Cold start and idle problems with aftermarket throttlebody/ intake mani

NosydneW

Member +
I'm running a bigger intake manifold and bigger aftermarket throttle body which doen't have the intake air control valve fitted on the bottem.

I had to do acustom job to fit the oem TPS.

Problem is....
Car won't idle on cold start until engine is warmed up.can won't rev smoothly pass 2k rpm.
At 2k rpm it will start hunting. If TPS is disconnected it will rev smooth over 2k rpm.

using a standard Ecu to run in the engine.

How did you guys with bigger throttle body solve this problem ?
 

weeJohn

Lifer
Most use an aftermarket ecus with facilities to allow for more air during a cold start. You could try and make up something that uses the wax stat and idle control valve, bypass the throttle plate with a few hoses, bit of work in that but lol.
 

NosydneW

Member +
i have a Apexi Power FC to be fitted when engine is ready to be tuned but don't know if the apexi has that feature ?!?!

I was planning to try something like that tho,... using the iacv with some hoses but it needs water plus air.. and trhottle plate will be a difficult task to avoid.
 

weeJohn

Lifer
It does, it has timing and fueling adjustment for temps from -20 to 80 degrees Celsius, needs the Universal software to access the settings, you cant do it from a commander.
 

NosydneW

Member +
I have the complete Apexi power FC package including datalogit so maybe after tuning it will be better. I just thought that there must be a rpm vs temp adjustment option to fix this problem
 
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