really seems to be originated from under the intake manifold by the #1 cylinder - where the lifters are. Any way to diagnose lifter issues without pulling the head?

  13. #33
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    that sounds like an exhaust leak on that cylinder, I assume you have headers? Lifter noise whould not go away when you pull the plug wire.

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    See OP? I'm not the only one who thinks you have an exhaust leak.

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    Quote Originally Posted by cammed goat View Post
    See OP? I'm not the only one who thinks you have an exhaust leak.
    Lol, well, I'd be very happy if that was the answer. I guess I can go through and loosen then re-tighten the driver side header bolts. But wouldn't an exhaust leak get louder with rpms? That doesn't happen with me.

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    I think it depends on the size of the leak that determines whether the leak gets louder with RPMs.

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    Yes the more load on the motor the louder an exhaust leak will be...

    I have heard fuel injectors tick before. Longshot I know Maybe you just can't hear it in the upper rpm's....

    Same with the lifter tick...maybe you just thinks it goes away at upper rpm. Have you revved it while your head is under the hood to verify this???? My car is so loud I can't hear shit over 2.5k under load.....

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    a lifter will get quieter with engine rpm because the oil pressure goes up significantly . from everything you say it does not sound like an exhaust leak because an exhaust leak would get louder with rpm and not go away. if you can take it to a local machine shop and get there advice or a mechanic so they can here it they could probably give you the correct diagnosis. sounds are hard to diag by discription because everyones version of a bnoise is different. but it sounds like a weak lifter to me .

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    Well, I took off the driver's side header, gasket had separated a little but I don't know if it was already that way or whether pulling off the header did it. There might have been a little black around the top of the #1 cylinder, hard to tell whether it was from exhaust or remains from the gasket. So new header gaskets are on the way and will hopefully be installed by Friday. The saga continues... if that doesn't fix it I'm thinking lifter... so then the question will be whether I pull the head myself. Hoping it doesn't come to that.

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    pulling the head yourself would be cheaper if you have the tools and the knowhow . it's not that bad of a job . if you know how to pull the intake and header then you are almost there . just follow the torque specs when you are putting it back together and you shouldnt have a problem at all man .and if you need help i have alldata at my shop so i could send you some of the procedures if need be..

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