just put on the ecu and harness on my rev up motor . i had to sync the ignition to my ecu which is done but my old o2 sensors dont plug up. nissan made them with different connectos which sucks, but anyways , im not running any 02 sensors pluged in so cars running crappy, idle is at 750 to 1200 range . the car when i get on it feels like it wants to leapout and rip tires but then it 's like it hits a slump and goes nowhere ,can just o2 sensors cause this to happen?

 

the O2 sensors for the rev-up were wideband O2 sensors. You need different sensors. At least the 2 pre-cat are.

You will also need to relearn the idle air volume to get idle where you want it.

 

can i do the relearn just by doing like the gas pedel key set?

 

yes...straight forward. Get it all set ?

 

ok im not throwing any codes that turn on check engine light but car still performs like crap and still idleing around 1200 im baffled!

 

thats where our car usually idles....cold start is around 1500 then goes down to about 750 when hot....

 

Yea except. My car stays at 1200 never drops

 

you need to reset the idle air....its still not reset.

warm the car up first...then perform the idle air volume reset. Let the idle drop for a while. It took me 90 seconds to get the idle to drop down to 680 where it normally is.

 

Wwilly wouldn't it throw a check engine light? Cause it's not now and would this cause the loss of power?

 

ya try that i believe the instructions for this is on motordyne's web site...

 

ok so i gave in and went to the dealer, the scan tool they used didnt even register the ecu , so they told me the ecu is no good this is why when i did the relearn procedures this didnt work..

 

Not sure the car would even run at all if "the ecu was no good". Need a better explaination than that.

But yes, the car would run like doo doo with no 02 sensors. Might have ran okay while it was still in open loop though.

 

well they told me the ecu is working but not responding and they cant get the ecu to do what they want , they cant even get it to retard timing or change idle but i dont know this is why i brought it to them , car has 02 sensors

 

That is very weird... So they were unable to communicate with the ECU altogether?

Is the ECU programmed to your ignition yet?

 

No, the TB being off will not throw a CEL. It can...but only does that after driving/starting it a lot. I ran my car with a bad TB for almost a month. It worked after I replaced my TB.