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We Gone · 10-11-2013

Mark,

Check the numbers on the prom, the 90's had a change to fix idle issues. Marc's site lists them.

" The performance calibration AYBKG is based on GM's latest release of the calibration for '90 LT5 engines. GM calibration AYBK was released as a service part via Product Service Bulletin 476503, dated February, 1994. It was released to address problems with idle fluctuation after a hot restart, increase in idle speed after a hot restart and excessive engine speed during coast down to a stop with the clutch disengaged."

http://zr1specialist.com/HAT%20Web/p...librations.pdf

10-11-2013	#45
We Gone Join Date: Apr 2004 Location: Atlanta, GA Posts: 2,170	Re: 8 cams are better than four! Mark, Check the numbers on the prom, the 90's had a change to fix idle issues. Marc's site lists them. " The performance calibration AYBKG is based on GM's latest release of the calibration for '90 LT5 engines. GM calibration AYBK was released as a service part via Product Service Bulletin 476503, dated February, 1994. It was released to address problems with idle fluctuation after a hot restart, increase in idle speed after a hot restart and excessive engine speed during coast down to a stop with the clutch disengaged." http://zr1specialist.com/HAT%20Web/p...librations.pdf __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold Last edited by We Gone; 10-11-2013 at 07:35 PM.