Hard lurch, don't know what it was - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

dave77 · 01-22-2014, 11:41 PM

My car is basically all stock. Was driving in traffic today. Stop and go kind of stuff. One time I start going from a stop in first. Right about when I let out the clutch, can't remember exactly when, there was a sudden lurch. First I thought I had hit a rock or some obstacle under my car which caused resistance. But there was nothing there.

It also felt like a sudden fuel cut off. But then right after everything got back to normal. It's not like I let the clutch out super fast or anything, just a normal start from zero.

IDK if it was just an "occasional thing" these engines do, or if it's a sign of some underlying issue that could get worse?

Any ideas or similar experiences?

Ganthrithor · 01-23-2014, 12:49 AM

Did you perhaps spin a wheel with TC on? Was there a nasty lump in the road that might have triggered the anti-hop function?

dave77 · 01-23-2014, 01:27 AM

Quote:

Originally Posted by Ganthrithor

Did you perhaps spin a wheel with TC on? Was there a nasty lump in the road that might have triggered the anti-hop function?

well I guess that's possible. I don't exactly remember any bump or hole in the road. it seemed smooth to me. The lurch/cutoff was so sudden and harsh, I was shocked. But ive never heard of the anti hop function...

EpicNameBro · 01-23-2014, 01:29 AM

I had a similar experience it's happened recently probably like 3 times randomly. I didn't think anything of at first but the fact that it happened more than twice has me cautious... no cel and none of the driver assist were off either...

humfrz · 01-23-2014, 01:34 AM

Quote:

Originally Posted by dave77

My car is basically all stock. Was driving in traffic today. Stop and go kind of stuff. One time I start going from a stop in first. Right about when I let out the clutch, can't remember exactly when, there was a sudden lurch. First I thought I had hit a rock or some obstacle under my car which caused resistance. But there was nothing there.

It also felt like a sudden fuel cut off. But then right after everything got back to normal. It's not like I let the clutch out super fast or anything, just a normal start from zero.

IDK if it was just an "occasional thing" these engines do, or if it's a sign of some underlying issue that could get worse?

Any ideas or similar experiences?

I've had something like that happen when the car is cold and I start off from a stop and I'm turning right.

I reckon it's just a quirk......

Evil Jesus · 01-23-2014, 01:45 AM

Mine does it once in a while as well. Feels kinda like how the car jumps off the throttle really quickly when you crest a hill in cruise control but much harder.

EpicNameBro · 01-23-2014, 01:51 AM

Yeah at first i didn't think much of it but 2 times in particular its been cold start but for the most part it has been while the car was warmed up... curious what the issue may be...

dave77 · 01-23-2014, 03:06 AM

interesting that others have had the same experience. kinda glad that in not the only one. mine was with the car warmed up, no driver aids turned off. I have about 5200 miles.

moojpg2 · 01-29-2014, 01:05 PM

My brz does it too sometimes. I think its just a quirk of the tc system when starting off if there are bumps or sand the tires want to chirp easily

Sent from my SCH-I535 using Tapatalk

Zach3794 · 01-29-2014, 02:24 PM

This used to happen to me before I figured out that my DW Fuel Pump was installed incorrectly. Whole thread about it

Could also be TC acting up like they said but if it's the pump, it's completely random and can force a fuel cut in any driving situation.

stugray · 01-29-2014, 02:34 PM

My two thoughts were:
1 - Were you runnning low on fuel? turning with nearly empty fuel can cause air to enter the FI system.

2 - A patch of ice (then I noticed "Miami").
My experince living in Fl from CO: If it gets below 55deg in Fl. the locals don artic parkas while the CO natives walk around in shorts...

EpicNameBro · 01-29-2014, 06:36 PM

Quote:

Originally Posted by stugray

My two thoughts were:
1 - Were you runnning low on fuel? turning with nearly empty fuel can cause air to enter the FI system.

2 - A patch of ice (then I noticed "Miami").
My experince living in Fl from CO: If it gets below 55deg in Fl. the locals don artic parkas while the CO natives walk around in shorts...

Neither of those have been the case for me as my car rarely sits below 3/4s empty... driving conditions are always good when it happens...

NickFRS · 01-30-2014, 04:53 AM

noticed you use this ram air intake. Maybe you should get a tune.

http://www.ft86club.com/forums/showthread.php?t=55447

Also noticed you hit something.

Get your front end checked out.

