Hey guys woke up this morning to go to work and i got a check engine light. After work i took i t to auto zone and they said i was running to lean. I have had an Injen CAI intake for a few months never had a problem so i dont think it that. Does anyone know why i might be running lean? Any help would be great thanks.

 

what code do you have? If you have not one anything else to the car, it might just be the intake. Most of us with and aftermarket CAI get the code P0171 I believe it is, and is perfectly normal. You'll get the CEL once in a while (especially when temp is cold), then it will go away.

 

or it cold be a vacuum leak

 

he didnt give me a code just told me i was running lean, so im cleaning my MAF sensor right now and if its still there ill go back and get the code. What ever it is its killing my gas millage.

 

my injen intake gets a leak cuz of where the maf screws in, the screws come loose and cause unmetered air enters the intake mani.....or u have a vaccum leak. if its po171 dont ignore it like everyone says to do check the maf or smoke the vaccum to see if ur leaking or nottttt...also how cold is it where u live???? and do u mat it at low rpms in a higher gear??

 

its about 15 degrees out here right now, im going to check the intake but one ******* screw is being a bitch to take off the black wheel well cover right in front of the tire. i can't reach it because i don t have the right size open end wrench. I hope its something simple because im getting like 15-18 mpg

well i fixed it, was driving to auto zone to get it scanned again when some guy in a blue cobalt non-s/c pulls up and tries to race me LMAO. i shift into 2nd doing idk 30 and take off.. When i finally slow down next thing you know the light does out. Crazy ass car...

 

That doesn't mean it is necesarily fixed bro. About a month ago, I was having a lean and misfire problem and it would randomly go off and come back on the next day or so.

 

Yea i figured it was to good to be true so im going to test for a vacuum leak tomorrow hopefully i dont have one. Im thinking it may have just been the cold weather.

 

Ya that would be best case scenario. Do you remember when it came on? Idle? WOT?

 

i think i was cursing along on the highway then i looked down and i was like o **** what is this ****.

 

yeah i just got a cai and i have the same problem..

whenever i shift into 2nd, it bogs then hops into a **** load of power... the check engine light has been on for 2 days now

 

very common. but it's not killing your mileage. there's something else that is doing that. either a heavy foot, winter gas, or all of the above. how often do you reset your dic to check for gas mileage, and do you manually calculate it? if you're getting 15-18 mpg there's something very wrong, but it's not because of the p0171 code.

are you spinning at the top of first, or are you shifting before redline? reason I ask is if the tires are spinning, you're going slower than the speed says, so you're hitting 2nd too early. that would cause it to bog, and then kick in when it gets more in the powerband. or is this just in normal everyday driving.

 

wtf i just got the same thing on my ss/sc i put my intake on and a few days later it came on it also killed my gas mileage went through a full tank in 3 in a half days! HELP GUYS!!!

 

do a search for p0171 and it will tell you all you need to know. I knew this was going to start happening again with the tc, it's all back to "what intake shoudl i get" and "help, i have a cel"

just put that code in the search bar and you'll find out everything.

 

Check all your vacuum hoses. mine all have been cracking causing vacuu, leaks. which will sit a code. Bank 1 system to lean and the computer will dump more fuel trying to compensate for it. Also fuel this days has a higher ethenol contain which will also sit that could but it shouldnt stay on for more than a couple days. if you have no vacuum leaks, buy some fuel conditioner and start filling your tank somewhere else. Becarefull cleaning your MAF sensor some are very sensitive and some cleaner may ruin it. i know that for sure on fords but dont know about newer chevys.

bank 1 system too lean is a O2 sensor code. doesnt mean the sensor is bad its just doing its job. A CAI intake will not cause that code because the MAF sensor but i think it is really a MASS sensor(ill have to check) it reads the pressure and temp(depending if its a mass or maf) of the air coming in which tells the computer how to adjust for the air/fuel mixture. If more air gets in you get a DTC if it is bad enough. which i noticed mine to be very sensitive to leaks. Higher ethanol means there is less fuel to be burned there for the O2 reads too lean.

When you put the CAI make sure you disconnect your battery for awhile. Your computers settings need to be reset and relearned.

 

its normal everyday driving. i only go WOT when a stupid rice burner honda is around

 

so what do you mean it bogs? are you giving it gas? maybe you're shifting too early? what rpms do you shift at. or maybe the rpms are dropping too low between shifts.

 

i check my gas millage every time i fill up, this last time with the check engine light was real shitty. But thank god its off because its all back to normal now. Good luck to you all with those CEL's

 

i shift at 3k rpm.. i know its not my shifting at all.

and i mean it bogs like as soon as i shift and put some more gas on, it loses power then out of nowhere it feels like im flooring it, but im not..

i guess you could compare the jolt to a person who has no idea how to drive a stick (ive been driving stick for more then 2 years though so im fine shifting)

 

if you're shifting into 2nd at 3k rpms from first, you're putting the car way too low out of it's powerband, and if you are not shifting fast enough it's probably almost stalling. that's why the car bogs. my guess is when it bogs, you give more gas, rpms rise and it takes off. sound right?

 

wait... so your sayin i need to shift at like 5k rpm in normal everyday driving?? sheesh ive had the car for 2 years and its drove fine til i got the cai

 

from 1st to 2nd gear shift a little higher. first gear is so short that the rpms fall like crazy. any other shift you can go at 3k or lower. but if you're shifting from 1st at like 3k, the rpms are dropping crazy low. if you shift, and let off the gas, the car will probably start bucking like crazy because it wants to stall. most people shift WAY too slowly, not realizing that you have to shift much faster at lower rpms because the rpms are dropping less. so shifting low, plus a possible slow shift and your rpms are simply too low. that would explain why the car bogs, and as the rpms raise it gets more in the powerband and takes off. that just makes more sense than an intake causing it. try shifting from 1st at 4k. all other shifts you can still do lower.

 

hmm ill try thanks for the tip

 

no prob.

 

my engine lights on but runs fine not sure its when i got stage 2 installed but it goes out some days and comes back its about - 25 celcus here tho