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Old Dec 17, 2013, 06:43 PM
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Idle + Boomba problem

Hi guys, i hope you can help me...

i just swap some parts...


i had 70mm fullblown tb, JMFAB Intake Manifold, now 75mm Boomba TB and AMS F1 Manifold

now i have some idle problems... cold is perfect... 1200-1500 rpms and good AFRS, but when the evo is warm the the rpms bounce between 1000 and 2000 rpms and the engine die...

i just checked with evoscan and the problem start at 80C degrees

i don't know if i need to adjust the speed density tables...

after boomba tb and ams manifold the idle was perfect.. 1000-1200 with no problems...

i hope you can help me...
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Old Dec 17, 2013, 07:20 PM
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Check the throttle stop screw. I have an s90 throttle body and had hot start issues.....turns out the stop screw wasnt set correctly and the throttle blade was completely shut.
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Old Dec 17, 2013, 07:28 PM
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Originally Posted by GotWheelHop View Post
Check the throttle stop screw. I have an s90 throttle body and had hot start issues.....turns out the stop screw wasnt set correctly and the throttle blade was completely shut.


Also, check for boost leaks when car is warm. It may be totally leak free when cold and as it heats up a leak is created. Did your torque the mani to specs? New gaskets?
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Old Dec 17, 2013, 11:17 PM
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boost leak free, new gasket, everything is fine....

i just adjust the ISCV Initial step position with ac off table and now the idle is fine..

now the problem is when i rev the engine the rpms go up and then fall to 300-400rpms and the engine die...

do you think is a boost leak??
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Old Dec 18, 2013, 03:53 AM
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That would have to deal with you iscv settings and idle stepper table.
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Old Nov 24, 2015, 07:03 AM
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Originally Posted by Sideck View Post
Hi guys, i hope you can help me...

i just swap some parts...


i had 70mm fullblown tb, JMFAB Intake Manifold, now 75mm Boomba TB and AMS F1 Manifold

now i have some idle problems... cold is perfect... 1200-1500 rpms and good AFRS, but when the evo is warm the the rpms bounce between 1000 and 2000 rpms and the engine die...

i just checked with evoscan and the problem start at 80C degrees

i don't know if i need to adjust the speed density tables...

after boomba tb and ams manifold the idle was perfect.. 1000-1200 with no problems...

i hope you can help me...
Hey man, I know this thread has been in the darkside for a while, did you ever found the problem. I am having the same exact thing.
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Old Jan 15, 2016, 08:47 AM
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Originally Posted by luisderoux View Post
Hey man, I know this thread has been in the darkside for a while, did you ever found the problem. I am having the same exact thing.
I know I am not the original poster, but I am about to purchase pte1200's since my cam is helping max out factory injectors at just 15lbs. Hopefully no news is good news, but I am going to send my info to Tom at TScomp to get my car up to speed when I get going with parts.
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Old Apr 2, 2016, 12:01 PM
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Anyone ever solve this ?
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Old Dec 28, 2017, 07:37 AM
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Was this issue solved?
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Old Apr 1, 2018, 05:52 PM
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Having the same problem. Can anyone confirm if the boomba TB has a biss like screw to adjust idle?
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