Poor idle help please
Thread Starter
Instructor
Joined: Oct 2006
Posts: 148
Likes: 0
From: New Braunfels TEXAS (Were really a country)
Poor idle help please
06 Z06 Maggie S/C, done right. Car make 700+ hp. When I am approaching a stop engage clutch and it wants to die, low rpm and will bounce between 2-300 up to 1100 rpm. Has died a couple of times. The car has 16000 miles and runs strong. Does seem to surge a little. The car is new to me and past owner has no idea of any problems. The air/fuel ratio meter seems erratic going all over the place (don't know if that's what it should do or not). I plan to pull codes asaic 
(as soon as I can) and try to check the vacuum. I thought I would ask you fine folks here first as I know you are all awesome. Thanks in advance. 
(as soon as I can) and try to check the vacuum. I thought I would ask you fine folks here first as I know you are all awesome. Thanks in advance.
Thread Starter
Instructor
Joined: Oct 2006
Posts: 148
Likes: 0
From: New Braunfels TEXAS (Were really a country)
no lights, no warnings, nothing. also seems to only do it when car is rolling to a stop. When car is stopped, foot off brake all is well idle is fine.
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
Only because it's not stock, the shop that tuned it, can do so that the car doesn't see issues because parameters have been played with. I hope that's not the case.
Id scan it anyway see what you get,
check vacuum hose, intake gaskets, inlet piping and clamps.
let me know if you get codes......
Id scan it anyway see what you get,
check vacuum hose, intake gaskets, inlet piping and clamps.
let me know if you get codes......
Thread Starter
Instructor
Joined: Oct 2006
Posts: 148
Likes: 0
From: New Braunfels TEXAS (Were really a country)
Will do. It was tuned by MTI about 1000 miles away. I will scan it tomorrow and see if it has codes. Would the inlet piping make that much of an impact?
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
i kinda wanted to think that too. He just got it so who knows. I just went through some half fast tuning in my build, don't wanna talk too soon but new guy see's all kinds of issues. currently on it now.
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Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
As for the OP, I understand that shop is 1000 miles away. If you (or a friend) had software like HP tuners, you could record some data while duplicating the conditions of your issue, you could then send them (or anyone) the data log file, help figure out what is going on exactly.
Race Director
Joined: Dec 2013
Posts: 12,505
Likes: 3,632
Bank that you have an intake air leak, and it was one of the O rings between the S/C base and the heads that rolled/came loose and did not seat correctly when they slide the S/C back in to place under the cowling (why the AFR numbers are all over the map).
104, and go a few more photo to see how the S/C has to be held up off the heads until you get it into position under the cowling to drop into place so the O rings stay seated in place instead. Also note that you have to lube with silicone, since if you use something like WD-40 or such, the petroleum product will eat away the O ring seals in short order instead.
http://www.magnacharger.com/pdf/manu...ntercooled.pdf
So on that note, you may be able to use starting fluid test for an air leak test, but looks like your are going to end up pulling the hat to replace the O rings and reinstall it.
104, and go a few more photo to see how the S/C has to be held up off the heads until you get it into position under the cowling to drop into place so the O rings stay seated in place instead. Also note that you have to lube with silicone, since if you use something like WD-40 or such, the petroleum product will eat away the O ring seals in short order instead.
http://www.magnacharger.com/pdf/manu...ntercooled.pdf
So on that note, you may be able to use starting fluid test for an air leak test, but looks like your are going to end up pulling the hat to replace the O rings and reinstall it.
Last edited by Dano523; Aug 3, 2015 at 06:49 AM.
Thread Starter
Instructor
Joined: Oct 2006
Posts: 148
Likes: 0
From: New Braunfels TEXAS (Were really a country)
Thanks for the info guys, I had to bleed the clutch Sunday (somehow got air into the system and it would not go into 1st or Rev) and did not get time to pull codes. Will got those and try the starting fluid test and get back with yall when I do. How hard is it to pull intake and replace gaskets, much different than stock
Drifting
Joined: Feb 2014
Posts: 1,418
Likes: 267
From: Pontiac Quebec
Thanks for the info guys, I had to bleed the clutch Sunday (somehow got air into the system and it would not go into 1st or Rev) and did not get time to pull codes. Will got those and try the starting fluid test and get back with yall when I do. How hard is it to pull intake and replace gaskets, much different than stock