Go Back   LS1TECH > SBC-BBC-LT1-LT4 PERFORMANCE > LT1-LT4 Modifications
Sign in using an external account
Register Forgot Password?
Search

LT1-LT4 Modifications
1993-97 Gen II Small Block V8

Reply
 
Thread Tools Search this Thread
Old 04-09-2010, 09:25 PM   #1
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 4
Join Date: Feb 2007
Location: NJ
Posts: 642
Send a message via AIM to transmaro93
Default lt1 idle problem need advise - fresh build

hey guys i have a freshly built 383 Lt1 and it will not idle. It runs pretty good but it just wont idle. Iv read about drilling the iac hole out, but i cant find a good write up on how exactly to go about doing it. Or would it be better to mess with the little throttle adjustment screw on the cable bracket to try and get it to idle that way. The only trick i think i don't want to do is to drill a hole directly into the throttle blade, that just doesn't look right to me. Its a summit brand 58mm TB. Im not throwing any codes and have driven the car the past two days around the block a few times and it still isn't throwing codes. any info on this would help me greatly. thanks car is obd2 if that matters
__________________
97' formula LT1 M6...
http://img404.imageshack.us/img404/4...xxxxkxknw9.jpg
transmaro93 is offline   Reply With Quote
Old 04-09-2010, 09:42 PM   #2
TECH Addict
Garage is empty, add now
 
bigj2717's Avatar
 
Trader Rating: 15
Join Date: Sep 2005
Location: San Antonio, TX
Posts: 2,065
Default

You might have to adjust your tps
__________________
95 Formula
Forged 383 ported heads cam full bolt-ons and 4.10 6-speed 410 rwhp 407 tq...yeah just another lt1 with a hot cam lol
bigj2717 is offline   Reply With Quote
Old 04-09-2010, 09:45 PM   #3
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 4
Join Date: Feb 2007
Location: NJ
Posts: 642
Send a message via AIM to transmaro93
Default

unless it moved (because i cracked part of the ear off when i was reaming the hole out) its set at .67... i need to get a new one but that one works for now just the ear is cracked...
__________________
97' formula LT1 M6...
http://img404.imageshack.us/img404/4...xxxxkxknw9.jpg
transmaro93 is offline   Reply With Quote
Old 04-09-2010, 09:53 PM   #4
TECH Addict
Garage is empty, add now
 
bigj2717's Avatar
 
Trader Rating: 15
Join Date: Sep 2005
Location: San Antonio, TX
Posts: 2,065
Default

I have the same throttle body and I adjusted the tps but if yours is reading right just use that screw on the other side. If i were you if you have room put a nut on it to lock it down because mine backed out on the highway and fell out
__________________
95 Formula
Forged 383 ported heads cam full bolt-ons and 4.10 6-speed 410 rwhp 407 tq...yeah just another lt1 with a hot cam lol
bigj2717 is offline   Reply With Quote
Old 04-09-2010, 09:56 PM   #5
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 4
Join Date: Feb 2007
Location: NJ
Posts: 642
Send a message via AIM to transmaro93
Default

cool.. maybe ill try that then... thanks for the head up on the lock nut thing... i mean im really hoping i can get this thing to idle... i have a funny feeling its a tune problem though, but im not sure yet... i mean i have to give the car gas to start it... which is weird for a fuel injected car...
__________________
97' formula LT1 M6...
http://img404.imageshack.us/img404/4...xxxxkxknw9.jpg
transmaro93 is offline   Reply With Quote
Old 04-09-2010, 11:43 PM   #6
TECH Senior Member
Garage is empty, add now
 
RamAir95TA's Avatar
 
Trader Rating: 2
Join Date: May 2005
Location: South Jersey
Posts: 9,488
Send a message via AIM to RamAir95TA
Default

Have you had it tuned yet?
__________________
95 T/A AI 200cc stock castings, 383, Performabuilt 4L60E, Ford 9", Tuned by PCMforless 3340#,
10.81 @ 124.16, 1.43 60' Video of 10-second pass 455whp, 445tq - Dyno Vid

LT1 PARTS For Sale, MSD Opti, steam crossover tube, BMR swaybar, MAF, etc.
RamAir95TA is offline   Reply With Quote
Old 04-10-2010, 12:35 AM   #7
On The Tree
Garage is empty, add now
 
