Car is stalling on start after Intake+header and a tune install. - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

WinterWolf · 10-01-2019, 10:45 AM

Hey guys, I'm currently working on my GF's car to get it a bit more power, but I've run into this issue and I can't quite figure out what's going on. I'll admit this build has had more issues than I expected as I ran this same setup on my car prior to boost.

1. Installed JDL UEL (Catless) Header
2. Installed Grimmspeed Intake
- Started car, everything seemed good, no leaks that I could smell.
3. Loaded Stage 2 Flex tune from Delicious
- Fuck up #1. The car didn't have the flex fuel kit fully installed as I ended up with the wrong sensor for the Dbox. So I left the stock rear O2 plugged in but apparently needed to have that unplugged.
- Went to the gas station, car behaving a bit weird. After getting gas it refused to start, Idle-sputter-die, ad nauseam. Towed back to my house and Bill got back to me letting me know I fucked up with the rear O2 as the car was looking for ethanol content that wasn't there. Unplugged it and it started and ran great.

NOW here's the thing - Entirely random, hot, cold, warm, whatever it will refuse to start a few times in a row. If you're persistent, taking the key out etc. It will eventually start and act like nothing happened. When got logs of this happening my tuner said the Front O2 sensor was not working for some reason. When I got logs of it running, he said everything looked great and on point.

Since then, I have
- replaced both the Front and Rear O2 Sensors (Rear was replaced during the header install due to stripping)
- Flashed the non-Flex Stage 2 tune from DT
- Installed the full Flex fuel kit
- Reflashed the FF Tune
- Followed the relearn Idle guide sent to me by Bill.

Just this morning after everything went smoothly while installing the kit and relearning idle last night my GF said it stalled again for her while trying to leave for work. (For clarity sake, the car is running and has run on 93 only.)

For the life of me I can't figure this out... help.

steve99 · 10-01-2019, 06:57 PM

If your on petrol , id flash a complelty stock tune to car and see if you still have peoblems. Just disconnect flex kit from rear 02 sensor and plug sensor back in.

Stock tune should run fine with grimspeed intake and catless header. You might trip P 0420 cel re cat efficiency and cruise control wont work. But car should not stall or thow other codes unless theors some hardware issue.

Make sure the maf sensor cable is plug in all the way. Check the DI computer has all 3 bolts tight. Check for intake leaks. Check both 02 sensors p!ugged in

When you say refues to start does engine crank ? Or no cranking

WinterWolf · 10-03-2019, 11:46 AM

Quote:

Originally Posted by steve99

When you say refues to start does engine crank ? Or no cranking

Sorry, that's my bad on word choice - The car starts but then immediately dies within about 2-3 seconds.

steve99 · 10-03-2019, 06:47 PM

Quote:

Originally Posted by WinterWolf

Sorry, that's my bad on word choice - The car starts but then immediately dies within about 2-3 seconds.

Check fhe DI computer is plugged in and is groumded via its mount bolts

Clutch Dog · 10-03-2019, 06:53 PM

is it only when cold? when the engine is hot does it cut out after start up? could be a weak battery/alt thing with bad spark..

WinterWolf · 10-04-2019, 09:42 AM

Quote:

Originally Posted by Clutch Dog

is it only when cold? when the engine is hot does it cut out after start up? could be a weak battery/alt thing with bad spark..

It's entirely random. Can happen in the morning, afternoon, hot or cold, though usually in between.

WinterWolf · 10-04-2019, 09:44 AM

Quote:

Originally Posted by steve99

Check fhe DI computer is plugged in and is groumded via its mount bolts

I'll give that a check though I can't imagine they are. They've never been touched.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Engine Stalling During Cold Start	Dylon	Issues \| Warranty \| Recalls / TSB	4	06-29-2019 01:05 PM
What is the recommended tune for header install?	Artxjr	Engine, Exhaust, Transmission	12	04-08-2019 04:00 PM
Calibrating my Stg1 tune after 4-1 EL header install	freerunner	Software Tuning	51	08-20-2018 01:38 PM
Car won't start after intake install	ajh88	Issues \| Warranty \| Recalls / TSB	23	01-30-2017 06:34 PM
Sluggish/Stalling After aFe Intake Install	FR-S Matt	Engine, Exhaust, Transmission	6	01-15-2013 09:57 PM

10-01-2019, 10:45 AM	#1
WinterWolf Member Join Date: Apr 2017 Drives: 2015 FR-S - Ultramarine Location: Cincinnati/Dayton - OH Posts: 12 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Car is stalling on start after Intake+header and a tune install. Hey guys, I'm currently working on my GF's car to get it a bit more power, but I've run into this issue and I can't quite figure out what's going on. I'll admit this build has had more issues than I expected as I ran this same setup on my car prior to boost. 1. Installed JDL UEL (Catless) Header 2. Installed Grimmspeed Intake - Started car, everything seemed good, no leaks that I could smell. 3. Loaded Stage 2 Flex tune from Delicious - Fuck up #1. The car didn't have the flex fuel kit fully installed as I ended up with the wrong sensor for the Dbox. So I left the stock rear O2 plugged in but apparently needed to have that unplugged. - Went to the gas station, car behaving a bit weird. After getting gas it refused to start, Idle-sputter-die, ad nauseam. Towed back to my house and Bill got back to me letting me know I fucked up with the rear O2 as the car was looking for ethanol content that wasn't there. Unplugged it and it started and ran great. NOW here's the thing - Entirely random, hot, cold, warm, whatever it will refuse to start a few times in a row. If you're persistent, taking the key out etc. It will eventually start and act like nothing happened. When got logs of this happening my tuner said the Front O2 sensor was not working for some reason. When I got logs of it running, he said everything looked great and on point. Since then, I have - replaced both the Front and Rear O2 Sensors (Rear was replaced during the header install due to stripping) - Flashed the non-Flex Stage 2 tune from DT - Installed the full Flex fuel kit - Reflashed the FF Tune - Followed the relearn Idle guide sent to me by Bill. Just this morning after everything went smoothly while installing the kit and relearning idle last night my GF said it stalled again for her while trying to leave for work. (For clarity sake, the car is running and has run on 93 only.) For the life of me I can't figure this out... help.

10-01-2019, 06:57 PM	#2
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,998 Thanks: 1,035 Thanked 4,988 Times in 2,982 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	If your on petrol , id flash a complelty stock tune to car and see if you still have peoblems. Just disconnect flex kit from rear 02 sensor and plug sensor back in. Stock tune should run fine with grimspeed intake and catless header. You might trip P 0420 cel re cat efficiency and cruise control wont work. But car should not stall or thow other codes unless theors some hardware issue. Make sure the maf sensor cable is plug in all the way. Check the DI computer has all 3 bolts tight. Check for intake leaks. Check both 02 sensors p!ugged in When you say refues to start does engine crank ? Or no cranking

10-03-2019, 06:53 PM	#5
Clutch Dog Senior Member Join Date: Jan 2019 Drives: 2017 BRZ PP , 2005 Saab 97X Location: CA Posts: 1,052 Thanks: 754 Thanked 721 Times in 405 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	is it only when cold? when the engine is hot does it cut out after start up? could be a weak battery/alt thing with bad spark..

User Name		Remember Me?
Password