Quote:
Originally Posted by Hib Halverson
Reading this thread again, got me thinking...
As a rule, I agree with Marc Haibeck on most significant issues relating to LT5 performance/drivability, but on the Secondary Port Throttle vacuum system, if Marc feels that as long as the auxiliary vacuum pump will shut off for a second or so, the port throttles will work properly, I disagree.
....snip...
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Bingo. You can now give yourself the "beacon of reality" award
I have voice this opposing view in the past also. Along with what Hib mentions about ability to hold the secondaries in, to me a 1sec cycle time is both an indication of a worsening issue AND
ages the crap out of the pump (key on motor off)
Hib, conventional thinking in the 90s was that 10sec was the limit as to "better fix it" but 15 is good also. I keep mine at 30sec. When it goes below that I investigate. That way I don't find myself piss-whine and moaning about secondary failures.
PS it is less fashionable nowadays to "disagree" on the forum but
I think done correctly it's just fine.