draxcaliber

So I have a turbo toyota's simple kit and I am using an AEM wideband 02 sensor, I was having trouble for a while with the wideband reading full rich even under full engine braking. the gauge would read 10.0 to 10.2 contantly. Eventually it started also saying P00, P01 and P02.

I got a new O2 sensor and the car was also tuned by P-tuning two weeks ago, my friend replaced the sensor just this past saturday, but the problem with the O2 sensor still persists. I am still getting full rich a/f ratio readings for extended times. The car is running great. Any idea what the problem could be?

paul_dezod

Charge pipe might be dislodged.....It's a pull through MAF setup right?

PeArLwHiTe07tC

iTrader: (2)

Just outta curiosity paul, what do u mean by the charge pipe being dislodged?

paul_dezod

On a pull through MAF setup like ours, TT, GReddy etc, if a charge pipe comes disconnected the wideband will read dead rich. It's actually a great trigger finder for problem solving like this.

PeArLwHiTe07tC

iTrader: (2)

Ooooohhh. U threw me off with the fancy wording. Lmao. In his case, i smell a possible boost leak test may be in order.

borderguy881

iTrader: (-1)

Christian if the car runs fine and the wide band is pegged full rich then either the gauge or the uego sensor is bad, a car running 10s for AFR will buck around town

draxcaliber

My turbo kit is a hybrid kit at this point, part turbo toyota's simple kit, (turbo, manifold, intercooler), but it has the intake plumbing for the P-tuning kit, so it is now a blow through MAF sensor. It has been doing this for a while now (since when it was a pure turbotoyota's kit). I'm trying to remember if it also happened while it was supercharged, but I can't completely recall.

Sensor has been replaced with a brand new one from P-tuning, So I guess it could be the gauge itself? or could it be a bad connector on the gauge? that would be a bummer. needing a new gauge, oh well, new o2 sensor might be for sale then!

sebbyxtc

iTrader: (7)

Check your couplers and piping. Maybe you blew off a coupler.

Syldrin

iTrader: (1)

i'd bet drax already checked that. i would look for a crack in your manifold man. mine cracked between runners 2 and 3 and i had to have it repaired.

borderguy881

iTrader: (-1)

Guys your trying to suggest that he may have some sort of intake leak or boost leaks but this is clearly not the issue, the car will NOT DRIVE FINE. At a true 10-10.8 AFR that is fact

borderguy881

iTrader: (-1)

Here is a test for you Christian, turn your ignition switch on so the gauges turn on, keep car off, report back with what the hair says after 5 minutes Pretty sure it should read 14.7 or ---

Syldrin

iTrader: (1)

not true border. if it's a cracked mani it wont let exhaust gasses escape except at a certain temp/pressure.

borderguy881

iTrader: (-1)

Your correct that a exhaust leak would throw off the readings but exhaust leaks = lean readings and also a Mani leak would also throw off the primary o2 readings , only way I can see the uego reading rich from an exhaust leak is if, the primary o2 is getting lean readings and telling the Ecu to add fuel, this making it run rich which again he would know if it were rich

Syldrin

iTrader: (1)

I'm just saying from experience what happened to my car with the same manifold. Mine didn't read full rich but it did read richer.

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paul_dezod

What's the diameter of the new blow through pipe the MAF sits in?

draxcaliber

3 inches, I think the old TT plumbing was 2.5 inches.

Syldrin

iTrader: (1)

2inch hot side 2.5 cold side drax.

ESEMRFOZZ13

that was length, and girth if only the bank account kept reading rich.

DeAnzaJig

well an exhaust leak can cause an "actual" rich condition if its before the primary 02 sensor, but it would have to be one hell of a leak to cause it to be 10.0. and at that point im pretty sure you would be able to hear that.

my money is on the tune/maf setup. or the gauge. find someone with the same gauge and just plug it into the harness and see if it reads better. or just turn on your gauges after a few hours of downtime, and it should read "---" after about 20 seconds after its been turned on. if its still full rich, its the gauge. if not, call your tuner

DeAnzaJig

also changing the MAF size from 2.5 to 3 inch would NOT cause a rich condition. it would cause a lean condition IF it has not been tuned for it. the more volume inside the piping would cause less voltage being read at the MAF, telling the ecu to add less fuel than normal. when in reality there is more air going in than it thinks its reading.