Stalling at idle after startup (see logs)

[Eazy-V]

I've been having an issue with the car stalling at idle shortly after startup, but it seems to only happen during warm startups. If the car has not been started for a few hours and is cold, then startup and idle is fine.

I've made 2 EcuTek logs .csv, so can someone check those and provide an insight as to why this might be happening?

Also, very rarely does is save itself from stalling and if I rev the car a few times is seems to then idle normal without stalling.

- RaceROM version: 24256

[tomm.brz]

Much better if you upload your logs on Datazap.me
so everyone can see them


Can t really help you, anyway I see a huge heat soak... coolant more than 100°C , air intake more than 60°C... really rich afr too
did you run you car hard and then suddenly turned it off? maybe your tune doesnt run the radiator fan in a efficient way for your turbo mods....

[FRS Justin]

Who tuned the car

[Eazy-V]

Originally Posted by FRS Justin

Who tuned the car

A local tuner/shop

[Eazy-V]

Originally Posted by tomm.brz

Much better if you upload your logs on Datazap.me
so everyone can see them


Can t really help you, anyway I see a huge heat soak... coolant more than 100°C , air intake more than 60°C... really rich afr too
did you run you car hard and then suddenly turned it off? maybe your tune doesnt run the radiator fan in a efficient way for your turbo mods....

No, was just crusing before didn’t even do WOT

[FRS Justin]

The easy fix is call delicious tuning and order a tune. they are spot on.. but most likely the tuner who tuned your car did not sync the di with the pi they HAVE TO BE calibrated together.......

[Eazy-V]

Originally Posted by FRS Justin

The easy fix is call delicious tuning and order a tune. they are spot on.. but most likely the tuner who tuned your car did not sync the di with the pi they HAVE TO BE calibrated together.......

Thanks for the info, so what that affect cold start? The issue doesn’t occur on cold start and only warm start.

[steve99]

Have a look at the maf offset after start tables

[FRS Justin]

Steve is on to something also that could cause the issue. The reason the inj have to be syncd is when it switches between the pi/di the transition has to be smooth. if you have the scaling off one will be dropping a measured amount then switch to a different amout and the ecu/motor cant understand whats happening try to compensate and stall

[Eazy-V]

Thanks for the info, will look into those.

I want to add that if I rev the car/save it from stalling 3-5 times, it will then not stall again for that drive cycle. Also, I have a ACT prolite flywheel, so not sure if that is affecting it since I can’t remember when the issue first arose.

[steve99]

Originally Posted by Eazy-V

Thanks for the info, will look into those.

I want to add that if I rev the car/save it from stalling 3-5 times, it will then not stall again for that drive cycle. Also, I have a ACT prolite flywheel, so not sure if that is affecting it since I can’t remember when the issue first arose.

get the car going and let it idle for a few minutes


Check the AFR should be around 14.7
Check Long term Fuel trims if not disables should be below 10%
Check idle vacuum should be around -20inHg or -9 psi


If trims way high or idle vacuum low then you likely got intake or exhaust leak


Check catch cans , brake booster, pcv valves , bov and all vaccumm lines and the evap purge solenoid

[Eazy-V]

Originally Posted by steve99

get the car going and let it idle for a few minutes


Check the AFR should be around 14.7
Check Long term Fuel trims if not disables should be below 10%
Check idle vacuum should be around -20inHg or -9 psi


If trims way high or idle vacuum low then you likely got intake or exhaust leak


Check catch cans , brake booster, pcv valves , bov and all vaccumm lines and the evap purge solenoid

In cold start at idle all AFR, STFT, LTFT, vacuum pressure all settle to normal. On warm start, car dies unless I save it a few times with slight throttle then it idles and all those same values setting to normal.

[Eazy-V]

The plot thickens...

When I was testing WOT it would bog down like a fuel or boost cut at 10-11psi. I tried it again and same thing. No CEL or error codes during this, but I do get random Too Rich Left Bank 1 code P0172 when car dies during idling. The boost controller settings are the same since last Dec which have boost cut off at 13.5psi and I tried raising that to 17psi too.

Now, here’s what makes this even more weird, the issue above only started after I replaced a dying battery a week ago, but the idle stall issue was occurring for a while.

[guybo]

what injectors are you running?