LT1 High Idle

[ReidB]

OK quick update... Installed a new TPS, BWD unit, US made, worked great. Disconnected all interconnections between the ECM and TCM. Fired right up, sounded pretty good, idle will only go down to 1200-1300rpm with IAC closed. It looks like the air hole between the throttle plates was probably drilled larger than stock.
The right O2 is intermittantly dropping to 0. Something not right there.
I had turned off the MAF enable flag. Turned flag back on, went to flash, got an EEhack error "Select T side or select E side to flash". Both are greyed out. Don't know what to do....
Forcing closed loop mellows out the idle, but runs rich. Hopefully the O2 issue.
Not sure how to get the truck puter to share signals without screwing up the engine puter signals. Has anyone done this successfully? I'm thinking a voltage follower buffer chip might keep the two isolated. Gonna need more beer to get thru this:)
I've attached my last eehack log file.

Thanks all!

[steveo]

when both options are greyed out, that means your 'compare' bin is identical to the bin you are trying to flash.

[ReidB]

when both options are greyed out, that means your 'compare' bin is identical to the bin you are trying to flash.

Thanks Steveo. I thought I had toggled a flag or two. Will give it another try.

[ReidB]

Another question...
Is there a way to reset the IAC pintle depth? Mine is staying open at 0 counts. Enough to maintain 1600 idle. Cover the IAC port and idle comes right down.

[91ss]

Sounds like it might be time for a new one.

[bentrod]

for 93 lt1, TECH 1 or equivalent tool can manually control. Probably applies for your year too. Though if counts at 0 and you're idling at 1600rpm, sounds like something else is wrong like vacuum leak or tuned too lean (e.g. injector values incorrectly set).

Maybe check IAC pintle seat for obstructions/jams? Also all intake related gaskets good and hoses/blockoffs in good shape? You can spray starter fluid to listen to rpm change sometimes.

[ReidB]

for 93 lt1, TECH 1 or equivalent tool can manually control. Probably applies for your year too. Though if counts at 0 and you're idling at 1600rpm, sounds like something else is wrong like vacuum leak or tuned too lean (e.g. injector values incorrectly set).

Maybe check IAC pintle seat for obstructions/jams? Also all intake related gaskets good and hoses/blockoffs in good shape? You can spray starter fluid to listen to rpm change sometimes.

Thanks guys. I checked for vacuum leaks with carb cleaner, hard to get good feel with the high rpm. Pumped intake full of smoke (finally a good use for a year old cigar) no leaks. Replaced IAC, reset pcm, fired up and rpm came right down.

[ReidB]

Sounds like it might be time for a new one.

You're 2 for 2!