I just got my turbonetics turbo kit installed on my scion tC. It runs pretty smoothly...but I'm knocking at around 2000-2800 RPMs....at 3k and above, it still knocks, but alot less....what could be the problem? The car also has a slightly rough idle....The idle IS NOT bouncy, it just vibrates a little through the firewall...

I'm also throwing these codes...

1. 2195 (o2 sensor stuck lean)
2. 2196 (o2 sensor stuck rich)
3. 0301 (cylinder #1 misfire)

This is all according to my OBDII scan tool...I have never ever seen 2195 in my whole life...as a matter of fact, I never seen a DTC go all the way up to the 2000's, LOL....0301 seems like a good start though. What could be the problem? Also, is cylinder #1 the cylinder all the way on the LEFT or RIGHT? I'm sure its on the left...

Do coilpacks or spark plugs for the 2az-fe go out often? Any help would be appreciated...thanks!

 

I installed my kit about a month ago and will soon write a review of my installation and problems along the way.

Is the vibration just a slight shake? If so, it is normal for larger injectors to roughen the idle a little bit.

Regarding your first two codes I would check the wiring harness of the AFR sensor on your downpipe making certain that it is securely connected. Try unplugging and check it for wear or dirt. It is possible that the sensor was damaged at some point during the installation. They can be fragile suckers.
Where did you install the o2 extension?

For the P0301 code (or for that matter P0300-P0304) I was told by Turbonetics to reset the ecu and see if it helps. It seems as if the random cylinder misfires are just that, random. Sometimes my ecu stores them as pending codes and never trips. I've had this code trip only once over my 800+ miles on the kit.

I'm curious if the misfires are caused by something injector related, not necessarily the plugs or coilpacks. Dezod may be looking into similar matters and maybe they will chime in . I have yet to see any developments on this matter.

 

lol wow, everytime i see a post on a turbo there is always something wrong with them. but i could be wrong because there could be people that do not have problems at all but just dont post. I hope you fix your problems tho!

 

You car is knocking or pinging? That could mean two different things. Have you checked your AFR yet?

 

lol fishing, you here all the bad things because people are trying to fix them, the people who arent having problems are to busy to be on here because they are out running their stuff. It seems people really only post when they have problems. Just like it is with everything espically reviews. You see a lot of bad reviews on products becauase a lot of people dont think to review unless they are having a problem because when they do they want to vent.

 

I've been having a great time with my kit. Very smooth power delivery and it's quiet with stock exhaust. That's why I haven't posted any reviews yet.

 

thats a good question there.

 

Alright, I'm chard1418's friend...I'm basically the one who wrote the thread...

albinoslug - The Vibration is a slight shake, yes...its bareable...as long as the idle isn't bouncy, I'm okay right? I haven't checked where the o2 sensor is exactly...where should it be? Does the downpipe come with a bung for the o2 sensor to be connected too?

I drove the car more, later tonight...and I'm still getting the cylinder #1 misfire...I actually got five codes on my OBDII scan tool...no random misfire this time...only two codes of 0301...and two codes of 2195 and one 2196...I will try out the ecu reset procedure...I'm sorry for the ignornance, but how do I do this? removing the negative would be fine? (sorry I'm not a scion tuner, I'm just helping my friend)....

MIAPLAYA - Well whats the difference between knocking and pinging? All I know is, I'm misfiring like a bi+ch under load...its VERY apparent at 2k-2.5k (literally feels like a hit a brick wall) ....its really annoying and no I have not checked AFR yet...buuut, I do have a wideband on my car...and i remember running lean, like 17.1:1 AFR once, and it feels EXACTLY the same as my friend's scion TC....a big a$$ hesitation.....so I'm sure its running lean as sin, and misfiring...

 

Since I'm throwing a bunch of cylinder #1 misfire codes....should I swap spark plugs and coilpacks with cylinder #2 and see if it changes? It shouldn't take more than 30 minutes to swap and test...but I mean, I'm kind of suprised that coilpacks/sparks would fail this early on a tC? he only has 30k miles

What else do ya'll suggest? I hope its something simple...cuz it REALLY is annoying....and you can definitely feel the knocking at all over the RPM range...its just very apparent in the low RPMs...and alot less in the high RPMs...

Thanks for all the help...I really appreciate it....I never been to this forum and I'm glad its not a bunch of d!cks like some other forums I have seen...

