Capito2007

heres the scope:

i have a 2006 chevy cobalt ss/sc bout 70,000miles on it. about a year ago, i added an injen cold air intake. 3 months after adding the intake i hit a huge puddle of water. i did all proper steps i installed a new filter, this time with a hydro shield cover. i have used SEAFoam to rid any water (if any) that may have been in engine. i had a code for my MAF so i cleaned i installed a new one. still have this problem: ONLY, when it rains/snows or the roads are wet does it occur. after driving on wet roads and allowing my car to sit for excess hours/over night. i start my car and it idle hunts. i sit there while it does this over and over, finally i begin to drive as i drive the engine cuts in and out and the entire car studders and refuses to go anywhere, not until the car has hit 140degress will the engine light kick on and the problem goes away. again i stress it only happens when there is water on the roads. i've changed the MAF SENSOR, bought a new filter with a hydro cover. neither i or my mechanic can figure out what the problem is. SOMEONE PLEASE HELP!!!

chris88z24

Put the stock intake back on? That hydro cover SUCKS and doesn't do anything during big rainstorms.

DiabeticKripple

iTrader: (2)

tune for the intake?

alleycat58

^^^Do this. If the problem still exists, then there's something screwed up mechanically. If the problem goes away, you're still getting water in there.

Hydroshields aren't God mod. If it's ONLY doing it when there's moisture on the roads, then I'm guessing there's still moisture getting into the intake.

murphy0789

iTrader: (1)

Build a sheild out of plastic to stop the flow of water into intake had to remove my cold air intake for a brief little bit because of this issue built a shield to keep water from hitting it and problem solved. You are getting water in intake hydro shield is basicly useless my hydro shield didn't do anything still had an issue. I couldn't even go through a car wash.

alleycat58

You don't *have* to tune for an intake. I had a 3" intake on my stock tune for 4 years and never once did I have it idle hunt.

murphy0789

iTrader: (1)

This ^ same here. But to get the full advantage get a tune!

DiabeticKripple

iTrader: (2)

never said you had to, just a suggestion to maybe fix it

alleycat58

Shouldn't be bouncing at idle from an intake period. There's another physical problem somewhere in the system that's causing it. A tune won't fix that.

Capito2007

not sure what a tune up could do, ive had multiple since installing my intake. its defiantly a mechanical issue. i just dont know what. i cant seem to figure out why water keeps getting in. it basically is within a plastic shield, its encased behind the tire. should i have gotten a short ram instead? i cant figure out why mine is the only one having this issue. no-one else i know has had a problem with their intake like i do mine. there is a mechnical fault and i dont have a clue what it is

alleycat58

Not a tune up, a tune. PCM flash. The hydroshield doesn't do much to keep water out, IMO. I had to block off a part of the fog light hole because I kept getting water in mine too. After I did that, no more problems with water. They don't make a short ram for the SC'd Cobalts.

You said you checked/replaced the MAF and filter, just for ***** and giggles have to inspected the throttle body to see if you're getting water and presumably dirt in there?

ecot3c inside

iTrader: (11)

is it gm's fault?

Chevycobaltss3

iTrader: (2)

OK now since alley you said you dont have to tune for the intake ( you are corect) But i promise you he would be alot smarteer if he did..... WHY? Because his fuel trims will be out a possible -20/+20 ive seen it nd i was like really holy ****. And if fuel trims are out this much it can cause detonation which can cause a blown engine. Would most think that it can happen no, in reality its a possibility of like 10% but it can happen. Also with a tune he can get the great feel of being tuned for it, but also having the perspective of seeing a stock car with intake vs the intake with tune. SO IF I WERE OP ID GET THE TUNE. OR PUT THE STOCKER BACK ON.

alleycat58

I didn't exactly say NOT to get the tune either, just that it wasn't required. If it were me, I'd get the mechanical problem fixed first and then get tuned.

Capito2007

think im just going to scrap the POS

Chevycobaltss3

iTrader: (2)

Well ive seen a intake cause a idlehunt and so has the throttle body, a vacuume leak will as well. verify the maf is secure, and that you have no vacuum leak,and your throttle body is clean.....

kxrida2000

iTrader: (12)

BINGO...id change the tb after u check other small things first and it doesnt fix it. I had a brand new tb from gm crap out on me and caused the same issue and i had no idea wat the problem was and took me 2 weeks to figure out cause it was brand new.

Hammbones

iTrader: (1)

Same thing started happening to me recently, I checked my Vacuum line from the Intake and it was nearly completely off the stud off the valve cover..

cobaltss#01

iTrader: (4)

I know that I've got water in my alternator from hitting alot of water that was going across the road from a creek flooding and had a similar problem.BUT after it dried out it was fine.Not that this is the problem.I do have the Injen intake with a hydro shield also.

Capito2007

so wait would a vaccum problem, or throttle bottle issue only occur when there is water on the road? thats the only time i ever have this problem. its weird. like this morning driving in after a rain storm last night it was happening. and i noticed that onces the coolant temp hits 140 everything goes to normal but my check engine light kicks on. i check the code and it comes up (MAF or VA) i cant remember the code its like PA101 or something

Capito2007

also, could the vaccum explain why my boost gauge is reading an increment of 10 higher during idol?

Chevycobaltss3

iTrader: (2)

Dude if u r throwing a maf code fix ure maf. Ure still sucking water up into the maf even with the.cover on the air filter.......... Fix it

Capito2007

dude i have, ive cleaned it once and changed it once. neither fixed the problem. it has to be somethign else. idfk

umrdyldo

iTrader: (1)

If your boost gauge isn't reading 20 HG at idle then you might have a leak. Try checking all of the connections from the intake all the way to the throttle body and even the throttle body gasket as well.

Then I would also clean the throttle body and put the stock intake back on.

EDIT: by connections I am not talking electrical connections. I'm talking about fittings and clamps.

cmatthewb101

iTrader: (4)

I'm having this same issue. Only when it rains, I have to let the car warm up. After that, it's fine.