LS3 Rough Idle - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

luis nunez · 08-12-2010, 09:39 PM

Hello

I am still in doubt about the "normal rough idle" on the LS3, could this be related?

Thanks

#PI0090A: Intermittent Engine Hesitation or Flutter
without DTC (Inspect and Correct Intake Camshaft
Position (CMP) Sensor Bank 1 Connector Terminals for
Intermittent Conditions or Poor Connections) - (May
11, 2010)
Subject: Intermittent Engine Hesitation or Flutter Without DTC
(Inspect and Correct Intake Camshaft Position (CMP)
Sensor Bank 1 Connector Terminals for Intermittent
Conditions or Poor Connections

Condition/Concern
Some customers may comment on an intermittent engine hesitation or flutter.
This condition may be caused by the intake camshaft position (CMP) sensor bank 1 connector
terminals having intermittent conditions or poor connections. This will result in the engine control
module (ECM) temporarily being unable to determine engine position and it will stop fueling and
sparking. The ECM will require at least one engine revolution to resynchronize (resync) and if it
does, it will not set a DTC

SILVER BULLITT · 08-13-2010, 01:36 AM

acuraelin · 08-13-2010, 02:13 AM

I feel that when my car is 200 mile, now it's 1200 miles should i take it to GM?

Russell James · 08-13-2010, 07:22 AM

Not related. They just idle rough as the nature of the beast. Plus, the motor mounts are the consistency of jello, so a little engine shake is more noticeable with the engine flopping around on such soft mounts.

That would be an intermittent problem in the bulletin. The rough idle is there all the time.

Albion · 08-13-2010, 11:06 AM

Thanks for putting my only fears (so far),to bed.Owning a new 1ss in the U.K. is rather a long way from my dealer,in the US.

Injen Technology · 08-13-2010, 11:57 AM

If this makes anyone feel any better...all the 2009-2010 Silverado, Tahoe, Yukons etc. with the V8 5.3L, 6.0L, 6.2L we had in here had the same rough idle as the Camaro V8 LS3

SS 376 · 08-13-2010, 12:07 PM

Quote:

Originally Posted by Russell James

Not related. They just idle rough as the nature of the beast. Plus, the motor mounts are the consistency of jello, so a little engine shake is more noticeable with the engine flopping around on such soft mounts.

That would be an intermittent problem in the bulletin. The rough idle is there all the time.

I think this is right. It's a big motor and the stock cam is slightly big. Lots of people here have mistaken the rough idle for an actual issue.

A pronounced stutter on acceleration would be a different story, I think.

SSPower · 08-13-2010, 12:30 PM

Quote:

Originally Posted by Injen Technology

If this makes anyone feel any better...all the 2009-2010 Silverado, Tahoe, Yukons etc. with the V8 5.3L, 6.0L, 6.2L we had in here had the same rough idle as the Camaro V8 LS3

Actually my 09 Silverado runs very smooth...no rough idle what so ever.

ZAPSSRS · 08-13-2010, 12:35 PM

After you put your cam in you will not think about it anymore!

OUTATIME · 08-13-2010, 12:37 PM

The only thing I've noticed is a slight twitch at idle every now and then from the engine, otherwise it's been pretty smooth. Is that normal?

oakaro68 · 08-13-2010, 01:34 PM

sounds pretty consistent to me. mine does that too. it's nice to read everyone else's does too

*Milk 1027* · 08-15-2010, 04:49 PM

Quote:

Originally Posted by IndeedSS

I crawled under the car to have a look at the connector. The first thing I did was push on the connector and I heard a click.

Apparently this wasn't properly installed from the factory.

Anyway I went ahead and removed the connector and looked at the pins on the sensor and connector. Everything looked fine as did the mounting bolt.

Thanks for posting this. Hopefully the very sporadic rough idle issue is gone for my car.

Can you take a picture of the connector you are talking about?