 

make sure all the plugs are gapped the same. You may also want to pull the plugs out and see what color they are this will give you a good indication of what is truly going on. Soinds like the car is running lean when it comes in to boost the car will fall flat on its face. It could be the tune or some other problem. If you give it less throttle will the car accelerate past? If so does it do the same thing at higher rpms as soon as you give it enough throttle to build boost? Do you have a boost gauge?

 

Codes of 2000 or more are not high. There is no high code. Each number in the code means something. If the first number is 0 or 2 then it is a universal code, 1 or 3 and it is a manufactureer defined. The second number represents the system with the issue. The third and fourth number represent the specific problem. As for your issue I am going to say you should definately check all your wiring. Did you install the unichip? You may need to tow the car to a tuning shop and have it tuned. It sounds to me like you have a really bad detonation problem. Anytime you hear a knocking or pinging and the car feels like it is falling on it's face usually it is lean afr's and the car is detonating.

 

dont want to bust anyones ***** here , but you guys need to have a wideband o2 for the very first WOT run on these cars . its like smashing your finger with a hammer . if it hurts the first time dont keep repeating the process . detonation will kill an engine very quickly .

 

ZPI - Haven't checked the plugs...but what should they be gapped at? I'm not familiar with a turbo scion setup...Also, when its time to change them, what brand of plugs and what heat range should he get? Yes the car literally falls flat on its face...it also picks up speed when u let off the throttle...its all throttle dependant really...like lets say I go 40% throttle, at around 2-2.5k, I start to feel it already...then if i keep the same amount of throttle, it will go away around 3k or so and slightly come back throughout the range...if i go above 40% throttle at 2-2.5k, it will fall flat on its face alot harder...if I go less throttle, it will become less apparent...I'm 90% sure its running lean...I had a misfiring problem in my car (nissan altima) and my wideband read lean as heck....like 17-18 AFR (n/a altima that is)...it feels exactly the same on my friend's tC

 

06scionsc- Yeah the unichip is installed....I have no idea what the heck this thing is? I have an apex-i afcII on my car, which allows you to tune on the spot....the guy that installed my friend's turbo said this unichip already comes with preset maps for the scion tC....he just said, "don't mess with it anymore...it runs on a good map already as is"

 

Check the spark plugs. The gap can make a significant difference. Also with these stuck lean and rich codes the o2 sensor might be bad. Does your OBDII scan tool read fuel trims?? With the bigger intake pipe the fuel trim should be some positive % (on my zpi stage 0 it is like 15 or 18% I think??). If the o2 sensor is messed up then it might be possible the ecu is not compensating for a bigger intake pipe and running the car lean overall. Also I think the scion tC may try to use the 2nd o2 sensor for tuning when the 1st one goes out. So if you have some sort of anti-fouler device that moved the 2nd o2 sensor out of the exhaust stream it may be hurting your car right now. Also is there anyway to verify that the unichip was preprogrammed correctly (or even at all)?? Where in so cal are you?? Maybe we could get someone to help or maybe even get turbonetics to help??

 

I would recommend switching to a set of iridium spark plugs try one heat range colder than what come stock. This may help. Make sure that you gap them all very close to one another. When you test drive after that be very careful. If you are detonating who knows when it will do substantial damage. i also agree with the previous statement of checking your o2 sensor. It may be at fault and causing your system to read incorrectly and lean out.

 

06scion could you tell me what kind of iridium spark plugs I should buy?

 

hey thanks for the reply...no my obdii doesn't read fuel trims...its just a regular scan tool that tells you the DTC

My friend is located in west covina...he actually brought his car to mossy performance nissan @ oceanside....they did the install for him...he said they are reputable when it comes to turbonetics installs

I don't even know how the unichip works...is it similiar to turboXS UTEC? if thats the case, I can use my laptop to moniter wtf is going on...

 

can you tell me what gap its suppose to be? i'm sure stock n/a...and turbocharged tC spark plug gaps are different?

 

For iridium plugs I always use NGK's. Kind of a personal preference. Not sure on the part number though. I haven't made the switch to forced induction yet. As for your gap, I would use the lowest stock gap. Whatever the manual or under the hood says use the lowest number. General rule of thumb with forced induction is to use the lowest gap to ensure the best combustion and least misfire issues. I think you have to use special software for your laptop to communicate with the unichip, but i am not totally sure as I have never used it. I know when I had dsmlink you had to use their software for communication and my buddy has an aem system and he has to use their software. For checking your afr's you should get a wideband o2. I personally like the aem as I never had a problem with it in my eclipse.