High idle after running.. Some questions

[-=Jeff=-]

I did some searching on here, but I need to be verified..

with key on, not running, secondary pump runs every 30 secs for about 10 secs maybe..

When I start the car the it idles around 700 rpm.. if I drive it a short bit it will not drop below 100 it seems.

Can the secondary vacuum lines be a cause of the higher idle? Primary map is connected fine, as is fuel regulator. I took the vacuum hose off the driver side of plenum and blew air in it.. that is okay.. I know there are probably more I need to look at any spots more then others?

I need to put my scanner on it and check the IAC steps and such too, but I did not have time tonight.

just trying to see what I need to look at, I really don't want to pull the plenum but if I have to I will.

[tccrab]

Jeff:

Had a similar problem on my '90, turned out to be a vacuum leak.
On mine it was the funky PVC two hose connector just behind and under the throttle body on the drivers side. If it's not *EXACTLY* in the right position it leaks.
I had a heck of a time getting mine to seal, I swore that if it ever gave me problems again I'd replace the f*ing thing with fuel hose and hose clamps.

Have you tried tapping the throttle after the car comes to a stop? If that kicks the idle down then I'd say it's more likely in the throttle body. If the primary throttle body blade doesn't close all the way it'll cause idle problems. The mechanism might be gummed up a little and need a little WD40.

Good luck!

TomC

[-=Jeff=-]

Originally Posted by tccrab

Jeff:

Had a similar problem on my '90, turned out to be a vacuum leak.
On mine it was the funky PVC two hose connector just behind and under the throttle body on the drivers side. If it's not *EXACTLY* in the right position it leaks.
I had a heck of a time getting mine to seal, I swore that if it ever gave me problems again I'd replace the f*ing thing with fuel hose and hose clamps.

Have you tried tapping the throttle after the car comes to a stop? If that kicks the idle down then I'd say it's more likely in the throttle body. If the primary throttle body blade doesn't close all the way it'll cause idle problems. The mechanism might be gummed up a little and need a little WD40.

Good luck!

TomC

Tom, Yes I check ed the TB tapping it, it did not help. that 2 PCV hose connector was replaced before I got it, the hose are both individual but I will lok at theat too.

I also will reset the IAC and see if that helps.

[GrayZ]

Hey, Jeff,

i get the same damn feeling, i just don't run anymore.
I'm walking at every chance.
Am I in the right post?
where the hell am i ?

[-=Jeff=-]

Originally Posted by ITLGO2

Hey, Jeff,

i get the same damn feeling, i just don't run anymore.
I'm walking at every chance.
Am I in the right post?
where the hell am i ?

LMAO..

where are you? you are HERE!!!

LOL

[XfireZ51]

Jeff,

You'll want to look at the IAC counts. I adjusted the MinAir on mine to the point where the throttle stop barely touches the throttle body. My idle is around 800rpm. I have been getting a slight surging which had me suspecting a vacuum leak but I think I have been able to smooth it out modifying the timing and VE at idle.
Did you check line from secondary pump to under the plenum? Does it hold vacuum?
See what MAP is at idle.
Lgaff started his up and then did the IAC adjust and he says his idles fine now.

This is where having the Ostrich really helps. I sat in the garage yesterday and played with the cal with motor running. I made successive changes to the Prop Gains and downloaded bin. Worked great. I could immediately see which direction I needed to make changes in without running back and forth to the eraser/burner.

[-=Jeff=-]

thanks for the tips guys.. I was thinking about it last night too.. specifically that 'F' connector for the PCV.. Since I know my 90 with NEVER be NCRS, I might find something else, at the local ACE, then use some old PCV hose from my 89 (if I still have some) and create something better. I know the PCV on my 89 would not get that loose, but there are many different factors between the 2 motors.

I also have the Latest MEMCAL Binary file to change as the PROM in the car was the older mask with the VERY high IAC count settings.. The Newer Mask will probably help too

[-=Jeff=-]

I Found that my PROM even though it was a 'Tuner' PROM, still used the early base BCC so I had a later BCC Bin file and changed the fan turn on and burned it to try.

Starts up at 1500 rpm and drops off quickly to around 800 I think.. hard to tell with the GM Accurate Tach

[XfireZ51]

Jeff,

We should try putting a 92 stock bin on your chip and see how it works.

[bldavis11]

Did you guys ever get this sorted out?