Thread: HELP: tapping noise!

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  1. #1 HELP: tapping noise! 
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    So I swapped my AL103 side-gapped plugs with AL104s and gapped at 0.045 with no side-gap mod. Was out tuning and gotten on it on an open stretch then came to a coast and wanted to get off the freeway and pull a u-turn, once I slow down b4 exiting I heard a tapping noise. I puled over onto the shoulder of the exit ramp and popped the hood. I didn’t hear anything at that point so I blipped the throttle cable and sure enough the tapping noise I heard. It is in sync with the RPMs, meaning as the RPMs rises the tapping goes quicker. First thought was broken fl;explate but I called lysander and he said usually a broken flexplate u can hear at idle and not when u apply throttle. So I babied it to my brother-in-law a few miles down and checked around the engine bay. The tapping seemed to be coming from cyl #3 and #5.

    I pulled both plugs at 3 and 5 and they were fine. I called dubob and he suggested the possibility of a losoe rocker bolt. I opened the oil fill-neck and checked if the rocker bolts were re-useable or non-reusable, and from what I could glance at the rocker arm on the right of the opening, it seems to be a 3/8” bolt, meaning it’s the non-reusable. Now I haven’t popped the valve cover yet as its dark and I had to head home. Tomorrow after work im gonna pull the front valve cover and check if cyl #3 or #5 rocker bolts are loose. If that’s the case, what should I do as a next step? dubob was the one who did the cam swap for me, so I cant remember how to disassemble the rockers and rocker bolts

    i'll have to find the instructions i printed out about swapping and installing higher ratio rockers whe i was planning to get them installed on my own-but dubob did it for me too
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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  2. #2 Re: HELP: tapping noise! 
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    also could it be a bad lifter? again, it only starts to tap when i apply throttle. i understand theres a slight lifter tick when using aftermarket cams and stronger springs FWIW. the tap is very noticeable when gas is applied.
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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  3. #3 Re: HELP: tapping noise! 
    GXP Level Member Iron Indian's Avatar
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    Sure it ain't a rod bearing? A spun bearing will raise with RPMs too. Check your old, you may find something.

    How about a leaky header? Pacesetters ain't the best sealing out there, mayb check that too.
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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