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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 01-11-2012, 07:30 PM   #1
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rough idle after intake install

can somebody please delete this thread!

Last edited by harrington81; 02-13-2012 at 09:30 PM.
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Old 01-11-2012, 07:39 PM   #2
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How much better when warm? I'd check the hose clamps, maybe they loosened up in the cold weather.
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Old 01-11-2012, 07:52 PM   #3
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Have you run a full tank of gas through since it started running rough? Is the check engine light on?
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Old 01-11-2012, 07:53 PM   #4
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I would check all the hose connections again. Also check the orientation of the MAF.
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Old 01-11-2012, 07:57 PM   #5
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I will check the hoses and clamps. What's the orientation of the MAF? And yes i've ran several full tanks through. No check engine light. If it had one i would've scanned it a long time ago.
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Old 01-11-2012, 08:02 PM   #6
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I seem to remember that the MAF could be installed backwards. The locking tab should be up.

I also added silicon gasket maker around the MAF for better sealing.
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Old 01-11-2012, 08:05 PM   #7
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The arrow points to towards the throttle body. That's the way i did it.

I do remember sometimes when the car was cold I would let out the clutch and it would sputter and shake like crazy. Only sometimes and not for very long.
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Old 01-11-2012, 08:14 PM   #8
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Sounds like an air leak to me.
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Old 01-11-2012, 08:16 PM   #9
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Any trouble codes? If it hasn't been tuned after the CAI install, that could be the problem, but you need to verify it with a scan tool.
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Old 01-11-2012, 08:22 PM   #10
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Quote:
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Sounds like an air leak to me.
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Old 01-11-2012, 08:22 PM   #11
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Excactly. I would never do this mod again without it being tuned. But voiding the warranty ain't gonna happen.
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Old 01-11-2012, 08:31 PM   #12
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Leak

Vacume leak !
Don't need a tune.Had mine on since 2010 .No problems.Ever.
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Old 01-11-2012, 08:37 PM   #13
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I just had the same exact problem... When it started getting down around 20-30 degrees F.
I found two things...one the small vacuum hose running from the intake to the engine had a small crack in it. ( however I don't believe this was the issue at all) second was all the hose clamps were loose especially around the throttle body and the filter was barely on. I tightened all of them and it runs great. Mine eventually threw a codes p0174 and p0171. After tightening clamps I the codes and they haven't come back. The LS3 sucks a ton of air and from what I've read too... much an the computer can't compute the air fuel curve.
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Old 01-11-2012, 08:38 PM   #14
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*reset the codes* sorry for the typos.... Sending from phone
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Old 01-11-2012, 08:53 PM   #15
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Ah okay. I will check all of them and see if everything is tight. Mabye that's the problem.
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Old 01-11-2012, 09:28 PM   #16
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Quote:
Originally Posted by jcollins91106 View Post
I just had the same exact problem... When it started getting down around 20-30 degrees F.
I found two things...one the small vacuum hose running from the intake to the engine had a small crack in it. ( however I don't believe this was the issue at all) second was all the hose clamps were loose especially around the throttle body and the filter was barely on. I tightened all of them and it runs great. Mine eventually threw a codes p0174 and p0171. After tightening clamps I the codes and they haven't come back. The LS3 sucks a ton of air and from what I've read too... much an the computer can't compute the air fuel curve.
No crap they pull a ton of air. I (after at least one too many beers) washed my engine area. I'm a real clever guy so I put a wal-mart bag over the intake so it wouldn't get wet. In all of my cleverness I forgot to take it off when I started it to back the car in the garage. It didn't take me long (maybe 0.5 seconds) to realize what I had done. Want to see the suction power of a 6.2L V8?

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Old 01-11-2012, 10:54 PM   #17
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Holy crap that's crazy.
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Old 01-12-2012, 02:32 AM   #18
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vaccummmm

leakkkkk
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Old 01-12-2012, 09:09 AM   #19
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A few things here:

1. I am not a mechanic, but it sounds like something is not installed correctly or worked its way loose, or like some others are pointing to it could be a vacume leak.

2. Our CAI does NOT require a tune, will not throw a CEL, and will not affect the vehicle in the way you are describing other than if something was not installed correctly or loose.

