Bad cold start 10:1 91 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

KeepItStock · 04-25-2022, 04:51 PM

i got a forged shortblock IAG stage 2 10:1 CR
with a hks v3 SC and some supertech valve springs

Since then my cold starts have been horrible my tuner is taking forever to get back to me

so now im giving the forum a try

fuel trims are +9ish until it goes to PI then it drops to +3ish
AFR are good 14.6 it jumps around a lil
my ignition timing is at -4.9 when its bad then when it figures itself out it will jump up to +13 - +14

ive also noticed when it does figure itself out the oil temp is at 100F

i have checked my vacuum lines under the manifold, pcv , and the one that goes to the solenoid

any input is appreciated

norcalpb · 04-25-2022, 04:57 PM

Hey you may want to try this in the technical section, you are in the classifieds right now.

thomasmryan · 04-25-2022, 05:33 PM

the prez version of subaru has a larger cat AND has a hellish timing retard on start up.

see if you coolant temperature sensor for the ecu is putting out the correct value.

04-25-2022, 04:51 PM	#1
KeepItStock Junior Member Join Date: May 2016 Drives: 16FRS hks SC 10:1 91 ecutek Location: Los Angeles Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Bad cold start 10:1 91 i got a forged shortblock IAG stage 2 10:1 CR with a hks v3 SC and some supertech valve springs Since then my cold starts have been horrible my tuner is taking forever to get back to me so now im giving the forum a try fuel trims are +9ish until it goes to PI then it drops to +3ish AFR are good 14.6 it jumps around a lil my ignition timing is at -4.9 when its bad then when it figures itself out it will jump up to +13 - +14 ive also noticed when it does figure itself out the oil temp is at 100F i have checked my vacuum lines under the manifold, pcv , and the one that goes to the solenoid any input is appreciated

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04-25-2022, 04:57 PM	#2
norcalpb Senior Member Join Date: Oct 2013 Drives: 2013 BRZ, 2023 Model 3 Location: SF Bay Area Posts: 2,345 Thanks: 1,256 Thanked 902 Times in 590 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Hey you may want to try this in the technical section, you are in the classifieds right now.

04-25-2022, 05:33 PM	#3
thomasmryan Senior Member Join Date: Jan 2016 Drives: hyper blue Location: east tn Posts: 406 Thanks: 169 Thanked 264 Times in 158 Posts Mentioned: 2 Post(s) Tagged: 2 Thread(s)	the prez version of subaru has a larger cat AND has a hellish timing retard on start up. see if you coolant temperature sensor for the ecu is putting out the correct value.

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