blm was 127-128 but after new valve stems its 119-120 [Archive]

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1500chevy5.7l

07-07-2007, 10:05 AM

ok i finially did all the rest of my valve stem seals becuase the puff of smoke at startup was not cool...but before the swap my blms after a bunch of tuning from me and brain at tbi chips we got it running great at 127-128 at idel and on up till PE were it loocked at 128 and he adjusted from there....now after the valve stem seasl my blms at idel are 119-120 and at PE there 126 what went wrong here?....when i did the valve lash i did like most recomened i used a old valve cover drilled holes in itand then staryted the motor i did one at a time lossing them till the "clatter" then slowly tighting them till it stops then 1/2 turn preload.....all was quite but performace sucks.....what happedned?

heavychevy454ss

07-07-2007, 12:15 PM

You're not burning as much oil now. The oil changes the emissions that the O2 sensor reads. Makes since to me that the tune would now be slightly off.

1500chevy5.7l

07-07-2007, 12:23 PM

1BadZ71Tahoe

07-08-2007, 06:43 PM

ok so i readjusted my valves one more time and this time i did it the way of http://www.chevyhiperformance.com/techarticles/148_0303_setting_valves_info/index.html and now idelis great agian but all the sudded at 3k my blm hits 192!!!!!! wtf.....so i am sendinf theses new logs to brain tro see what needs to be done...

Do what you can, but don't expect Brian to take too much time to do the fixes. I'd just get the equipment and start doing it yourself. I posted up a pretty almost full write up on converting to the 95+ pcm and how to tune it. You should know there's a lot of research to do, but it's well worth the reward.

- B

1500chevy5.7l

07-08-2007, 07:42 PM

why would brian not take the time?...huh?.....and were is your wrtie up on that swap could you post the link please....