Crossmanj21 · 01-11-2011, 09:46 PM

So this is only for the v6 LLT engine? I was hoping it was relevant to my LS3 but I checked it out and it did not seem loose. It looks like I would have to drop the starter in order to disconnect the plug and get a good look at it. Should I drop the starter and check it out?

toilets · 06-21-2011, 11:54 AM

Does someone have a better picture of exactly where this is?

intake CMP sensor bank 1.

08-13-2010, 01:36 AM	#2
SILVER BULLITT Drives: 2010 SIM 2SS/RS MONSTER Join Date: Aug 2009 Location: LOS ANGELES Posts: 1,506 View My Garage	__________________ HP MONSTER' SOUTHERN CALIFORNIA BUILT, LMR CAI, CUSTOM GRIND CAM, CUSTOM BUILT CNC PORTED AND POLISHED HEADS, FAST 102MM INTAKE MANIFOLD,ARH LONG TUBES AND HIGH FLOW CATS, BIGGER INJECTORS, VALVES SPRINGS RETAINERS, MGW SHORT SHIFTER, EIBACH SPRINGS, FACTORY CHROMED WHEELS, BLACKED OUT EMBLEMS, BLACKED OUT ROOF,BLACKED OUT MARKERS, 3.5 INCH ELECTRONIC CUTOUTS, FLOWMASTERS, ZEX WET 150 SHOT, FOR A GRAND TOTAL OF =630 REAR WHEEL TORQUE ,AND 600 REAR WHEEL HORSEPOWER MY JOURNALhttp://www.camaro5.com/forums/showth...02#post2023802 SOON TWIN TURBO SETUP

08-13-2010, 12:35 PM	#9
ZAPSSRS Drives: 2010 Camaro SS/RS Join Date: Mar 2010 Location: Fayetteville, GA Posts: 135	After you put your cam in you will not think about it anymore! __________________ Kooks LT 1 7/8 Catted Headers / Kooks Full Exhaust, Roto-Fab CAI / Radiator Cover / Engine Covers, Billet Engine Bay Accesories, Hurst Shifter, Heritage Grill, Vengeance Stage II Cam / Tune, Eibach Coils, G2 Painted Calipers, Tinted Windows

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08-13-2010, 02:13 AM	#3
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08-13-2010, 11:06 AM	#5
Albion Drives: IOM 1ss Join Date: Nov 2008 Location: united kingdom Posts: 222	Thanks for putting my only fears (so far),to bed.Owning a new 1ss in the U.K. is rather a long way from my dealer,in the US.

08-13-2010, 11:57 AM	#6
Injen Technology Drives: Camaro Join Date: Jul 2010 Location: Pomona, CA Posts: 47	If this makes anyone feel any better...all the 2009-2010 Silverado, Tahoe, Yukons etc. with the V8 5.3L, 6.0L, 6.2L we had in here had the same rough idle as the Camaro V8 LS3

08-13-2010, 12:37 PM	#10
OUTATIME Drives: 2010 IOM 2SS/RS Join Date: Oct 2008 Location: NJ Posts: 633	The only thing I've noticed is a slight twitch at idle every now and then from the engine, otherwise it's been pretty smooth. Is that normal?

08-13-2010, 01:34 PM	#11
oakaro68 Drives: 2015 Camaro Z/28 Join Date: Aug 2010 Location: San Antonio, TX Posts: 410 View My Garage	sounds pretty consistent to me. mine does that too. it's nice to read everyone else's does too

01-11-2011, 09:46 PM	#13
Crossmanj21 Drives: 2011 2SS/RS & 1986 GMC Sierra Join Date: Apr 2009 Location: Poulsbo, WA Posts: 17 View My Garage	So this is only for the v6 LLT engine? I was hoping it was relevant to my LS3 but I checked it out and it did not seem loose. It looks like I would have to drop the starter in order to disconnect the plug and get a good look at it. Should I drop the starter and check it out?

06-21-2011, 11:54 AM	#14
toilets Drives: 2010 camaro Join Date: May 2011 Location: Southeast, Posts: 842	Does someone have a better picture of exactly where this is? intake CMP sensor bank 1.