blackss2.0

I had my car tuned two summers ago and after it was tuned I was seeing afr between 11.8-12.3 which was in florida weather and remained high even when I was in school up north in Maryland but within the last few months for some reason my wideband is reading quite a bit lower. More like 11.4 and if its cold out maybe it will hit 11.7-11.8. Anyone have an idea why this could be? I do have a leak between downpipe and exhaust but that wouldn't make it read richer so i dunno what to think. The wideband is only like two years old. I checked my spark plugs with my mechanic friend and he says they look good. Not to rich nor lean. Any ideas?

AndrewSS/TC

i think wideband o2's go rich when the are going bad. maybe someone else can chime in...

blackss2.0

Thanks. Anyone know?

yellowss7590

What are you talking about wide bands don't read rich when there's a leak? Lmao

damastah

im about the same.. when i go WOT my friends say there is a constant black stream coming out the rear of my car. sometimes i can see it by looking at my mirror... sometimes

drag210

same thing here i think my car was tuned than brought back to stock than i got it is there any way to tell if i was tuned

ebristol

iTrader: (4)

What you are experiencing is perfectly normal taking into consideration all the environmental changes between where you were tuned to where you drive your car.

ecot3c inside

iTrader: (11)

wideband o2's STOP when they die or just get stuck, a exhaust leak would actually make you leaner, and you never said if this was cruising or wot, im assuming wot?

mcottingham

There is a very simple way to check to see if you O2 sensor is toast. Put a bit of gasoline on a rag and place your sensor into it with the gauge turned on, it should go full rich and stay there. If your reading goes rich but then heads towards lean while still sitting in the rag you know you have a bad O2 sensor.

Do you have an HP Tuners kit?

Mike

Blowncavy

iTrader: (2)

WieRd

blackss2.0

If anything a wideband would read leaner due to more air passing by it is what i'm talking about..

blackss2.0

The car used to read leaner up north too though. Not just in florida. I also get a p0171 code often which is a lean code so I'm confused why my wideband says i' running richer then it used to.

ebristol

iTrader: (4)

It could be your fuel source. E10 verse 100% gasoline. Your wideband might need to be recalibrated? Dirty Maf...

There are a lot of things that could have happened. Clean all your sensors air filter.

Leafydialupking

iTrader: (1)

What wideband is it? Innovate needs to be re-calibrated ever 3000-6000 miles depending on use.

blackss2.0

It's aem so dunno if that still applies or not. How do you recalibrate it?

Leafydialupking

iTrader: (1)

AEM doesnt have the option to re-calibrate.

blackss2.0

Wish someone knew the answer to this. I have a misfire on cylinder one. I dunno if it's a stick injector staying open under wot or what but it's weird that when I first got the car tuned it would hit 12.3 and now it's at 11.0-11.2.

Sunburst_SS

well a misfire would cause unburnt fuel into the exhaust and cause you to run rich.....also a lean condition would cause the pcm to add fuel.....so you need to fix your misfire and lean code and you should be alright.

rouseySS/SC

If the injector may be gettin stuck open then that could be a cause of it because it's constantly dumping fuel when it doesn't need it which would cause it to run rich. Have you checked your plugs to see how they're looking?

blackss2.0

Yeah I dunnoo how to fix the misfire though haha

blackss2.0

I switched the plugs a few months back to see if that would help. They all looked good. No oil, coolant or anyting and the timing looked good on them. I guess I just gotta swap my injectors around and see if the misfire moves or not. There is also the possibility that it's misfiring in cylinder one just from my tune which has nothign to do with the rich air fuel.

The check engine light will stay off for weeks then go back on so I would think if it was the sticky injector causing the misfire that it would be on more frequently like whenever I floored it. I guess ill switch the injectors around and see.

Sunburst_SS

well, if you know you have a misfire on cylinder 1......do you have a way to monitor them?? Misfire at idle, or all the time, or just under load?? If at only idle you would either look for a vaccum leak at maybe an injector o-ring, or a bad valve.

You can try swapping injectors, and plug and coil with another cylinder and see if it moves. Check for vaccum leaks, and if nothing shows then check cylinder leakage and compression. But without looking at it for myself I wouldn't be able to say for sure.

rouseySS/SC

Is it a major misfire issue? I had a misfire issue not long ago I checked my injectors and harness all checked out then I checked vacuum lines and I ended up having a small leak, also if your misfiring I would take a look at your plugs again and see how they look it only takes a few minutes and see if cylinder 1 looks foul. Also have you checked your front o2 sensor?