LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

le3 383 wont stay running

Thread Tools
 
Search this Thread
 
Old Jan 27, 2008 | 06:18 PM
  #16  
thebufenator's Avatar
Thread Starter
Registered User
 
Joined: Feb 2007
Posts: 350


here is what i finally got. this is before starting. battery is now too low to start. notice the iac and desired idle.
Old Jan 27, 2008 | 08:42 PM
  #17  
thebufenator's Avatar
Thread Starter
Registered User
 
Joined: Feb 2007
Posts: 350
I just realized its not very clear, but you should still be able to read it.
the IAC is pegged at 160, and the desired idle is 3187.
The idle looks kinda........off......
Old Jan 27, 2008 | 08:45 PM
  #18  
shoebox's Avatar
Registered User
 
Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
IAC and desired idle are normal looking for a non-started engine. I had to cut and paste the URL into another window to be able to read it. A link would be better.
Old Jan 27, 2008 | 08:54 PM
  #19  
thebufenator's Avatar
Thread Starter
Registered User
 
Joined: Feb 2007
Posts: 350
ah okay......well I guess when the battery is charged again I can do some scanning then with it running.

I did drill a 9/64" hole for the IAC bypass, but haven't been able to test it yet.

I also noticed something funky with the intake. Its a LE ported intake that I goit used......
and the common area the the idle air flows into the spreads it into the cylinders.....has been ported so that it connects to the upper intake area. I'll take a picture tommorrow in the light, but I am guessing that doesn't help the idle quality.
Old Jan 28, 2008 | 02:16 PM
  #20  
thebufenator's Avatar
Thread Starter
Registered User
 
Joined: Feb 2007
Posts: 350
well I think the chambers are flooded, can I just unplug the injectors and crank it over to clear them ou?
Old Jan 28, 2008 | 02:21 PM
  #21  
Injuneer's Avatar
Administrator
 
Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
Put the throttle on the floor when you go to start it..... that puts the PCM in "clear flood" mode, and it shuts the fuel almost off.
Old Jan 28, 2008 | 02:25 PM
  #22  
thebufenator's Avatar
Thread Starter
Registered User
 
Joined: Feb 2007
Posts: 350
thats good to know, thanks
Old Jan 28, 2008 | 07:35 PM
  #23  
ulakovic22's Avatar
Registered User
 
Joined: Sep 2004
Posts: 1,872
From: Lantana, TX
Have you hooked up a vacuum gauge to it at all? Either that or read your MAP value and subtract it from the Barometric pressure.
Old Jan 28, 2008 | 08:01 PM
  #24  
thebufenator's Avatar
Thread Starter
Registered User
 
Joined: Feb 2007
Posts: 350
MAP and BAR both read 1 when its not doing anything.....

Haven't gotten it to start since I got the laptop connected
battery died again, so its charging right now
Old Jan 28, 2008 | 08:24 PM
  #25  
ulakovic22's Avatar
Registered User
 
Joined: Sep 2004
Posts: 1,872
From: Lantana, TX
I'm not familiar with what software you are using, but when I used AutoTap the other day after putting in my new motor, Barametric pressure was 29.xx and MAP was reading 9.4 or so, so I had roughly 20 inches of vacuum at idle. I'm not familiar with newer automatics but on older cars it was generally a sign of a vacuum leak when a motor would die when dropping it into gear. Also would explain your no brakes issue as well. Even the LE3 should have vacuum maybe around 8-10 inches at least I would think, but I don't know anyone who has had one so I can be for sure.
Old Jan 28, 2008 | 09:20 PM
  #26  
thebufenator's Avatar
Thread Starter
Registered User
 
Joined: Feb 2007
Posts: 350
I really dont think the brakes is an issue at all........I think its just air in the lines.
without the engine running I can somewhat easily put my foot to the floor with the brakes. With the engine running it goes to the floor with almost no force.

When I do get a chance to run it on thursday I will try autotap
Old Jan 29, 2008 | 01:06 AM
  #27  
LT4 Formula's Avatar
Registered User
 
Joined: Jul 2007
Posts: 39
My LE3 383 has about 8 inches of vacuum at idle.
As for getting it to stay running, it sounds like you need to adjust your TB until your IAC counts are down. Don't forget to reset your TPS after.

Last edited by LT4 Formula; Jan 29, 2008 at 05:08 PM. Reason: Don't post late at night
Old Jan 29, 2008 | 07:33 AM
  #28  
Injuneer's Avatar
Administrator
 
Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
Originally Posted by LT4 Formula
My LE3 383 has about 22 inches of vacuum at idle.
As for getting it to stay running, it sounds like you need to adjust your TB until your IAC counts are down. Don't forget to reset your TPS after.
Unusual for an aggressive cam of any sort to pull more vacuum than the stocker??????
Old Jan 29, 2008 | 07:58 AM
  #29  
ulakovic22's Avatar
Registered User
 
Joined: Sep 2004
Posts: 1,872
From: Lantana, TX
I was thinking the same thing when I read that. The stock motor I just put in pulls around 20.

If you can put your foot to the floor easily with the car off or running then there is something wrong with your brakes in my opinion. When I was bleeding my brakes the other day it was hard as a rock.
Old Jan 29, 2008 | 11:29 AM
  #30  
LT4 Formula's Avatar
Registered User
 
Joined: Jul 2007
Posts: 39
Originally Posted by Injuneer
Unusual for an aggressive cam of any sort to pull more vacuum than the stocker??????
I'd agree with you. I was just looking at the Datamaster logs @ idle. I've also never had any issues with braking.



All times are GMT -5. The time now is 03:50 PM.