Idle tune
Thread Starter
Joined: Aug 2004
Posts: 363
Likes: 1
From: Colorado Springs, CO
Idle tune I was hoping to find someone locally that can do some idle tuning on my car. I can't deal with this lope anymore. I have LS1Edit to. I'll buy a wideband if need be. I had the car dyno tuned years ago, and accepted it as being normal. I've talked with many people who had crazier setups, and beter idle quality.
The symptoms are on an idle while slowing down. It will begin to lope way down low. For instance, while coming to a red light, slowing down under 20mph. Once it's stopped, the idle levels out and it's normal. This has happened since day one. It's not something new.
Years ago, I set the idle screw out a bit, and drilled out the TB just a bit. Both of those seemed to help.
Specs are Stage 2 PP 5.3 heads
225/225 .589/.589 112 LSA
Full Intake/Exhaust
Auto w/3200 Vig Stall
Thanks,
Chris
The symptoms are on an idle while slowing down. It will begin to lope way down low. For instance, while coming to a red light, slowing down under 20mph. Once it's stopped, the idle levels out and it's normal. This has happened since day one. It's not something new.
Years ago, I set the idle screw out a bit, and drilled out the TB just a bit. Both of those seemed to help.
Specs are Stage 2 PP 5.3 heads
225/225 .589/.589 112 LSA
Full Intake/Exhaust
Auto w/3200 Vig Stall
Thanks,
Chris
Years ago, I set the idle screw out a bit, and drilled out the TB just a bit. Both of those seemed to help.
Neither are necessary with tuning software.
If you have LS1edit, you should be able to go in and adjust your base running airflow. Raise it up 2.0 after 46* and the car should idle fine. A 225 duration cam shouldn't be giving you any idle problems unless there's something else wrong with the car. FYI a wideband isn't really necessary unless you're tuning WOT.
Thread Starter
Joined: Aug 2004
Posts: 363
Likes: 1
From: Colorado Springs, CO
I've talked to a lot of people, and they said the same thing about the idle. I'll look at that table if it's available in my prehistoric version of LS1edit this weekend.
Thanks Damian,
Chris
Thanks Damian,
Chris
Thread Starter
Joined: Aug 2004
Posts: 363
Likes: 1
From: Colorado Springs, CO
I'm already one step ahead of you on that. I'm working with someone on LS1Tech to get an unmolested TB or a simple TB Blade. However, I think I just drilled out 1/16" or 1/8" above what it was stock. I moved up by 1/32" two or three times when i drilled it out.
I also just picked up a stocker MAF to rule out everything. I had a GMAF.
I will look into the table you mentioned when I can find a damn computer w/Windows 2000, or get that OS loaded on my mini HP. LS1Edit version 1.ancient.old doesn't like XP so much.
-Chris
I also just picked up a stocker MAF to rule out everything. I had a GMAF.
I will look into the table you mentioned when I can find a damn computer w/Windows 2000, or get that OS loaded on my mini HP. LS1Edit version 1.ancient.old doesn't like XP so much.
-Chris
There's two of your problems.
Neither are necessary with tuning software.
If you have LS1edit, you should be able to go in and adjust your base running airflow. Raise it up 2.0 after 46* and the car should idle fine. A 225 duration cam shouldn't be giving you any idle problems unless there's something else wrong with the car. FYI a wideband isn't really necessary unless you're tuning WOT.
Neither are necessary with tuning software.
If you have LS1edit, you should be able to go in and adjust your base running airflow. Raise it up 2.0 after 46* and the car should idle fine. A 225 duration cam shouldn't be giving you any idle problems unless there's something else wrong with the car. FYI a wideband isn't really necessary unless you're tuning WOT.
I'm already one step ahead of you on that. I'm working with someone on LS1Tech to get an unmolested TB or a simple TB Blade. However, I think I just drilled out 1/16" or 1/8" above what it was stock. I moved up by 1/32" two or three times when i drilled it out.
I also just picked up a stocker MAF to rule out everything. I had a GMAF.
I will look into the table you mentioned when I can find a damn computer w/Windows 2000, or get that OS loaded on my mini HP. LS1Edit version 1.ancient.old doesn't like XP so much.
-Chris
I also just picked up a stocker MAF to rule out everything. I had a GMAF.
I will look into the table you mentioned when I can find a damn computer w/Windows 2000, or get that OS loaded on my mini HP. LS1Edit version 1.ancient.old doesn't like XP so much.
-Chris
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What an incorrect crock of ****. I can't believe a sponsor is seriously advising that someone leaves their airflow tables stock with a modified engine
Last edited by Damian; Sep 27, 2009 at 11:12 PM.
Thread Starter
Joined: Aug 2004
Posts: 363
Likes: 1
From: Colorado Springs, CO
I appreciate all the responses so far. Currently, I don't have the ability to look at my latest LS1Edit file. I have to find a computer with Windows 2000, because of the old version I have.
I will check out the IAC, Throttle tables, and Base Running Airflow tables. It should take a few days for me to do this. I don't know if all the tables will be available though, I haven't looked at LS1Edit in quite some time.
