hok, first to let ppl who read this, my car's a 99 Z24 2.4L Cavvy Auto. Now earlier today i installed a CAI. shortly after test driving around i noticed theETS light came on followed by the Check Engine Light. The reason why is followed by hard shifts from gear to gear (especially noticeable when upshifting), like it wants to bolt for a quick bit. I can see why the ETS or Check Engine light would go off because of the IAT, but i dont understand the rough shifts. is my tranny in danger of dying? BTW i just bought it and still have warranty coverage on it, but if its a simple fix(God i hope so) then i'd or my friends could do it. much appreciated and thanks in advance!

hey i have a 99 z24 auto also and right after i installed my cai i also had the same problems the engine light and ets is caused by vacum leaks i had to change out the line front the oil seperator to the cai and the hose from the oil seperator to the outlet located by the fuel rail.i still havent figured out the hard shifting yet mine is more noticable when shifting from 2nd to 3rd and then just going in second it tries to take off on me, i hope this little helps

is yours an auto too nick99z24?

check your IAT sensor , 99/100 times it is related to the IAT

yes it is a auto

[quote=97cavie24ls(JDM cav sedan™)]check your IAT sensor , 99/100 times it is related to the IAT


so true....

iat screws up, it kinda messes with a few other sensors including the tps...which since you have a electronic shifting transmission, it affects it.

any future wear/tear on the auto tranny if i dont get the IAT checked? how would i check it? reset the battery and the ecu fuse? that was from where i heard it, but again goin back im a newb, if that's true, how and where do i start? thanks in advance everyone ^^

i forgot to mention that if the IAT is plugged in , and you are getting the code , you will need to replace the connector end , the wires as they go into the connector break , the connector end is about 15-25 dollars from the dealer


and its easy to replace

icic, thx for the notice, until i get it, and i would have to ;put up with the hard shifts, any damage done or will be done to the tranny 97cavie24ls(JDM cav sedan™)?

transmissions auto should shift pretty smoothly...

if it doesnt, worn bands and clutches CAN occur... not always, but it has happened. your shifts should be firm, not hard.

wil it would appear the hard shifting is possibly due to the IAT sensor is off and that, from what others on this forum told me, the car went into a 'limp loop' or 'safety mode' where it reverted to the hard shiftings. until i either get a new IAT sensor or even a flash ecu, the problem will continue. im just worried that my tranny, but tomorrow im planning on goin to autozone to get a free diagnostic reading and possibly a flash ecu if its not expensive. let me know what you guys think, especially Dam-it Muffins (Event) , i heard u're 'god' when it comes to j-bodies. thanks in advance

just get it checked, make sure the iat sensor is plugged in. if it is and your still getting a code, have advance reset the code if they can, and see if it comes back on within a day or two. if it does, replace the connector end as somebody already mentioned. then have them reset the code again and see if it comes back on. hope that helps



2000 Camaro V6.
| SLP Loudmouth | CAI Intake | HID's |

fst100 _ wrote:wil it would appear the hard shifting is possibly due to the IAT sensor is off and that, from what others on this forum told me, the car went into a 'limp loop' or 'safety mode' where it reverted to the hard shiftings. until i either get a new IAT sensor or even a flash ecu, the problem will continue. im just worried that my tranny, but tomorrow im planning on goin to autozone to get a free diagnostic reading and possibly a flash ecu if its not expensive. let me know what you guys think, especially Dam-it Muffins (Event) , i heard u're 'god' when it comes to j-bodies. thanks in advance

i am definately not "god"

more or less i am a commoner that when i started i did alot of really stupid things, and from trial and error i gained knowledge



but i dont think autozone can reflash an ecu... thats more a dealer or performance shop deal, and usually mid to high 300$ range.

iat sensors on the other hand are around 11-15$ and a way easier choice.

im gonna go to autozone and get a free diagnostic check, and im hoping its just an IAT sensor replacement. how difficult is it to install an IAT sensor? any tips or instructions? thanks in advance.

dude....

if you can plug and unplug a wall outlet socket, you can do an iat....

unclip sensor, pull out old sensor, put in new one, clip on harness. done. and more than likely the IAT you have seen it many times before and never knew what it was.

if you did your intake , then you did the iat already

why is it so hard for you to go out and check to make sure you plugged it back in ??


you ask for help and we give you enough info to check the problem , but you still say nothing about going and looking to see what the problem is ????


7 outa 10 times its unpluged , the 3 outta 10 times the wire broke just as it goes into the harness


and not that i want to be a ass , but either figure it out or take the intake off and keep the car stock

first off, i do apologize for being such a dumb-ass, i just want to make sure everything is fine with the car. my last car was a 98 malibu and it had problems in the start/ignition module-if anybody even knows about it, and i already had the starter and ignition replaced but the car still stalls out because of the anti-theft-therrent, O2 sensor was miessed up and the check engine light never goes away, even after flashing and the ecu. keeping it short, i just want everything to go right with this car and not stress a whole lot over something stupid. that and getting a double-check and reassurance thats all. i do appreciate you guys helping out on this thread, alot of friends told me to go here and i'd learn alot of stuff about this car. i like the site, and i intend to stay and check back here for info.

did you look over the iat ???

give us some feed back on you checking it , its hard to help you if you can give us the help we need also

making sure the iat is plugged in is the easiest thing to , if its plugged in the next easiest thing to do is lightly pull on each of the 2 wires going into the plug , and 1 will pull out out pretty easy meaning you need to replace the connector end , if you need that connector end say so and ill get the part # outta my tool box and post it for you


right now the computer sees the iat reading -40 degrees outside , so its up shifting hard and fast to help the motor heat up , and prevent wear to some parts , its normal , but not recomended for long term

so the longer we do not get the info from you the greater the possibility of something might happen

ok i went to autozone, got an OBD2 checked and it was the IAT sensor, bought the IAT sensor and plugged it between the end plug of the IAT and the intake pipe. the ETS Off light disappeared in like 5 minutes after driving normally and shifting's back to the norm, but the check engine is still on. im guessing because of the new IAT it reads it as a foreign object. possibly i could unplug the neg off the battery for about an hour and see if it resets the reading. let me know if that's and ok. thanks in advance.

do it, but you only need to disconnect it for 20-30 min, then start and run the car a few times, what your doing it reteaching the computer to adapt to the new intake.

ok thanks for the help everyone....im gonna do it right now