Need tuning opinions / NOS problems

[Guest 614Streets]

I ran a very neat scan tool on my truck tonight and noticed that the 02 sensor indicated lean and the values werent moving around much. My Air/fuel gauge (intellitronix ) says otherwise but I know belive my o2 sensor is bad. It also went into open loop as soon as it hit Idle but I expect that since I run a low T stat. It did go closed loop when I got on it. I also saw that I could adjust my TPS sensor. I will replace the 0 2 sensor and hopefully it will survive.

 

My first holley TBI had the black injector caps the ones that hold down the injectors. Well a couple times they failed when the nut got loose and the injector pushed its way up and out of the bore. It basically flooded the engine for literally a day befor I really found the problem. I bet that wounded the 02 sensor?

 

I am unsure that my single wire sensor will be able to stay clean. Would most of you recommend a heated 3 wire type?

 

And do you guys belive that a bad o2 sensor would definately cause the motor to not work as good on the nitrous? The intellitronix gauge must not be all that great because this scanner I had was from Monroe and it is very very expensive. It really read between lean and rich but to the lean side?? The reading wernt moving around like they do on my elcheepo intellitronix unit. I played with the fuel pressure as well bring it down to 10 and up as high as 17(Its a TBI system) but neither ranges made a change on the scanner although I could smell the gasoline in the exhaust when she was high. My brother said it cost around $2800. It was a big hand held LCD + button unit and you could read everything real time. It could read timing and everything.

 

I also went from a ADS chip back to stock. I really used the ADS only because two reasons , I recieved it as a gift a long time ago , and I broke the OEM prom so I was stuck with it until a nice guy gave me another OEM. So that might also help the nitrous runs. It felt like it picked up alot of midrange torque with the OEM chip. Easy to tell because I had the ADS in there for ages.

 

So any opinions?

 

P.S. The a/c doesnt come on , is that beacause the OEM chip I recieved isnt burned for A/C use? I got it for free but thats something I plan on having even with the mini blower for next summer. By then I want to have a fully programmable ecm , we'll see. Sorry for the book, TIY.

[slow4now]

I don't think the O2 being bad will affect your N20 runs because when you are under WOT the ECU is in closed loop, and does not use the 02 sensor values to adjust fuel.

Have you checked your spark plugs? If you were running extremely rich you probably fouled your plugs out.

 

I don't know anything about your other questions, and to be honest I am just taking a stab in the dark with my replies but if I'm wrong I'm sure someone will correct me. tongue.gif

[Guest 614Streets]

So does that mean the computer doesnt do anything with the a/f once its in closed loop? If so it goes into closed loop before full throttle , I'll double check the values tommorrow after I set the tps to spec and I'll get a TPS /RPM reading for closed loop , but even at WOT in closed loop doesnt the 02 sensor read? The reading value didnt move around on the LCD at all at any throttle position. Im confused.

[Guest 614Streets]

Should be more specific , well I wasnt pushing the gas my brother was but , It looked like it went closed loop way before WOT. WTF? Is that normal? I saw the box indicate closed loop when he gave it gas off IDLE. On a good side note that dam Sun Pro Tach is right on the money!