I will report back as soon as I get this info. It will probably take a few days.
I will check out the IAC, Throttle tables, and Base Running Airflow tables. It should take a few days for me to do this. I don't know if all the tables will be available though, I haven't looked at LS1Edit in quite some time.
I will report back as soon as I get this info. It will probably take a few days.
Thread Starter
Joined: Aug 2004
Posts: 363
Likes: 1
From: Colorado Springs, CO
Should have the hardware to hook up to the PCM tomorrow. I searched my Users guide for my LS1Edit version 1.21. Here are the following tables I found. No "Base Running Airflow" tables were really found. I may need to buy a newer version of a tuner.
P/N Delay
Delay in seconds that Throttle is held after letting off throttle, before allowing the decay listed in “P/N Airflow Decay”
Airflow Decay In Gear
Allowed Airflow decay in Grams per second per 12.5 Milliseconds when in Gear.
P/N Airflow Decay
Allowed Airflow decay in Grams per second per 12.5 Milliseconds when in Park or neutral.
P/N Delay
Delay in seconds that Throttle is held after letting off throttle, before allowing the decay listed in “P/N Airflow Decay”
Airflow Decay In Gear
Allowed Airflow decay in Grams per second per 12.5 Milliseconds when in Gear.
P/N Airflow Decay
Allowed Airflow decay in Grams per second per 12.5 Milliseconds when in Park or neutral.
There's two of your problems.
Neither are necessary with tuning software.
If you have LS1edit, you should be able to go in and adjust your base running airflow. Raise it up 2.0 after 46* and the car should idle fine. A 225 duration cam shouldn't be giving you any idle problems unless there's something else wrong with the car. FYI a wideband isn't really necessary unless you're tuning WOT.
Neither are necessary with tuning software.
If you have LS1edit, you should be able to go in and adjust your base running airflow. Raise it up 2.0 after 46* and the car should idle fine. A 225 duration cam shouldn't be giving you any idle problems unless there's something else wrong with the car. FYI a wideband isn't really necessary unless you're tuning WOT.
Whiteforumla, if I were you, I'd be looking over your motor for any type of vacuum leak or mechanical issue first. Unless you got the wrong cam, no way should a 225 cam have problems idling, even with a stock tune. The 228/232 cams I use will idle on a stock tune, hell even my 230/238 cam will idle on a cold start without any tuning. I think there's an issue somewhere.
Check for leaks around the MAF, TB gasket, or MAP sensor. Log your fuel trims at idle and tell me what they're doing. I just find it tough to swallow that a 225 cam won't idle.
Check for leaks around the MAF, TB gasket, or MAP sensor. Log your fuel trims at idle and tell me what they're doing. I just find it tough to swallow that a 225 cam won't idle.
Thread Starter
Joined: Aug 2004
Posts: 363
Likes: 1
From: Colorado Springs, CO
Damian,
I will check those to. I am loading up Windows 2k & LS1Edit as we speak on an old laptop. I'll be able to post up my last LS1 Program.
I also have thought about pulling all the intake/vacume one evening and give the seals/gaskets a good look over.
I have no rear OS's, so can I log LTFT's?
-Chris
I will check those to. I am loading up Windows 2k & LS1Edit as we speak on an old laptop. I'll be able to post up my last LS1 Program.
I also have thought about pulling all the intake/vacume one evening and give the seals/gaskets a good look over.
I have no rear OS's, so can I log LTFT's?
-Chris
Thread Starter
Joined: Aug 2004
Posts: 363
Likes: 1
From: Colorado Springs, CO
Pictures like I promised.
LS1Edit.bmp: Picure showing all the available sections
Engine--idle limiters.bmp: Picture showing 4 tabs available under Engine Calibration
IAC-Park: IAC Park Position Airflow (Graph)
Running-Airflow.bmp: Damian, I believe to the best of my knowledge, that this is the Base Running Airflow you mentioned.
When I get home, I am going to pull the most current LS1Edit file. I just looked (edited this post) and those were before my tuning was done.
LS1Edit.bmp: Picure showing all the available sections
Engine--idle limiters.bmp: Picture showing 4 tabs available under Engine Calibration
IAC-Park: IAC Park Position Airflow (Graph)
Running-Airflow.bmp: Damian, I believe to the best of my knowledge, that this is the Base Running Airflow you mentioned.
When I get home, I am going to pull the most current LS1Edit file. I just looked (edited this post) and those were before my tuning was done.
Last edited by white2001formula; Oct 1, 2009 at 01:12 PM. Reason: Added info
Thread Starter
Joined: Aug 2004
Posts: 363
Likes: 1
From: Colorado Springs, CO
Alright, valid data now. Here are the pictures. How high can I go on these values before it's something mechanical?
Stock Idle table
Idle table I dealt with before
Idle table that I'm about to upload
Stock Idle table
Idle table I dealt with before
Idle table that I'm about to upload
Thread Starter
Joined: Aug 2004
Posts: 363
Likes: 1
From: Colorado Springs, CO
Just got back from a nice little drive around town. It idle's better, much better actually. I am going to pull the Intake Manifold this weekend and double check some stuff.