2010 L99 falls on its face - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Denis · 07-20-2016, 08:27 AM

Alright so here's the situation, 2010 SS L99 with about 116,000 on the clock. ADM race intake, Apex scoop, Apex Catch Can, TSP long tubes, catless mids, strong MAF, JRE tune.

Every so often, and I mean like 3 times a year maybe, when I come to a quick stop and go like a yield sign or a stop sign and realize there's no cars so I accelerate very shortly after coming to a stop, the car just loses power. I mean no throttle at all. its for long enough that I can hit the pedal a few times and check my gauges before the car returns to normal and I can accelerate again. Any idea what the hell could cause this?

I hope that description makes sense. Its kind of alarming when pulling out into traffic and you suddenly have no power.

Pace · 07-20-2016, 08:33 AM

Try it without traction control...and of course be careful.

Maybe a ported throttle body may help?

ClawSS · 07-20-2016, 08:35 AM

3 times a year....ooof on the re-creation, but I would bet Jannety would love a log of the event. I assume you may have an SCT or something. I vote either TCU or ECU hiccup due to all kinds of possible sensor readings of downshift, upshift, speed, braking, torque mgt, and throttle position. Just MHO. I did stay at a Holiday Inn Express the other night.

mmaattppllaayy · 07-20-2016, 08:35 AM

Possibly a throttle body issue. Motor may be going going out.

Quote:

Originally Posted by Denis

Alright so here's the situation, 2010 SS L99 with about 116,000 on the clock. ADM race intake, Apex scoop, Apex Catch Can, TSP long tubes, catless mids, strong MAF, JRE tune.

Every so often, and I mean like 3 times a year maybe, when I come to a quick stop and go like a yield sign or a stop sign and realize there's no cars so I accelerate very shortly after coming to a stop, the car just loses power. I mean no throttle at all. its for long enough that I can hit the pedal a few times and check my gauges before the car returns to normal and I can accelerate again. Any idea what the hell could cause this?

I hope that description makes sense. Its kind of alarming when pulling out into traffic and you suddenly have no power.

arkentect · 07-20-2016, 08:43 AM

is there any drop in rpm past idle?

Denis · 07-20-2016, 11:39 AM

its so hard to predict that its almost impossible to get a log of it haha.

i havent noticed it dropping below idle but ill try and pay closer attention to it next time.

ClawSS · 07-20-2016, 12:07 PM

Have you ever tried to reproduce it...force the scenario on an open deserted road?

arkentect · 07-20-2016, 02:02 PM

Quote:

Originally Posted by Denis

its so hard to predict that its almost impossible to get a log of it haha.

i havent noticed it dropping below idle but ill try and pay closer attention to it next time.

With no apparent rpm drop below normal levels you can rule out a misfire/fuel starvation. Definitely sounds like the drive by wire system has an issue.

Orange 2010 Camaro · 07-20-2016, 03:06 PM

Quote:

Originally Posted by arkentect

With no apparent rpm drop below normal levels you can rule out a misfire/fuel starvation. Definitely sounds like the drive by wire system has an issue.

When was the last time the spark plugs were replaced? At 116 thousand miles I would also run compression checks on all of the cylinders as well.
It sounds to me that it is probably an intermittent electrical gremlin that can be hard to trace.

All The Beast,

Orange 2010 Camaro

chuckie669 · 07-20-2016, 03:25 PM

Isn't there a decel fuel cut off? Like it's made to go lean?

Denis · 07-21-2016, 05:59 AM

Quote:

Originally Posted by ClawSS

Have you ever tried to reproduce it...force the scenario on an open deserted road?

That's my next step.

Quote:

Originally Posted by arkentect

With no apparent rpm drop below normal levels you can rule out a misfire/fuel starvation. Definitely sounds like the drive by wire system has an issue.

yea I mean literally during the event I have zero throttle control.

Quote:

Originally Posted by Orange 2010 Camaro

When was the last time the spark plugs were replaced? At 116 thousand miles I would also run compression checks on all of the cylinders as well.
It sounds to me that it is probably an intermittent electrical gremlin that can be hard to trace.

All The Beast,

Orange 2010 Camaro

I replaced them about 10 thousand miles ago actually. OE replacement AC Delcos. as far as compression, the car runs and pulls strong. I have no horsepower loss.

Quote:

Originally Posted by chuckie669

Isn't there a decel fuel cut off? Like it's made to go lean?

no idea on that one.

MattSS · 07-21-2016, 03:50 PM

hm... i have issues in those circumstances once in a while as well, but not a lack of throttle. mine bucks and surges on occasion after a short stop/go event. Only way to settle it down is coast for a few seconds or outright floor it. One generally leaves me sitting in the middle of a road staring down oncoming traffic and the other roasts the tires and makes me look like a moron. I always figured it was an airflow/throttle control issue.

chuckie669 · 07-21-2016, 04:25 PM

Im not sure how factual this all is. I just remember reading about dfco from several articles on c5 including this one from this dsx person.

http://www.camaro5.com/forums/showthread.php?t=153362

thebanks06 · 07-21-2016, 08:30 PM

Had similar problem with my 2010. It was the throttle body.

