vaccum/idle issues

[WhipmastaFlex]

first off: rebuilt motor 3500 miles, idle set at 1000rpm, 13-14in/hg vaccum, running webcams street grind

ever since i put the new cams on (3500 miles), i have had no driveability or idle problems. the past few days, my car has lost about 2-4 in/hg vaccum at normal idle. i turned the biss up a alittle (300rpm) to idle at 1250/1300rpm, and it went back to 13in/hg of vaccum, whereas before that would yield 15-16in/hg of vaccum. now my idle is all over, anywhere from 800rpm to 1500rpm. vaccum goes from fine to crap at varying stop lights. it is almost not driveable with the A/C on (8 or less in/hg). i checked every conceivable vaccum hose and all other hoses. the biss screw and o-ring are still in tact as well. i recently had a CEL pop up on me, which i usually pay no attention to, but this happened around the same time. autozone is a bunch of lazy SOBs and will not read my CEL, nor speak english. what else could be the cause for this vaccum/idle leak? i have fidanza cam gears, is there anyway that adjusting the cams would improve vaccum? thanks in advance

 

[peregrine]

first off do the no brainer thing and get that CEL checked out. then do an intake leak test.

 

[WhipmastaFlex]

Originally posted by peregrine
first off do the no brainer thing and get that CEL checked out

yeah i waited in line at the local autozone for 15-20 minutes... started looking at APC products i was so bored. the line there doesn't move. worse than a bank line. where else can i go to get the CEL checked out? if i take it to SATAN, do they charge just to scan it? i need to find someone locally that can scan CELs

and would retarding/advancing the cams produce a better, more consistant idle? i have not had a problem with them up until now, however, there has always been a slight misfire. not sure if that would help any or not

 

[RedTurboEclipse]

u dont have any dsm buddies arond ur area with a logger who can pull the code for u?

 

[WhipmastaFlex]

well i finally got the nimwits at autozone to scan it. came up PO505: 'idle air control valve' malfunctioning. i haven't opened my Haynes manual yet to see what it is, where it is, and to take a guess how much it costs. anyone have this problem before?

 

[peregrine]

i think its on your throttle body. that would explain alot.

 

[Megaman]

my isc went out on me a few days ago too. $400 for a new one. cant believe it costs that much just to replace that damn little motor...i know they make rebuild one's, dont remember the site though.

 

[halvorja]

www.crebotech.com has rebuilt ISC motors and also shows you how to test yours to make sure that is your problem.

Jake

 

[WhipmastaFlex]

will the ISC off of a 1g work on a 2g?

 

[RamenPride]

Originally posted by WhipmastaFlex
will the ISC off of a 1g work on a 2g?

yes

 

[WhipmastaFlex]

well i pulled my ISC to check it... 32ohms between all 6 plugs, so i don't know what is going on with it. she moves in and out when i click the key to "on"... maybe it isn't coming on contact and i need to make an idle adjustment? it idles OK, just inconsistant and i have a loss of vaccum

 

[WhipmastaFlex]

bump...

if my throttle body is spotless, ISC (32ohms) is fine, the EGR is fine and the BISS (just replaced) is fine, would that leave me with the FIAV? and how can i check it's status... also, would swapping to a 1g 91-94 TB w/ an operating FIAV solve this problem? thanks

 

[GSX90]

Originally posted by WhipmastaFlex
will the ISC off of a 1g work on a 2g?

Only '91-'94 ISC motors will work on a 2g. '90s are different.