09-25-2014, 02:02 PM | #1 |
Drives: 2011 Inferno Orange metallic 2SS Join Date: Aug 2013
Location: United States
Posts: 103
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gas smell on startup from engine
Hey all, have. A question for my 2011 full bolt on, and cammed camaro ss.
On start up, lll get a straight gasoline smell coming from the vents it seems every time and I've had my car cammed.for about 4 months now. Has.anyone else come across this issue and is it just common after doing a cam install? Also I was told by my tuner that the "ticking" sound coming from the engine is common with the LS3 motor that after you install a bigger cam, the valves are opening more hence creating the louder "tick" sound the ls3 has stock. Any feedback would be greatly appreciated! |
09-25-2014, 02:08 PM | #2 |
Drives: 73 VETTE ,, 05 2500hd diesel,14 1LE Join Date: Feb 2014
Location: The Left lane PHOENIX AZ
Posts: 2,626
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Bet your running catless. And with a cam and tune and no cats you will get a wiff of gas fumes . Try running the HVAC on recirculate .
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09-25-2014, 02:12 PM | #3 |
Drives: 2011 Inferno Orange metallic 2SS Join Date: Aug 2013
Location: United States
Posts: 103
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I have the hi-Flo cats, but that's it no mufflers. Sorry forgot to mention that.
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09-25-2014, 02:19 PM | #4 |
Drives: Camaro SS/RS inferno red interior Join Date: Mar 2012
Location: Pompano Beach FL
Posts: 817
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High flow cats will still do this (it helps a little with the smell compared to no cats) and i really don't think if you have mufflers or don have them you should still smell gas.
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09-25-2014, 06:31 PM | #5 |
Drives: 2012 2SSRS Vert, Black w/M6 Join Date: Jan 2013
Location: Montgomery, AL
Posts: 1,265
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Stock injectors? The first 4 seconds of startup are tuned separately from the MAF and VE tables, that could be set too rich. I've seen a bunch of tunes where startup airflow wasn't tuned.
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09-25-2014, 06:36 PM | #6 |
Drives: 73 VETTE ,, 05 2500hd diesel,14 1LE Join Date: Feb 2014
Location: The Left lane PHOENIX AZ
Posts: 2,626
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I do not smell any gas on mine when I start it up in the morning in my garage with the garage door open ,and my car doors and windows closed . SP 1 7/8 Long tubes and what is jokeingly called HF cats ,with a Nick-D tune. .
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09-25-2014, 08:53 PM | #7 |
old school chevy rodder
Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012
Location: Oregon
Posts: 5,588
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I have about the biggest cam out there I imagine .639/.623 and no gas smell though I have high flow cats, also I have no ticking at all and used 7.375 pushrods as per my gm gurus advice.....never had ticking and still do not... the only gas I can smell is by the exhaust from running a little rich as per needed by a rad cam on start up, and to avoid ever going lean. many do not know to use the length of pushrod I used as many places just sell the 7.40 and its not a common thing to find out anywhere most notable by searching here or there. Then of course I also run driven racing oil......I had a h.p. tune on a mustang dyno by a electrical engineer who does just g.m. products..... wongs performance engineering.
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09-25-2014, 09:40 PM | #8 |
Drives: 2011 Inferno Orange metallic 2SS Join Date: Aug 2013
Location: United States
Posts: 103
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Shit, I guess back to my tuner he said it was normal and it's a GM shop, corvettes and camaros.. I just can't win
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09-28-2014, 05:07 PM | #9 |
Drives: Black L99 2SS/RS Join Date: Mar 2014
Location: San Antonio, TX
Posts: 1,868
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Same here I had recently had LT headers and high flow cats installed with a tune, I also run muffler delete and there's a slight smell of gas too.
Is this something to be concerned with and head back to the tuner or should I ignore it? |
09-28-2014, 05:10 PM | #10 |
Drives: 2012 2SSRS Vert, Black w/M6 Join Date: Jan 2013
Location: Montgomery, AL
Posts: 1,265
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Shouldn't be a major concern. It could probably be tuned out, but isn't a big deal. Those HFCs just aren't as efficient when cold during startup.
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09-28-2014, 05:20 PM | #11 |
Drives: 2012 2SS 45TH Anniversary Join Date: Mar 2012
Location: Kentucky
Posts: 720
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I had a mild fuel odor when I first have my tune and catless LTH and ZL1 retro exhaust put in. It went away after a few weeks..
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10-04-2014, 11:50 PM | #12 | |
Drives: 2018 Camaro 2SS M6 Join Date: Mar 2013
Location: Tx
Posts: 30
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Quote:
As I understand it if the car has the o2s in tack still it will not be rich at idle since the o2s are pulling and adding fuel to get the commanded 14.7 AFR. The fuel smell is from the overlap of a larger cam. When both Intake and Exhaust valves are open at the same time the fuel coming into the cylinder will make its way straight into the exhaust and never get burnt in the cylinder thats what gives off the fuel smell. Even larger cams will stink really bad at idle even if the tune commands it to be really lean. Hopefully that makes sense.
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2018 Camaro 2SS LT1 M6 / Borla Atak Axle Back / Elite Engineering Ex2 Catch Can /Michelin PS4s 245/275 Stock Sizes
2010 Camaro 2SS LS3 M6 Cam & Full Bolt ons - Sold |
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10-05-2014, 05:34 AM | #13 | |
Drives: 2011 Inferno Orange metallic 2SS Join Date: Aug 2013
Location: United States
Posts: 103
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Quote:
Grind is 281 LRR HR13
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aFe CAI / SLP 1 7/8" headers, SLP 2.5" full exhaust 4" quad tips / COMP cams "mild" cam/ 160* t-stat/ dyno tune (442rwhp/418tq)
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10-05-2014, 11:35 AM | #14 | |
Drives: 2018 Camaro 2SS M6 Join Date: Mar 2013
Location: Tx
Posts: 30
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Quote:
(Intake Duration+Exhaust Duration)/2 - (LSA * 2)= Valve Overlap As far as the ticking sound, what pushrod length did you go with on your cam swap? The aftermaret cams typically have a smaller core size then the factory cam so if you don't have the proper preload on the rocker arm/valve spring that can increase valve train noise. I'm running 1.425 BTR chromoly hardened pushrods, BTR .660 polished dual valve springs and a Cam motion cam with no ticking sound. Actually my valve train is only slightly louder than stock. Also are you running an oil high in ZDDP like Amsoil Z-Rod, Joe Gibbs LS30 Or Valveoline VR-1?
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2018 Camaro 2SS LT1 M6 / Borla Atak Axle Back / Elite Engineering Ex2 Catch Can /Michelin PS4s 245/275 Stock Sizes
2010 Camaro 2SS LS3 M6 Cam & Full Bolt ons - Sold |
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