atljar

?

And how bad is it to run a high IAC at idle (im trying to work on my split BLMs with the big cam)

Lyle A

50, But I can't answer the other half of your question.

NOMAD

Are you getting high idle or just crappy idle ?

I've got some things I could try on the TB depending on whats going on to help with the IAC counts

-Shannon

atljar

Neither shannon, but ever since i switched to the new TB, my BLMs split pretty bad. I used to be able to run them fairly close together, and have an at idle IAC of 25ish. Now i am running a 25ish IAC, with BLMS of 126/151 at idle .

If i close the blades any farther the IAC count will skyrocket. However i have not yet verified that the BLMs will pull together the way i want them to if i close the blades more, they may split even more, which would my fix problem as long as the IAC doesnt bottom out at 0.

atljar

The other thing, if i get the BLMs pulled together by closing the blades, can i just drill out the IAC hole a little bigger?

shoebox

Supposedly max counts are 255, but I have never seen any near that high on my car. Maybe about 140-ish is the highest I have seen, mostly in open loop and certain conditions with engine cool.

The higher the IAC counts are at idle, the less "range" you will have during driving when the counts normally go up.

atljar

hmmm.. LJs site it says max IAC is 160, so i have gotten 3 different answers now, lol.

Anyways, any issues running a really high IAC as long as you dont meet the max count?

Lyle A

The GM Service Manual for a 94 gives a typical data value range of 5-50. That's where I got 50 from.

atljar

lyle, good to know that GM doesnt mind a 50 count, that gives me a little breathing room to work with It doesnt happen to say the max counts in there does it?

Lyle A

As I researched further I found It's range to be 0-255. Shoebox is right as usual.

atljar

thank you

SweetZRag

Guys,

I am suddenly having a problem with rough idle when cold. I haven't done any work lately. I also have an oil leak that just started. It looks like the front main seal and maybe the intake manifold but I haven't confirmed yet.

I suspect a vacuum leak but can't tell for sure. Can you guys tell me if the freescan readings indicate any possible problems. The IAC looks high. Once the car warms up (5 minutes) or sooner if I punch it, the car idles fine. I have 2 sets of readings, engine cold (rough idle) and engine warm (idles fine).

TPS position-0, 0
Air flow-9, 7
IAC-71, 47
MAP-.417, ,388
Barometer-1.033
Left O2 volts-fluctuated between .124, .102 (fluctuating)
Right O2 volts-fluctuated between .155, .062 (fluctuating)
Mass Air Temp-27C, 25C (temperature dropped because I opened the garage door for fumes and it was cold outside.
Spark Advance-18, 18
Knock count-4706, 5443
Knock retard-0, 4
Integrator L-128, 128
Integrator r-128, 128
BLM contents-160, 160
BLM cell-16, 16


Thanks for the help...

Jeff

SweetZRag

Anybody?

atljar

Is it into closed loop yet?

kmook

160 from personal experience and also everything I've read.