Trader Rating: 3
Join Date: Jul 2009
Location: michigan
Posts: 127
Default

What is your fuel pressure at?Pull the vacuum line off the fpr and check for fuel in the line.
my1994z28 is offline   Reply With Quote
Old 04-10-2010, 01:09 AM   #8
TECH Addict
Garage is empty, add now
 
jaycenk's Avatar
 
Trader Rating: 1
Join Date: Jun 2009
Location: Holiday, FL
Posts: 2,201
Default

Crack those blades a little if you have had a tune done. Thats what I had to do to clean up the idle in gear (A4)
jaycenk is offline   Reply With Quote
Old 04-10-2010, 09:15 AM   #9
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 4
Join Date: Feb 2007
Location: NJ
Posts: 642
Send a message via AIM to transmaro93
Default

yea its had a pcmforless tune... i would like to get it to a dyno sooner or later to get a "real" custom tune for the car... pcm for less is usually good but iv hear stories here and there of people having problems with them... i will check to see if gas is coming out of the regulator also..i have to go out to work on my saturn today so maybe ill mess a little with this also... thanks for the help... so... so far nobody is recommending the IAC drill mod
__________________
97' formula LT1 M6...
http://img404.imageshack.us/img404/4...xxxxkxknw9.jpg
transmaro93 is offline   Reply With Quote
Old 04-10-2010, 10:05 AM   #10
On The Tree
Garage is empty, add now
 
Trader Rating: 3
Join Date: Jan 2006
Location: Lakeland
Posts: 182
Default

What are your IAC counts?
garage_queen is offline   Reply With Quote
Old 04-10-2010, 11:50 AM   #11
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 4
Join Date: Feb 2007
Location: NJ
Posts: 642
Send a message via AIM to transmaro93
Default

never got a good reading on them... ill have to wait till next week to borrow my freinds scanner to check them... they were like super low during first start up something like 9 or something but that was a few months back in like november and they haven't been checked since...
__________________
97' formula LT1 M6...
http://img404.imageshack.us/img404/4...xxxxkxknw9.jpg
transmaro93 is offline   Reply With Quote
Old 04-10-2010, 12:10 PM   #12
Staging Lane
1995 Chevrolet Camaro
My Garage
 
byatescmco's Avatar
 
Trader Rating: 0
Join Date: Dec 2008
Location: Abingdon, VA
Posts: 81
Default

open the blades and re-adjust tps. that's also what i had to do after my dyno tune. idled good while it was cold but after it warmed up...it had a little harder time breathing.
__________________
383 * a/i 200cc h/c * a/i s/s intake * moser 9 * 425rwhp 406 rwtq LT1 Slow Poke
byatescmco is offline   Reply With Quote
Old 04-10-2010, 12:28 PM   #13
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 4
Join Date: Feb 2007
Location: NJ
Posts: 642
Send a message via AIM to transmaro93
Default

well i just adjusted the blades a little and started her up... and she seemed to idle pretty good and strong... but then i went for a ride and sure enough she started to die when i came to a stop sign... i don't know whats wrong with it... i pulled back in the drive way and shut her down and then started her up and she started to idle again... i think im going to try and put some more gas in maybe something with the pump and its starving for gas when its moving... i don't know?? any ideas.. im not to hip on the pcm stuff yet...
__________________
97' formula LT1 M6...
http://img404.imageshack.us/img404/4...xxxxkxknw9.jpg
transmaro93 is offline   Reply With Quote
Old 04-10-2010, 12:52 PM   #14
On The Tree
Garage is empty, add now
 
Trader Rating: 3
Join Date: Jan 2006
Location: Lakeland
Posts: 182
Default

after you opened the blades did you adjust the TPS back to around .4?
garage_queen is offline   Reply With Quote
Old 04-10-2010, 01:39 PM   #15
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 4
Join Date: Feb 2007
Location: NJ
Posts: 642
Send a message via AIM to transmaro93
Default

crap i didnt think about that... ok i have to wait for that scanner... any idea why it would idle in the driveway but cut out when i start to drive it under load...
__________________
97' formula LT1 M6...
http://img404.imageshack.us/img404/4...xxxxkxknw9.jpg
transmaro93 is offline   Reply With Quote
Old 04-10-2010, 01:39 PM   #16
Staging Lane
1995 Chevrolet Camaro
My Garage
 
