Ok, my car started going into limp mode a while back...seemed to only do it under higher boost levels like 8lbs and up. I thought it was the MAF cutting out but we put Consult on it and said it was a p1237. Thats the passanger side wideband on the exhaust manifold.

Also we dynoed my car yesterday and I was off about 80hp from my original dyno. The cars feels great but isnt making any power like it should. On the dyno there was no CEL's but on the way home under full boost it when into limp mode again. Power it made at 8lbs was 325hp/350Tq LOL!


So my question is...can a wideband sensor bad under boost cause limp mode?


Thanks guys!

 

160 views and nobody knows?????

 

I would check your compression. Also your AFR is Real Rich from the looks of your dyno. That could be a big loss of power. Also looks like a timing issue starting at 5k up. Thats just my thoughts.

 

Fueling problem for sure... A/F jumping between pig rich and dangerously lean... probably some timing issues and knock above 5k...stay out of boost get it to a reputable VQ tuner ASAP before you break something.

 

^^^ a big plus 1 as that is a horrible a/f plot.

 

Forgot to mention that the blue line on the dyno is where the AF thingy blew off the tailpipe on the dyno. The other rich lines are what it is tuned too. I wanted him to tune the car rich but not 10.0! Thats crazy! Im thinking that the car was tuned in the dead of summer and its winter time now with cooler air temps...but wouldnt the car still try to reach its programmed AF targets regardless?

Were doing a complete re-tune in a week or 2. I also ordered a HPX Maf and will tune for higher boost if the motor and everything checks out. Also ordering two brand new Wideband sensors for the manifolds. The stock sensors have 117,000 miles on them LOL!

So does anybody here know if a bad wideband throwing a P1273 can cause a full limp mode condition under higher boost? Whats funny is the car wont go into limp mode under lower boost.

 

DTC: P1273

Search Bulletins/Recalls for P1273

Trouble diagnosis name: Air fuel ratio (A/F) sensor 1 (Bank 1) lean shift monitoring

Component Description:

The A/F sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element.

The sensor is capable of precise measurement λ= 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide λ range (0.7 < λ < air).

The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.

An electronic circuit controls the pump current through the oxygen-pump cell so that the composition of the exhaust gas in the diffusion gap remains constant at λ = 1. Therefore, the A/F sensor is able to indicate air/fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).

DTC detecting condition:

* The output voltage computed by ECM from the A/F sensor 1 (Bank 1) signal is shifted to the lean side for a specified period.

Possible cause:

* Air fuel ratio (A/F) sensor 1
* Air fuel ratio (A/F) sensor 1 heater
* Fuel pressure
* Fuel injector
* Intake air leaks

https://my350z.com/forum/maintenance...ml#post8356016

https://my350z.com/forum/intake-exha...ode-again.html

https://my350z.com/forum/tags/p1273.html

 

agreeeeeed +1