Well if what Dash Command says is correct then my idle speed is 650. Not disagreeing, but it does seem strange that a 96 5.7 truck is 650 and a 98 5.7 truck is 550. Seems like big difference.
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- Thread starter Caman96
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L31MaxExpress
I'm Awesome
I just looked and my stock 2002 0411 Van PCM read, 625 on it. My 99 Tahoe and my brothers 99 Suburban were both 600. I have atleast a dozen stock calibration reads on these L31s.
By chance you have one for 96?
L31MaxExpress
I'm Awesome
I do not have 96 or 97 to look at nor do I have the definition file to view or edit one at the moment. 98+ is what I have on hand. Trucks, SUVs, and Vans.
Throttle body would like to thank you as well, she got an extra ******(dewsh).
Just as a follow up, I had emailed BlackBear 3 weeks ago, asking them to confirm what my “Commanded Idle” was. They just responded and it is 650 rpm(in gear, at temp.). And that’s what I’ve got.
So that email confirmed it is 650, at temp in gear. Ok, I figured that was what pcm was originally tuned with.
Then out of the blue I get this from Black Bear yesterday.
“We bump it up slightly to ensure a smooth idle. Factory RPM is often too low for smooth operation. It is still programmed to be lower in gear than park/neutral”.
Kinda seems strange they would do that.
Lower idle speed in gear provides feedback that the vehicle is in fact in gear, and as a bonus the lower idle speed limits "creep" when the vehicle is stopped. Higher idle in park/neutral assures that the engine doesn't stall when put in gear. The IAC can't react that fast, so if the idle speed was always low, you'd have a drop in RPM until the IAC could recover, potentially stalling the engine. If idle speed was always high, the vehicle would need excessive braking when stopped at a stop light.
The Salmon
Newbie
I replaced the distributor on my 1999 Yukon making sure I was at TDC. It slipped right in and the vehicle is running great. However, upon checking the offset I am at -2.31 degrees. Does the .31 make a difference? The distributor I purchased had the hold down clamp attached so it can only go on the dizzy one way and is hard to remove. Therefore, I cannot really twist the dizzy to get to 0 degrees. Should I go through the hassle of trying to pry off the hold down bracket and replacing it to get that .31 degrees off?
w/clamp
w/clamp
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