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July 4th, 2006, 03:24 AM
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#1 |
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Regular
Join Date: Jun 2006
Location: san antonio texas
Posts: 124
 iTrader: 0 reviews
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big time tapping
i just got done rebuilding the top end of my 94 gt. everything went pretty smoothly. on the advice from a friend, i filled up with 89 octane instead of 93(which i've been running for years). now i dont know if this is a coincident or not but now i hear a loud rapping noise from under my left valve cover....i know the type of gas wont affect my lifters,but if anyone has any ideas, i would like to hear them....thx
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July 4th, 2006, 10:01 AM
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#2 |
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Newbie
Join Date: Jun 2006
Posts: 11
iTrader: 0 reviews
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You sure its coming from under your valve cover? Check to make sure your Header gasket isnt leaking. I had that problem when I did mine and thought oh man what have I done! lol Check that first!
Mark |
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July 4th, 2006, 04:14 PM
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#3 |
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MM Fanatic
1999 Ford Mustang V6
Join Date: Sep 2005
Location: newport news, va
Posts: 3,745
iTrader: 0 reviews
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when you say top end rebuild what all was done?
__________________
...even fire and single cammin 1986 Ford F-150 5.0L 2WD 1994 Toyota Pickup 2.4L 4WD 1999 Ford Mustang 3.8L V6 2002 Jeep Grand Cherokee 4.0L 2WD 2008 GMC Sierra Denali 6.2L AWD |
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July 4th, 2006, 04:15 PM
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#4 |
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RLY SRS
 
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Have you tried putting 93 back in the car? If so did it go away?
It would be alot easier if there was a sound clip... |
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July 4th, 2006, 06:25 PM
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#5 |
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Regular
Join Date: Jun 2006
Location: san antonio texas
Posts: 124
iTrader: 0 reviews
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i put a new lower intake, upper intake, of course all new gaskets, 1/2 inch plenum spacer, new fuel rails, new injectors. i will check for loose header bolts and hope thats what it is.
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July 4th, 2006, 06:26 PM
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#6 |
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Regular
Join Date: Jun 2006
Location: san antonio texas
Posts: 124
iTrader: 0 reviews
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the header gaskets are copper but i guess there still not immune to leaking
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July 5th, 2006, 04:03 AM
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#7 |
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Newbie
Join Date: Apr 2006
Posts: 14
iTrader: 0 reviews
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Copper gaskets can leak if not properly tightened. They will also leak if they do not match the header or head. Make sure that you have square port gaskets and headers to match your heads.
Some other things to look for... Did you use adjustable rockers or bolt downs? If adj, then re-adj. If bolt down rockers were used, then you may have a lifter or two not pumping up oil to the rockers. Its hard to tell without being there to hear it. Usually when I here tapping, I know to shut my engine off. At 8k rpms, anything and everything can break. Also if you are using adj rockers, make sure one isnt rubbing on the valve cover baffle on that side. If it was me, I would take that valve cover off and look for anything obvious. If you don't see anything obvious, start the car up with the valve cover off to see something then...just my two sense. |
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July 5th, 2006, 01:55 PM
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#8 |
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Regular
Join Date: Jun 2006
Location: san antonio texas
Posts: 124
iTrader: 0 reviews
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go figure
#8 spark plug boot came off a liitlle causing an arc to the block.....duh....
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