07-20-2016, 08:27 AM	#1
Denis Drives: 2010 SS Join Date: May 2012 Location: Yorktown Heights, NY Posts: 7,695 View My Garage	2010 L99 falls on its face Alright so here's the situation, 2010 SS L99 with about 116,000 on the clock. ADM race intake, Apex scoop, Apex Catch Can, TSP long tubes, catless mids, strong MAF, JRE tune. Every so often, and I mean like 3 times a year maybe, when I come to a quick stop and go like a yield sign or a stop sign and realize there's no cars so I accelerate very shortly after coming to a stop, the car just loses power. I mean no throttle at all. its for long enough that I can hit the pedal a few times and check my gauges before the car returns to normal and I can accelerate again. Any idea what the hell could cause this? I hope that description makes sense. Its kind of alarming when pulling out into traffic and you suddenly have no power. __________________

07-20-2016, 08:33 AM	#2
Pace Lifestyle = Deathstyle Drives: 11 SIM 2SS/RS Join Date: Mar 2010 Location: Long Island, NY Posts: 686	Try it without traction control...and of course be careful. Maybe a ported throttle body may help? __________________ 11 2SS/RS

07-20-2016, 08:35 AM	#3
ClawSS High-tech Redneck Drives: '10 CGM SS, '02 2500HD, '09 300SRT8 Join Date: Nov 2010 Location: Lexington, KY Posts: 757	3 times a year....ooof on the re-creation, but I would bet Jannety would love a log of the event. I assume you may have an SCT or something. I vote either TCU or ECU hiccup due to all kinds of possible sensor readings of downshift, upshift, speed, braking, torque mgt, and throttle position. Just MHO. I did stay at a Holiday Inn Express the other night. __________________ "My friends call me Chris. Are you my friend?" 2010 CGM L99 2SS/RS - GPI SS3 VVT, BTR DoD Delete, Circle D 4c, BTR springs, Katech C5R Timing Chain, MRR-228 315/275, CAI, Elite catch-can, TSP 1 7/8" Headers + offroad pipes, Magnaflow 3", Pfadt springs, BMR LCAs, toelinks, trailing arms, cradle bushings, & sway bars w/ endlinks, Vitesse paddles, heritage grille, and an eBay splitter. Power upgrades by Race Proven Perf.; Tuning by ShorTuning.

07-20-2016, 08:43 AM	#5
arkentect Drives: 2010 Camaro SGM 1LT M6 Join Date: Jan 2015 Location: Rochester, NY Posts: 1,630	is there any drop in rpm past idle? __________________ Arkentect's Build Thread!! - UPSTATE C5 MEMBER 2010 SGM M6 1LT - SOLD Current - 2009 C6 Corvette Z51

07-20-2016, 11:39 AM	#6
Denis Drives: 2010 SS Join Date: May 2012 Location: Yorktown Heights, NY Posts: 7,695 View My Garage	its so hard to predict that its almost impossible to get a log of it haha. i havent noticed it dropping below idle but ill try and pay closer attention to it next time. __________________

07-20-2016, 12:07 PM	#7
ClawSS High-tech Redneck Drives: '10 CGM SS, '02 2500HD, '09 300SRT8 Join Date: Nov 2010 Location: Lexington, KY Posts: 757	Have you ever tried to reproduce it...force the scenario on an open deserted road? __________________ "My friends call me Chris. Are you my friend?" 2010 CGM L99 2SS/RS - GPI SS3 VVT, BTR DoD Delete, Circle D 4c, BTR springs, Katech C5R Timing Chain, MRR-228 315/275, CAI, Elite catch-can, TSP 1 7/8" Headers + offroad pipes, Magnaflow 3", Pfadt springs, BMR LCAs, toelinks, trailing arms, cradle bushings, & sway bars w/ endlinks, Vitesse paddles, heritage grille, and an eBay splitter. Power upgrades by Race Proven Perf.; Tuning by ShorTuning.

07-20-2016, 03:25 PM	#10
chuckie669 Drives: 2011 ss Join Date: Sep 2015 Location: E-TX Posts: 764	Isn't there a decel fuel cut off? Like it's made to go lean?

07-21-2016, 03:50 PM	#12
MattSS Drives: 2010 2SS/RS A6 CGM Join Date: Jul 2010 Location: Central Illinois Posts: 103	hm... i have issues in those circumstances once in a while as well, but not a lack of throttle. mine bucks and surges on occasion after a short stop/go event. Only way to settle it down is coast for a few seconds or outright floor it. One generally leaves me sitting in the middle of a road staring down oncoming traffic and the other roasts the tires and makes me look like a moron. I always figured it was an airflow/throttle control issue. __________________ ------------------------------------------------ Mods: Heritage Grille, '69 SS emblem in grille, CAI intake, ADM scoop, vMax PTB, Kooks LT headers w/ HF Cats, Solo Mach-XL cat back

07-21-2016, 04:25 PM	#13
chuckie669 Drives: 2011 ss Join Date: Sep 2015 Location: E-TX Posts: 764	Im not sure how factual this all is. I just remember reading about dfco from several articles on c5 including this one from this dsx person. http://www.camaro5.com/forums/showthread.php?t=153362

07-21-2016, 08:30 PM	#14
thebanks06 Drives: 2016 Chevy Camaro 2SS Join Date: Aug 2012 Location: Atlanta, GA Posts: 289	Had similar problem with my 2010. It was the throttle body.