Will not idle when cold

[Kris86]

Hey guys, been getting hit with every single thing in the books with this build still here trying to iron things out, got my low vacuum issue sorted out, turned out to be the GDI injector seals issue now is, when doing a cold start, the engine fires up right away but would not idle.. I can keep my foot on the throttle until it warms up some until you can hear it come out of the cold start map and then it would idle perfectly.

[Turdinator]

What mods and tune are you running? Does the car drive fine once its up to temp?

[steve99]

Originally Posted by Kris86

Hey guys, been getting hit with every single thing in the books with this build still here trying to iron things out, got my low vacuum issue sorted out, turned out to be the GDI injector seals issue now is, when doing a cold start, the engine fires up right away but would not idle.. I can keep my foot on the throttle until it warms up some until you can hear it come out of the cold start map and then it would idle perfectly.

Ill assume that cold startup is only issue and car runs ok after that and new injectors are scaled and latency is set up.


Car starts on port injection only.


During the cold start routine the fueling is richened via the "maf offset after start" table.


also reduce the post start ignition timing from -15 to say -6


Log you AFR and if its getting to rich maybe decrease the offsets in the table

[Kris86]

Originally Posted by Turdinator

What mods and tune are you running? Does the car drive fine once its up to temp?

Hey, I've got this issue ever since I rebuilt my engine and went with a turbo kit.

dw 900cc injectors, FBM 485 pump kit.

Once the car warms up and comes out of the "warm up map" it will idle perfectly smooth, once warm enough I can also lock it off and it starts back just fine.

I'm currently doing customs remote tuning with my tuner

[Kris86]

Originally Posted by steve99

Ill assume that cold startup is only issue and car runs ok after that and new injectors are scaled and latency is set up

Hey Steve thanks for ur reply,

I could pass ur message onto my tuner, just hope I won't come across rude to them as if I don't have faith in them

[steve99]

Originally Posted by Kris86

Hey Steve thanks for ur reply,

I could pass ur message onto my tuner, just hope I won't come across rude to them as if I don't have faith in them

double check for leaks on intake and exhaust side especially bov. small leaks have most effect at idle ans low rpm