350matt · 01-30-2014, 01:03 PM

this soudns like the TC / VCS to me as the standard setting is very agressive - feel like someone has turned the engien off briefly

switch in to 'sport' and it should stop doing it

01-22-2014, 11:41 PM	#1
dave77 Big Member Join Date: Nov 2013 Drives: 2014 FR-S Location: Los Angeles Posts: 284 Thanks: 216 Thanked 91 Times in 56 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Hard lurch, don't know what it was My car is basically all stock. Was driving in traffic today. Stop and go kind of stuff. One time I start going from a stop in first. Right about when I let out the clutch, can't remember exactly when, there was a sudden lurch. First I thought I had hit a rock or some obstacle under my car which caused resistance. But there was nothing there. It also felt like a sudden fuel cut off. But then right after everything got back to normal. It's not like I let the clutch out super fast or anything, just a normal start from zero. IDK if it was just an "occasional thing" these engines do, or if it's a sign of some underlying issue that could get worse? Any ideas or similar experiences?

01-30-2014, 04:53 AM	#13
NickFRS Senior Member Join Date: Jun 2012 Drives: 2013 Asphalt FRS Location: Gladstone Posts: 1,450 Thanks: 899 Thanked 440 Times in 286 Posts Mentioned: 75 Post(s) Tagged: 0 Thread(s)	noticed you use this ram air intake. Maybe you should get a tune. http://www.ft86club.com/forums/showthread.php?t=55447 Also noticed you hit something. Get your front end checked out. __________________ 2013 Sion FRS 2014 Subaru WRX 2014 Subaru XV

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01-23-2014, 12:49 AM	#2
Ganthrithor Senior Member Join Date: Feb 2013 Drives: '13 BRZ, '06 997, Other Things(TM) Location: Santa Barbara, CA Posts: 1,078 Thanks: 1,715 Thanked 670 Times in 351 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Did you perhaps spin a wheel with TC on? Was there a nasty lump in the road that might have triggered the anti-hop function?

01-23-2014, 01:29 AM	#4
EpicNameBro Senior Member Join Date: May 2012 Drives: Slow... Location: Fightin' Child Support... Posts: 238 Thanks: 61 Thanked 85 Times in 63 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I had a similar experience it's happened recently probably like 3 times randomly. I didn't think anything of at first but the fact that it happened more than twice has me cautious... no cel and none of the driver assist were off either...

01-23-2014, 01:45 AM	#6
Evil Jesus Senior Member Join Date: Jan 2013 Drives: '13 FR-S Raven 6MT Location: Albany, NY Posts: 443 Thanks: 1,072 Thanked 200 Times in 135 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Mine does it once in a while as well. Feels kinda like how the car jumps off the throttle really quickly when you crest a hill in cruise control but much harder.

01-23-2014, 01:51 AM	#7
EpicNameBro Senior Member Join Date: May 2012 Drives: Slow... Location: Fightin' Child Support... Posts: 238 Thanks: 61 Thanked 85 Times in 63 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Yeah at first i didn't think much of it but 2 times in particular its been cold start but for the most part it has been while the car was warmed up... curious what the issue may be...

01-23-2014, 03:06 AM	#8
dave77 Big Member Join Date: Nov 2013 Drives: 2014 FR-S Location: Los Angeles Posts: 284 Thanks: 216 Thanked 91 Times in 56 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	interesting that others have had the same experience. kinda glad that in not the only one. mine was with the car warmed up, no driver aids turned off. I have about 5200 miles.

01-29-2014, 01:05 PM	#9
moojpg2 Member Join Date: Jan 2014 Drives: Posts: 23 Thanks: 0 Thanked 8 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	My brz does it too sometimes. I think its just a quirk of the tc system when starting off if there are bumps or sand the tires want to chirp easily Sent from my SCH-I535 using Tapatalk

01-29-2014, 02:24 PM	#10
Zach3794 Senior Member Join Date: Mar 2013 Drives: 2013 Scion FR-S, Raven, Manual Location: Vista, CA Posts: 396 Thanks: 81 Thanked 143 Times in 101 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	This used to happen to me before I figured out that my DW Fuel Pump was installed incorrectly. Whole thread about it Could also be TC acting up like they said but if it's the pump, it's completely random and can force a fuel cut in any driving situation.

01-29-2014, 02:34 PM	#11
stugray Banned Join Date: Sep 2013 Drives: 2013 GBS BRZ Limited Location: Colorado Posts: 1,925 Thanks: 627 Thanked 1,445 Times in 711 Posts Mentioned: 41 Post(s) Tagged: 0 Thread(s)	My two thoughts were: 1 - Were you runnning low on fuel? turning with nearly empty fuel can cause air to enter the FI system. 2 - A patch of ice (then I noticed "Miami"). My experince living in Fl from CO: If it gets below 55deg in Fl. the locals don artic parkas while the CO natives walk around in shorts...

01-30-2014, 01:03 PM	#14
350matt Senior Member Join Date: Jul 2013 Drives: toyota mr2/ Toyota GT86 Location: UK Posts: 438 Thanks: 3 Thanked 140 Times in 92 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	this soudns like the TC / VCS to me as the standard setting is very agressive - feel like someone has turned the engien off briefly switch in to 'sport' and it should stop doing it

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