DOESN'T RUN GOOD AFTER DYNO TUNE

[CONCRETEWARFARE]

waiting on my paycheck to get the o2 sensors and ill let you guys know. Maybe that is why I dynod so low.

 

[vristang]

doesn't it start reading more than just the O2 Sensors when i hits closed loop?

The other sensors are still used during OL...
It is only the O2's that are ignored during OL.

By definition, CL means there is a feedback signal, which in this case is the O2's.

The ecu always uses the other sensors.


jason

 

[vristang]

waiting on my paycheck to get the o2 sensors and ill let you guys know. Maybe that is why I dynod so low.

Yeah, O2's aren't cheap...

I don't think you will see much of a WOT increase with the addition of O2's, but it is possible that with some run time the adaptive will help WOT. How much help, I can't say.


Out of curiousity, how long has the car been running without the O2's?
Did the shop remove them?



jason

 

[CONCRETEWARFARE]

Nah I just never connected them after I removed all my smog stuff because I thought they had to do with emissions. The wires hit against the exhaust so I cant just reconnect them else I would. Plus I have ran race fuel also and from what im told that ruins them also.

 

[CONCRETEWARFARE]

So do you think that replacing them I will see some low end torque increase. I feel like im lacking low end maybe that has to do with it?

 

[CONCRETEWARFARE]

Ok so I finally put in new o2 sensors and for a few days everything seemed fixed. The hanging and uncontrollable idle went away and it didnt smell rich anymore. Now after taking a trip on the highway about 25 miles each way the idle is surging again and you can see looking at the tailpipes that it is running rich besides being able to smell it. What could be going on here? Fuel pressure never changed because I checked to see if that went up but it didnt.

 

[vristang]

Ok so I finally put in new o2 sensors and for a few days everything seemed fixed. The hanging and uncontrollable idle went away and it didnt smell rich anymore. Now after taking a trip on the highway about 25 miles each way the idle is surging again and you can see looking at the tailpipes that it is running rich besides being able to smell it. What could be going on here? Fuel pressure never changed because I checked to see if that went up but it didnt.

It could be any number of things...

Have you checked for codes?
Verify that the grounds are in good shape. Especially the Orange ground for the O2's, which is on the firewall near the back of the drivers side head.

That is all I can think of right now
good luck,
jason

 

[DMAN302]

No offence to anyone but I know when I had cold start issues my tuner not only took interest in getting it corrected but actually offered to come to my home to assist me in correcting the issue so I wasn't inconvenienced. THAT is what a capable tuner should want....to ensure you're not only happy with his service but that the car is working to the best of his abilities. That there is the reason I wear his shop decal (only decal on my car) in bright white letters on my rear window.

 

[CONCRETEWARFARE]

yea i guess ill check the grounds today. The only weird thing to me is that it seemed like as soon as i put the o2 sensors in everything was fixed. Now that I took it on that little trip which by the way I didnt speed or beat on the car because that was the first time I went that far since it ran good and now its acting funny.