why does my car idle like this??
why does my car idle like this?? I just had a mail order tune done, and the car idles weird when it will idle. Just wondering if you guys have any clues whats causing this. This is a cam and LT only car with a TSP 231/237 595 598 on a 112 lsa. Its a six speed. This is a cold idle, but it idles exactly the same when warm.
Just added a warm idle clip. What does everyone think??
http://s143.photobucket.com/albums/r...midle900-1.flv
http://s143.photobucket.com/albums/r...rent=idle1.flv
Just added a warm idle clip. What does everyone think??
http://s143.photobucket.com/albums/r...midle900-1.flv
http://s143.photobucket.com/albums/r...rent=idle1.flv
Last edited by Jasonscott; Apr 2, 2007 at 07:30 AM.
Originally Posted by Jrp1978
Not to flame you dude , but its the cam ! You have a 112 lsa what are you wanting it to idle like?
Sound pretty tuff to me!
Sound pretty tuff to me!
Teching In
Joined: Feb 2005
Posts: 21
Likes: 0
Trending Topics
I posted in the other thread..
So me, it sounds like your timing is erratic at idle, like not all your timing tables are set at the same timing for idle, maybe your car is jumping from the base to high octane tables possibly.
I had a car I tuned do that pretty bad with a 240/244 112 cam when cold and I had to adjust all the timing tables to read the same at idle and adjust the over/under spark correction so it wouldn't move around so much. it sounded almost identical to your car in the video.
I Know numerous cars in my area with that cam and none of them sound like that.
just my .02
So me, it sounds like your timing is erratic at idle, like not all your timing tables are set at the same timing for idle, maybe your car is jumping from the base to high octane tables possibly.
I had a car I tuned do that pretty bad with a 240/244 112 cam when cold and I had to adjust all the timing tables to read the same at idle and adjust the over/under spark correction so it wouldn't move around so much. it sounded almost identical to your car in the video.
I Know numerous cars in my area with that cam and none of them sound like that.
just my .02
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by Chris81
I posted in the other thread..
So me, it sounds like your timing is erratic at idle, like not all your timing tables are set at the same timing for idle, maybe your car is jumping from the base to high octane tables possibly.
I had a car I tuned do that pretty bad with a 240/244 112 cam when cold and I had to adjust all the timing tables to read the same at idle and adjust the over/under spark correction so it wouldn't move around so much. it sounded almost identical to your car in the video.
I Know numerous cars in my area with that cam and none of them sound like that.
just my .02
So me, it sounds like your timing is erratic at idle, like not all your timing tables are set at the same timing for idle, maybe your car is jumping from the base to high octane tables possibly.
I had a car I tuned do that pretty bad with a 240/244 112 cam when cold and I had to adjust all the timing tables to read the same at idle and adjust the over/under spark correction so it wouldn't move around so much. it sounded almost identical to your car in the video.
I Know numerous cars in my area with that cam and none of them sound like that.
just my .02
Originally Posted by 00PewterSS
Ah, yeah it is supposed to idle like that. If you wanted a smooth idle you should have went with a 114 or more LSA. Sounds good.
Brian
Brian
Originally Posted by ZL1Killa
get all your high octane/low octane/base spark in neutral/gear to 1 set value.
Is this something that can be done with a mail order tune or do you need logging software and everything to do this. This was a mail order tune on the car right now, Im just wondering if I can explain this to the tuner and come away with good results, or should I just get tuning software and give that a try?
Ok I have to admit I listened to the first 20 sec of the 1st clip... and I didn't listen to the 2nd one at all. It sounds good in the first 20 sec of the clip. Then the 2nd clip and the latter part of the first clip it sounds like my car w/o a tune before it is warmed up.
Mine isn't getting enough air on stock tune, yours may not be getting enough spark or it is idling too low. But I can hear what you are talking about after listening to the entire thing. I would check the wires and stuff just to make sure you don't have a miss from a plug wire first.
If you have a shop near you, just take it to someone experienced and they should be able to point you in the right direction.
Brian
Mine isn't getting enough air on stock tune, yours may not be getting enough spark or it is idling too low. But I can hear what you are talking about after listening to the entire thing. I would check the wires and stuff just to make sure you don't have a miss from a plug wire first.
If you have a shop near you, just take it to someone experienced and they should be able to point you in the right direction.
Brian
Originally Posted by 00PewterSS
Ok I have to admit I listened to the first 20 sec of the 1st clip... and I didn't listen to the 2nd one at all. It sounds good in the first 20 sec of the clip. Then the 2nd clip and the latter part of the first clip it sounds like my car w/o a tune before it is warmed up.
Mine isn't getting enough air on stock tune, yours may not be getting enough spark or it is idling too low. But I can hear what you are talking about after listening to the entire thing. I would check the wires and stuff just to make sure you don't have a miss from a plug wire first.
If you have a shop near you, just take it to someone experienced and they should be able to point you in the right direction.
Brian
Mine isn't getting enough air on stock tune, yours may not be getting enough spark or it is idling too low. But I can hear what you are talking about after listening to the entire thing. I would check the wires and stuff just to make sure you don't have a miss from a plug wire first.
If you have a shop near you, just take it to someone experienced and they should be able to point you in the right direction.
Brian
Originally Posted by Jasonscott
Thank you! Finally someone who hears what im hearing. I had a feeling it was maybe timing. The thing is the car would also do the exact same thing on the stock tune sometimes (mostly when cold) but when it was warm it would idle just like it was supposed to most of the time. You dont think it has anything to do with fueling, this thing seems excessively rich if I come to a stop at a light or something I immediatelly smell fuel coming into the car, I dont even have to sit there a while.
I immediately I noticed on the video the wild idle that DOESNT sound normal and the first thing I thought of was a timing issue because the car isn't surging like all the cars i've seen without enough desired (RAF) airflow. They usually have a wider gap of rpm since the pcm is searching for the idle. Your car has the idle, its just having a hard time controlling it.
My .02
It sounds mean! I think you guys are a bit off, I don't really hear much deviation from what is allowed. After revving it fell back to idle relatively quickly once the throttle-follower's delay had expired and didnt have any overshoot.
Is there some problem you are having with it like excessive surging or stalling or do you just think it doesn't sound like you think it should?
Is there some problem you are having with it like excessive surging or stalling or do you just think it doesn't sound like you think it should?
Well, for comparison, here is my stock bottom end LS1 with the TSP 231/237 112lsa cam at idle.
http://smg.photobucket.com/albums/v6...231237idle.flv
Something sounds different.
http://smg.photobucket.com/albums/v6...231237idle.flv
Something sounds different.
Another thing to consider:
My car idles like that (put, put, put, put...) when the AFR leans out to 16:1 and higher. When the AFR is ~15.5:1 and under, it sounds more like the typical cam (potato, potato, potato, potato, potato...).
My car idles like that (put, put, put, put...) when the AFR leans out to 16:1 and higher. When the AFR is ~15.5:1 and under, it sounds more like the typical cam (potato, potato, potato, potato, potato...).