LFX off idle stumble/throttle response - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

cohocarl · 04-13-2016, 06:52 AM

I couldn't find anything here regarding the off idle throttle response I have on my '15 1LS, and wondering if is the nature of the beast, or just mine....

During normal driving, I have no complaints, although when it is coming off idle, there is a little hesitation. If it had a carb, I'd say it's too lean at idle.
It's a bone stock 6-speed with less than 2K miles on it. Just got it back out of hibernation yesterday, but it was like that since new, and does not seem to be the inherent lag of the electronic throttle.

Just curious.

Thanks,

Carl

IneedAZ · 04-13-2016, 07:01 AM

Both Aftermarket throttle bodies and pedal controllers have shown to help this. As far as throttle bodies, there are now 2 options. Ported 72mm size or the new 80mm. There are a few different pedal controllers on the market now. I am using the VTC as it was one of the first to appear for the Camaro on this site.

Shawno72 · 04-13-2016, 08:29 AM

What he said ^

cohocarl · 04-13-2016, 02:19 PM

Quote:

Originally Posted by Shawno72

What he said ^

Ok, thanks for the replies.

I was kind of concerned I may have a problem with mine, but it sounds like it's a common issue.

Elite Engineering · 04-13-2016, 02:23 PM

Pull your intake manifold and inspect your intake valves. Your symptoms are common to indicate the level of coking has reached the point of disrupting initial air flow into the cylinders. You have a GDI engine and intake valve coking is a pretty severe issue. You will want to perform a manual intake valve cleaning (NOT a solvent based!!!).

The ported TB's improve throttle response, but what you experiencing is common and should be addressed. Installing a Elite E2-X or E2 system after the cleaning will prevent the deposits from returning and then you can do a solvent based cleaning (seafoam/BG/etc.) every 10-15k miles afterwards to keep them clean.

Share pictures of what your valves look like at your mileage for all to see.

Let us know if you need more information as well.

The_Driver · 04-13-2016, 09:24 PM

Check the plastic air intake tube where it attaches to the throttle body. I noticed on mine it was a little loose and the screw clamp was not tightened down properly.

Mike413 · 04-13-2016, 10:32 PM

Quote:

Originally Posted by Elite Engineering

Pull your intake manifold and inspect your intake valves. Your symptoms are common to indicate the level of coking has reached the point of disrupting initial air flow into the cylinders. You have a GDI engine and intake valve coking is a pretty severe issue. You will want to perform a manual intake valve cleaning (NOT a solvent based!!!).

The ported TB's improve throttle response, but what you experiencing is common and should be addressed. Installing a Elite E2-X or E2 system after the cleaning will prevent the deposits from returning and then you can do a solvent based cleaning (seafoam/BG/etc.) every 10-15k miles afterwards to keep them clean.

Share pictures of what your valves look like at your mileage for all to see.

Let us know if you need more information as well.

this is true. sea foamed my car on sunday. then i installed the jacfab ported intake manifold with spacer. when i took the stock intake off i saw the valves were still dirty so i sprayed seafoam on the valves and cleaned them. it helped alot. also i really recommend a catch can. i put on the elite e2 with the clean side separator. i put 200 miles with the catch can and there is already some oil in it.

04-13-2016, 06:52 AM	#1
cohocarl Drives: 2015 1LS Join Date: Jul 2015 Location: Mid-Michigan Posts: 119	LFX off idle stumble/throttle response I couldn't find anything here regarding the off idle throttle response I have on my '15 1LS, and wondering if is the nature of the beast, or just mine.... During normal driving, I have no complaints, although when it is coming off idle, there is a little hesitation. If it had a carb, I'd say it's too lean at idle. It's a bone stock 6-speed with less than 2K miles on it. Just got it back out of hibernation yesterday, but it was like that since new, and does not seem to be the inherent lag of the electronic throttle. Just curious. Thanks, Carl

04-13-2016, 07:01 AM	#2
IneedAZ Drives: 2017 ZL1 A10 & 2021 BMW M340i x Dr Join Date: Mar 2009 Location: Tampa Posts: 5,110 View My Garage	Both Aftermarket throttle bodies and pedal controllers have shown to help this. As far as throttle bodies, there are now 2 options. Ported 72mm size or the new 80mm. There are a few different pedal controllers on the market now. I am using the VTC as it was one of the first to appear for the Camaro on this site. __________________ Sold 2012 2LT RS 12.3@112 old setup Sold 1967 Camaro Pro Street. Ran 10's mild BB on NOS. 2017 HyperBlue ZL1 A10 Born 3/17/17Delivered 4/08/17 2020 Build: Mag2650, BTR Stage2, NW103, BG, 14% lower, 90mm upper, ARH 2" Long system w/no cats, SW Legend mufflers. 807hp/762tq on 93 gas and 848hp/792tq on e47 Sold 2018 (Go Mango) Dodge Charger Daytona 392 Daily Driver Daily Driver 2021 BMW M340i Xdrive

04-13-2016, 08:29 AM	#3
Shawno72 Drives: 2015 Black 2LT RS M6 Join Date: Aug 2015 Location: Cali Posts: 2,033	What he said ^ __________________ Overkill tune/E85/80mm•CAI cold air intake w/my custom maf tube•Apex air scoop•JacFab ported intake/Extendolater•Vitesse•EE EX2 catch can•Innovate wideband•ARH HFC's•NPP exhaust•11386 xpipe•Brembos/cross drilled/slotted rotors•SS M/C•Pfadt 1.25 springs•1LE struts/sways/strut tower brace•BMR diff bush, trail arms/bush, adj toe links•My custom Tunnel brace•Hurst short throw shifter•JDP stage 1 clutch res•1LE steering wheel, shift boot•ZL1 rear diffuser/splash guards•GM splitter•Z/28 grille/flowtie/spoiler/wheels•GM performance pedals•"Chevrolet" door sills•10" Kicker sub•BigWorm overlays

04-13-2016, 02:23 PM	#5
Elite Engineering Drives: 2010 Camaro Join Date: Nov 2009 Location: Denver Posts: 1,381	Pull your intake manifold and inspect your intake valves. Your symptoms are common to indicate the level of coking has reached the point of disrupting initial air flow into the cylinders. You have a GDI engine and intake valve coking is a pretty severe issue. You will want to perform a manual intake valve cleaning (NOT a solvent based!!!). The ported TB's improve throttle response, but what you experiencing is common and should be addressed. Installing a Elite E2-X or E2 system after the cleaning will prevent the deposits from returning and then you can do a solvent based cleaning (seafoam/BG/etc.) every 10-15k miles afterwards to keep them clean. Share pictures of what your valves look like at your mileage for all to see. Let us know if you need more information as well.

04-13-2016, 09:24 PM	#6
The_Driver Banned Drives: 2015 Camaro 1LS M6 Join Date: Jan 2016 Location: U.S. Posts: 272	Check the plastic air intake tube where it attaches to the throttle body. I noticed on mine it was a little loose and the screw clamp was not tightened down properly.