Sean Cummings

Well i was getting both the 171 code and the misfire on cylinder 1 before I got my hot engine issue fixed. Well I have my temps back to norm and now I am getting the 171 code again with no misfire code. My question is I only get this when it is i am criising and not all the time. The light didnt come on when I drove it yesterday at all and all the way to work. On the way home it came on cruising home, i hooked up the scanner and 02 looked good except on decel they go to .0000 untill I hit the gas. Car runs fine with no other codes, i check for vac leaks but didnt find any that are obvious. Saw some where that the purge solenoid can cause this. I am going to check that in am. What else should I look for that could be causeing this? I just got this code after the stage 3 kit.

jcobaltss

What tune do you have?

Staged07SS

iTrader: (25)

It went to zero on decel due to fuel cut. Totally normal.

Sean Cummings

I have zzp's can tune. I replaced the 0's when I got the car with Denso's the both seem to be working right. I was just hoping some had this issue after install. Car runs great no issues. I guess I will check the normal things. If anyone has any idea's that I may have looked over

Staged07SS

iTrader: (25)

Are u running the stock intake or aftermarket?

CobaltSS 16

iTrader: (3)

unfortunately its most likely in the tune itself. The code itself isn't anything major to worry about (unless your fuel trims are way outta wack, probably not the case with the zzp canned tune)... Its a system to lean code.

Check your long range fuel trims... i believe the CEL sets off if its something like +/- 10-15% (I'm not exactly sure honestly.)

I popped this code and was like that for a couple months because my LTFTs were a bit high during idle. My tuner tweaked a few things and I was good to go.

Staged07SS

iTrader: (25)

Yup, I believe its +15 / -15% for x amount of seconds it will throw either system too rich or system too lean.

Sean Cummings

I am running the injen cold air intake, it came with car. Drove it to work 35 min no light, but bet on way home when air is cooler it will come on again. Beat my first Rustang on way to work also... Lol

Staged07SS

iTrader: (25)

Do yourself a favor.... Pick up a stock intake & airbox.

I tested an injen intake a few years ago. It actually flows less than stock, but the issue is the MAF sensor placement. When you change that, you can end up throwing codes.

Sean Cummings

The thing that is my question why would this have a code now when I didnt prior to tune and install? You are basically saying this air intake is worse then the factory?

ECaulk

iTrader: (6)

That is exactly what he's saying.

And the difference pre/post tune has everything to do with it, did you tell zzp you were running the injen?

Sean Cummings

Yes I did tell them what intake was on car. That is why I am confused why the light would come on after tune when it was put on order form. I dont have the factory air box.

Staged07SS

iTrader: (25)

Pick one up when you can get a chance. I run the factory intake on my car, and it supports 300+ hp.

Log your fuel trims for me and let me know what they read.

ECaulk

iTrader: (6)

Did you make sure a connection hasn't come loose on the intake?

Sean Cummings

I dont have anyway to log, but the light came back on this morning, stayed off yesterday. I did look at the LT and it would go -3.8 then back to 3.8 and of course it changed every few mins. I will see if my buddy that has HP tuners can log it for me. Does anyone know if it costs to do a log with HP tuners. He said he would buy the license but it cost two credits and he is just starting to play with his tune for his Camaro so not real comfy with paying for it when we bot have no clue. So you are thinking since it is a randome code that it is from the air intake

Staged07SS

iTrader: (25)

Hard to say... if you just installed the intake and it caused the code, then I would say yes, its the intake, but since it is a canned tune from ZZP it could be within the tune parameters they set.

ECaulk

iTrader: (6)

To log it, you won't have to pay. You'll just have to setup the config file for the LSJ.

Sean Cummings

Tonight i had my scanner hooked up waiting for the light to come on and was looking at my o2's and map sensor and tps and all was looking for out of the norm things. Well my fuel system would go from closed to open on decel, i thought that was kinda strange. What should my map and mass be reading at cruise? I plan on getting a data log of it this weekend is there anyone that can look at it for me to see if the tune looks right. Timing seems to be @ 30 at cruise and 25ish on acceleration. Just a few things I was noticing on my drive home.

ECaulk

iTrader: (6)

What you need to look at is LTFT, STFT, MAF freq, MAF lb/mins, and VE lb/min at least if you're wanting to figure out why you pop that code. Granted you'll really want to log a wideband if you can to compare how far off the tables are for WOT or anytime throttle command puts you in the PE (power enrich) table.

Staged07SS

iTrader: (25)

25 degrees timing advance at WOT is high for a 93 tune. Was that 25 degrees up top?

Your o2 going from closed to open is fine. On decel our cars cut the fuel.

Def get a wideband & some data logging software.... Either and interceptor gauge or HPT.

CobaltSS 16

iTrader: (3)

that scanner is definitely off. no way he is hitting that amount of timing with pump gas on a canned tune. that e85 custom tune territory

Sean Cummings

It was 30 at cruise. I plan on getting a data log this weekend, can anyone look at it and my tune. My buddy messes with Camaro's and has no clue on the lsj's 26 degrees at beginning full throttle didnt go ***** out. I dont have the extra cash for the wide band or Hp tuners. Getting ready to go to FL on vacation in a week or so. I wasn't expecting these issues

Sean Cummings

I was looking at my LTF and short term and my long term sits @ 16-18% when the light came in. Short term was @ -3.8 to -6.8 didn't notice mass or map. This will come on after about 30 min of driving. I have looked for vacuum leaks and can't find any. Do you think it maybe the tune? I have no there driving issues at all. Runs well no knocking or detention that I can hear. Has new o2's and cat. 02's are reading 760's constant when at cruise. And timing is @ 16 at full throttle and 30-35 @ cruise. I am thinking it is the tune.

CobaltSS 16

iTrader: (3)

that makes more sense. Honestly the code isn't a huge deal, but its on because of the LTFTs. Get a custom tune if you want it off. you can try the factory intake, but no promises it'll turn off.

Sean Cummings

Well getting a tune from ZZP I would hope not to have a code at all!!! This was supose to be a package ready to go, well now I have an engine light due to a tune and have to spend 500.00 more to get it right! Not real impressed