How do I set the idle on a new engine?
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
How do I set the idle on a new engine?
All of the sensors are new.. motor is new w/ LT-1 intake and a HOT cam
In what order should I set the sensors? It's not too bad now but it seems to be searching for an idle
In what order should I set the sensors? It's not too bad now but it seems to be searching for an idle
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
What sensors are adjustable on an LT1? None that I know of. The TPS can be checked to see if it is within the range acceptable by the ECM. You can adjust the minimum air (not a sensor) and make sure the IAC has gone through it's re-acclimation process. The idle speed is burned into the chip, and properly set up isn't adjustable without a re-burn.
RACE ON!!!
RACE ON!!!
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Do the IAC reset procedure, make sure you have no vacuum leaks and check your TPS voltage at idle and WOT. Make sure your TB is clean, your TB blades are set correctly and all applicable electrical connections are good. Regardless, you could benefit from a good dyno tune now too. Also make sure you have some slack in your throttle cable at idle. If necessary, the TPS can be made adjustable by elongating the bolt holes with a small circular file.
Last edited by Corvette Kid; Jul 9, 2006 at 06:13 PM.
Le Mans Master
Joined: Apr 2005
Posts: 8,077
Likes: 4
From: Scarborough ONTARIO
http://www.geocities.com/jgkov/index.html
Check the above link, i did according to that link. When i set .54 voltage than iat wot i was getting 4.2 so i increase to .65 than i was able to get 4.44 voltage. Cant get more than 4.6 voltage though.
But i dont have any problems. Even in morning starts in first crank and idles by itself (no need of pushing gas). Assuming u dont have any vaccum leak problems it will be all good.
I have 2 custom chips with 1> idles nice at 900-9500 rpm smooth and with 2> irratic idle rpm jumps between 500-1000 rpm with very rough idle. So if u have custom chip and getting irratic idle (jumping n bumping) than switch to stock chip to isolate idle problem.
Check the above link, i did according to that link. When i set .54 voltage than iat wot i was getting 4.2 so i increase to .65 than i was able to get 4.44 voltage. Cant get more than 4.6 voltage though.
But i dont have any problems. Even in morning starts in first crank and idles by itself (no need of pushing gas). Assuming u dont have any vaccum leak problems it will be all good.
I have 2 custom chips with 1> idles nice at 900-9500 rpm smooth and with 2> irratic idle rpm jumps between 500-1000 rpm with very rough idle. So if u have custom chip and getting irratic idle (jumping n bumping) than switch to stock chip to isolate idle problem.
Racer
Joined: Sep 2004
Posts: 495
Likes: 0
From: berwick pennsylvania
sami,
had the same voltage issue with my old tps. when ohmed at normal resting position it was 1 ohm lower than the new one and was almost a 2 full ohms less at max travel i still have to run my idle voltage higher than .54vdc (.595vdc) to get the full 5vdc at wide open throttle
had the same voltage issue with my old tps. when ohmed at normal resting position it was 1 ohm lower than the new one and was almost a 2 full ohms less at max travel i still have to run my idle voltage higher than .54vdc (.595vdc) to get the full 5vdc at wide open throttle
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
That's actually a really good idea with the chips - the chip im using is a clone of one that another forum member is using with a near-identical set up so hopefully that's all good
should i set the IAC first and then the TPS?
should i set the IAC first and then the TPS?
Originally Posted by sami85L98
http://www.geocities.com/jgkov/index.html
Check the above link, i did according to that link. When i set .54 voltage than iat wot i was getting 4.2 so i increase to .65 than i was able to get 4.44 voltage. Cant get more than 4.6 voltage though.
But i dont have any problems. Even in morning starts in first crank and idles by itself (no need of pushing gas). Assuming u dont have any vaccum leak problems it will be all good.
I have 2 custom chips with 1> idles nice at 900-9500 rpm smooth and with 2> irratic idle rpm jumps between 500-1000 rpm with very rough idle. So if u have custom chip and getting irratic idle (jumping n bumping) than switch to stock chip to isolate idle problem.
Check the above link, i did according to that link. When i set .54 voltage than iat wot i was getting 4.2 so i increase to .65 than i was able to get 4.44 voltage. Cant get more than 4.6 voltage though.
But i dont have any problems. Even in morning starts in first crank and idles by itself (no need of pushing gas). Assuming u dont have any vaccum leak problems it will be all good.
I have 2 custom chips with 1> idles nice at 900-9500 rpm smooth and with 2> irratic idle rpm jumps between 500-1000 rpm with very rough idle. So if u have custom chip and getting irratic idle (jumping n bumping) than switch to stock chip to isolate idle problem.
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Le Mans Master
Joined: Apr 2005
Posts: 8,077
Likes: 4
From: Scarborough ONTARIO
Originally Posted by 85blkrose
sami,
had the same voltage issue with my old tps. when ohmed at normal resting position it was 1 ohm lower than the new one and was almost a 2 full ohms less at max travel i still have to run my idle voltage higher than .54vdc (.595vdc) to get the full 5vdc at wide open throttle
had the same voltage issue with my old tps. when ohmed at normal resting position it was 1 ohm lower than the new one and was almost a 2 full ohms less at max travel i still have to run my idle voltage higher than .54vdc (.595vdc) to get the full 5vdc at wide open throttle