3. The cold weather and the CAI would not cause an issue. All our CAI does is keep the air that you are pulling in from outside as cool and unaffected by the engine bay heat as possible. So if its 20 degrees outside our CAI will help keep the IAT slightly above 20 degrees. Whether you have our CAI or the stock system you are still sucking in 20 degree air.

Basically other than the possibility of a loose connection or improper install on the CAI it sounds like there is a different issue with the vehicle. I have experienced the same EXACT problem with a vehicle (Sierra 2500 6.0L) and those symptoms could point to a multitude of issues including anything from a plug or wire problem, cap & rotor or coil packs, multiple cylinder misfire, vacume leak, clogged or bad injectors, bad TPS sensor, bad IAC sensor, bad or dirty MAF, and the list goes on. Usually its a vacume leak, especially if it happened in cold weather a hose may have become brittle and cracked.

I wish for your sake it was as simple as saying switch out your cai but it does not sound like thats the case. Considering that we have sold thousands of these all over the world and in extreme climates and never had a problem, nor would there be any logical reason for it to cause that type of problem (barring a incorrect install or loose connection) I would say you have a different issue. Good luck with the diagnosing! I hope you get it back to running smooth again soon!
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Old 01-12-2012, 09:58 AM   #20
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OP, you may have a "weak" MAF sensor and installing a larger diameter intake tube that changes the flow characteristics will exacerbate it. Pull the MAF sensor and check it to verify it has a designation on it that contains a letter and TWO numbers. For example mine is K19, this is a strong sensor. A weak one would be K8 or similar.... This is a documented issue and many have resolved various issues by replacing theirs with a known strong sensor. Even when completely stock and no CAI has been added.... let us know what you find....

This thread has a photo of a strong unit (it just happens to have the same designation as my stock sensor):

http://www.camaro5.com/forums/showth...ght=strong+maf
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Old 01-12-2012, 06:34 PM   #21
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It runs perfect now. It was a air leak for sure. I went around and tightened all the clamps and now it works great. Thanks for the help guy's. It was my fault. it's a great product and i'm really glad i bought it. Top notch unit.

Last edited by harrington81; 01-12-2012 at 09:22 PM.
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Old 01-12-2012, 06:45 PM   #22
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glad you found it.

Glad you found the leak. Hint once a month or so I check the tightness of the clamps.Just to be on the safe side.Easy thing to do when cleaning and wiping down the engine compartment.
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Old 01-20-2012, 07:31 AM   #23
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OP, you may have a "weak" MAF sensor and installing a larger diameter intake tube that changes the flow characteristics will exacerbate it. Pull the MAF sensor and check it to verify it has a designation on it that contains a letter and TWO numbers. For example mine is K19, this is a strong sensor. A weak one would be K8 or similar.... This is a documented issue and many have resolved various issues by replacing theirs with a known strong sensor. Even when completely stock and no CAI has been added.... let us know what you find....

This thread has a photo of a strong unit (it just happens to have the same designation as my stock sensor):

http://www.camaro5.com/forums/showth...ght=strong+maf
K8 would also be a "strong" sensor. Letter+number is "strong." Letter by itself is "weak." For example, mine is an S which is a "weak" sensor.
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Old 01-20-2012, 02:55 PM   #24
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No crap they pull a ton of air. I (after at least one too many beers) washed my engine area. I'm a real clever guy so I put a wal-mart bag over the intake so it wouldn't get wet. In all of my cleverness I forgot to take it off when I started it to back the car in the garage. It didn't take me long (maybe 0.5 seconds) to realize what I had done. Want to see the suction power of a 6.2L V8?

I did the exact same thing on my '55 chevy truck a few months ago, it is the ring type air filter in a nice edelbrock crome tray, after i started it i realized immediatly what happened, looked under the hood and that airfilter was now about 1/2" tall, lol, good thing is was an old cheapo
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Old 01-21-2012, 03:33 PM   #25
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I did the exact same thing on my '55 chevy truck a few months ago, it is the ring type air filter in a nice edelbrock crome tray, after i started it i realized immediatly what happened, looked under the hood and that airfilter was now about 1/2" tall, lol, good thing is was an old cheapo
Yeah, cost me more than $50 to replace it (new one should be in on Monday). Guess who won't make that mistake again.

What makes it even worse is that I did it right before I went to a buddy's to install the long tubes. I had to tell him and another friend what had happened. They're still giving me crap about it. Oh well, nobody bats 1.000.
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