byatescmco's Avatar
 
Trader Rating: 0
Join Date: Dec 2008
Location: Abingdon, VA
Posts: 81
Default

Quote:
Originally Posted by transmaro93 View Post
well i just adjusted the blades a little and started her up... and she seemed to idle pretty good and strong... but then i went for a ride and sure enough she started to die when i came to a stop sign... i don't know whats wrong with it... i pulled back in the drive way and shut her down and then started her up and she started to idle again... i think im going to try and put some more gas in maybe something with the pump and its starving for gas when its moving... i don't know?? any ideas.. im not to hip on the pcm stuff yet...
i had to open my blades all the way on my holley 58mm to get it to idle. it idles a little fast when its cold but its just right after it warms.
__________________
383 * a/i 200cc h/c * a/i s/s intake * moser 9 * 425rwhp 406 rwtq LT1 Slow Poke
byatescmco is offline   Reply With Quote
Old 04-10-2010, 02:30 PM   #17
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 4
Join Date: Feb 2007
Location: NJ
Posts: 642
Send a message via AIM to transmaro93
Default

well i have the tune to idle at 900rpm... with the way the blades are set now its at around 1000rpm... but its just wierd that it doesnt idle when out on the road... only guy i know that can do a good job tuning is like an hour away and the car is just not drivable that far because of the idle issue
__________________
97' formula LT1 M6...
http://img404.imageshack.us/img404/4...xxxxkxknw9.jpg
transmaro93 is offline   Reply With Quote
Old 04-10-2010, 03:39 PM   #18
On The Tree
Garage is empty, add now
 
Trader Rating: 3
Join Date: Jan 2006
Location: Lakeland
Posts: 182
Default

once you adjust the TPS back where it needs to be I think you're idle will come down closer to the 900 the ECM is commanding. I noticed this as I was adjusting mine the other night. I would crack the blades open, RPMs would increase to 1200-1400, then I would adjust the TPS back to near .4v and the idle would come down. Not sure why you would be having trouble with it cutting out under load but I don't quite understand the statement either. Do you mean when your off the throttle coasting to a stop? Make sure you do the adjustments in closed loop also. If you can get a cable, go for a drive and log it, then post up the log or email it.
garage_queen is offline   Reply With Quote
Old 04-10-2010, 04:34 PM   #19
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 4
Join Date: Feb 2007
Location: NJ
Posts: 642
Send a message via AIM to transmaro93
Default

ok one of my buddies may have a cable and laptop that will work if he will let me borrow it... yea i mean that when im coasting to a stop it wants to cut out... but if im parked in the driveway it idles not to bad... but like i said i have to wait a few days for the scanner so ill post up my iac counts and whats going on in there when i get that... again thanks for all the help guys i really appreciate it
__________________
97' formula LT1 M6...
http://img404.imageshack.us/img404/4...xxxxkxknw9.jpg
transmaro93 is offline   Reply With Quote
Old 04-12-2010, 08:38 PM   #20
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 4
Join Date: Feb 2007
Location: NJ
Posts: 642
Send a message via AIM to transmaro93
Default

ok.. well my buddy came over today with the scanner and we hooked it up.. .and my IAC counts were through the roof (130 at idle)... so we decided to start drilling the hole through the TB where the IAC goes to let some air through... and sure enough it started coming down did this about 4 times and now my iac count is around 45 and the car is running great... starts up without having to add throttle... and idles when coasting to a stop... im going to go back in maybe tomorrow and go one more size bigger on the hole to get them to get down around the 35 area which i think they are sopposed to be? unless 45 is good because its running really good now.. so thanks for all the help... i thought id let you guys know how it went...
__________________
97' formula LT1 M6...
http://img404.imageshack.us/img404/4...xxxxkxknw9.jpg
transmaro93 is offline   Reply With Quote
Old 04-12-2010, 08:38 PM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Stop drilling those TBs, fix stalling without computer tuning... Another_User PCM Diagnostics & Tuning 122 03-24-2014 10:00 PM
98 Trans am Fuel Pressure problem and idle issues? Killerls170 Generation III Internal Engine 9 03-01-2014 08:13 AM
fed up with idle issue (getting worse) usnfenix Generation III External Engine 15 02-11-2012 10:42 AM
Low Vacuum at Idle - in the tune? Kevin Doe PCM Diagnostics & Tuning 8 10-26-2007 04:44 PM
car won't idle ms4 cam texas speed tune? HELP matthewjosh Generation III Internal Engine 15 06-24-2007 03:36 PM


Tags
1993, 9, 94, ati, build, damper, guide, high, iac, idle, installation, lean, lt1, moser, problems, super


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



Join Ls1Tech

All times are GMT -5. The time now is 09:19 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details