follow ft86club on our blog, twitter or facebook.
FT86CLUB
Ft86Club
Speed By Design
Register Garage Members List Calendar Search Today's Posts Mark Forums Read

Go Back   Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB > Technical Topics > Issues | Warranty | Recalls / TSB

Issues | Warranty | Recalls / TSB Problems, issues, recalls, TSBs


User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-27-2021, 06:27 PM   #1
jpCrayola
Junior Member
 
Join Date: Jan 2020
Drives: 2018 Toyota GT86
Location: Riverside, CA
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Hesitation and Misfire after 4K RPM Under Boost

2018 Toyota 86

Parts:
- SBD G500x Turbo Kit
- Mishimoto Oil Cooler
- MXP Comp RS Exhaust

I recently just got my car back this month after getting into a minor fender bender. After I got it back, I went for a drive and tried to do a WOT, but it started hesitating and stuttering after 4K RPM. The CEL would start flashing. On idle, the car runs smoothly and has no issues. When I drive normally under 4K RPM, there are no hesitation issues at all. The body shop told me they didn't touch the engine or drive it anywhere except for to the paint shop, so I don't think they could have done anything. Before the accident, I was driving the car perfectly fine though, no issues. I guess sitting in a body shop for a month may have caused this issue? I'm not sure...

I took the car to my mechanic and they told me they noticed the hesitation issue and suggested that I may need to upgrade my fuel pump and fuel injectors to compensate for more air coming into the car. My mechanic did a compression test in cylinder #2 and they did not find low compression. Marin from Marin Tuned told me that my car was getting plenty of fuel and that upgrading my fuel injectors/pump was not necessary.

I talked to my tuner (James from HRI) and the only thing he has suggested so far is to diagnose if it is a coil pack, and replace the spark plugs.

I plugged my ECUTEK into my car and got the P0302 code.

1) I swapped out the old spark plugs with new OEM spark plugs on all 4 cylinders

2) I checked to see if it was a coil pack issue by switching coil pack #2 with coil pack #4, but it still showed the same misfire on cylinder #2

3) I checked to see if it was a fuel injector issue by switching the fuel injectors on the rail on the driver's side of the car, but it still showed the same misfire on cylinder #2

4) I checked if any hoses popped out or for any leaks

I have considered that the DI seals may potentially be the issue, but I am not experiencing any popping noises when I drive. Maybe the wiring for the port injector is faulty? I am running out of solutions and don't know what to do anymore. I don't think it's clutch slip either because once I go WOT past 4K RPM, it goes up very slowly.


Does anyone know how I can fix this or if anyone knows places in Southern California that could help me out with this?

It would be much appreciated!

https://datazap.me/u/jpcrayola/log-1611729147
jpCrayola is offline   Reply With Quote
Old 01-31-2021, 10:42 PM   #2
Icecreamtruk
Senior Member
 
Join Date: Dec 2015
Drives: Track preped NA FRS
Location: Montreal, Canada
Posts: 977
Thanks: 1,045
Thanked 675 Times in 402 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
P0302 if accompanied by actual power loss and felt missfires (you can hear the engine sputtering and struggling to rev) are actual missfires and not something else (like clutch slipping or anything elsewhere in the driveline). Missfires are actually quite simple, you need spark, fuel and compression to be right to not have any. You said you changed the sparkplugs by new ones, so those are out. You swapped port injectors and coilpacks around and issue still pops on cylinder 2. So only 2 more things to check remain. Your direct injector in cylinder 2 is having problems (injector itself, seal, or both), or your compression is out of whack on cylinder 2 (headgasket, or something in the cylinder or piston). Start by taking both injectors out of that side and compare them, if they look normal swap them like you did port injectors and see if its still there. If its still missfire you have a deeper problem that may require you to actually open up the engine. Usually this is not the case on FA20s, but you are boosted so Im leaning on your head gasket or compression being out of whack from an internal damaged, but I hope im wrong and its just an injector seal.
Icecreamtruk is offline   Reply With Quote
Old 01-31-2021, 11:03 PM   #3
DarkPira7e
Yes, my car does run!
 
DarkPira7e's Avatar
 
Join Date: Feb 2017
Drives: 2013 Turbo Firestorm FRS
Location: Vermont
Posts: 3,439
Thanks: 2,649
Thanked 3,386 Times in 1,723 Posts
Mentioned: 27 Post(s)
Tagged: 0 Thread(s)
Is it possible that your car was low on gas and they filled it with low octane?
Should show up as knock, but who knows..
__________________
Turbo FR-S Build - Build Thread
JDL EL Recirc manifold, Boostlab BL58x Turbo w/ T51R, 17x9 ARC-8, IAG block
DarkPira7e is offline   Reply With Quote
Old 02-02-2021, 11:16 PM   #4
tomm.brz
Senior Member
 
Join Date: Jan 2017
Drives: brz 2017 hksv2
Location: italy
Posts: 1,810
Thanks: 420
Thanked 778 Times in 592 Posts
Mentioned: 44 Post(s)
Tagged: 0 Thread(s)
check grounds, specially on the DI ECU near fuse box
tomm.brz is offline   Reply With Quote
Old 02-03-2021, 12:11 AM   #5
jpCrayola
Junior Member
 
Join Date: Jan 2020
Drives: 2018 Toyota GT86
Location: Riverside, CA
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
yeah, i think DI seals might be the case. im taking it to HG performance next tuesday to get it fixed.
jpCrayola is offline   Reply With Quote
 
Reply

Tags
hesitation, misfire, p0302, sbd, turbo

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Frs Misfire on boost chuckdest Forced Induction 24 05-16-2021 02:06 AM
Hesitation/Misfire under boost mcrane Forced Induction 30 07-19-2018 07:07 AM
Digital boost gauge w/ vent pod grim speed boost controller Meetjoeblack Engine, Exhaust, Bolt-Ons 0 03-09-2015 01:27 PM
RPM hesitation on WOT? Yamajee Issues | Warranty | Recalls / TSB 8 01-10-2015 12:43 PM


All times are GMT -4. The time now is 04:19 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
User Alert System provided by Advanced User Tagging v3.3.0 (Lite) - vBulletin Mods & Addons Copyright © 2022 DragonByte Technologies Ltd.

Garage vBulletin Plugins by Drive Thru Online, Inc.