Trouble with Throttle Body 2003 Infinity i35

[Joe Marconi]

I think is problem is worth sharing.

 

While removing the intake plenum on a 2003 i35 infinity to replace the rear plugs, the tech noticed that the throttle body was heavily carboned-up. The tech cleaned the throttle body. After he reinstalled the plenum, he noticed that the idle would not come down below 1000rpm and after 5 minutes the check engine light came on logging an error code for RMP out of range.

 

After unsuccessfully attempting to perform an idle relearn through the scanner, we concluded that the throttle body had failed. We researched the problem and found a lot of know issues with this system. Apparently, throughout the years, the carbon build up closes around the throttle plate reducing the normal air flow and the computer makes corrections. By cleaning the throttle plate, now the idle is too high and for some reason the computer cannot bring down the idle.

 

The fix: replace the throttle body motor and perform idle relearn.

 

Try explaining this to the customer!

[CARMandP]

Thank you for that one. I cleaned the throttle body on an 03 Altima and had an idle problem. There is a way on that car to mechanically perform the throttle stop position so it would idle correctly. I didn't know I had to do that one

[Joe Marconi]

Thank you for that one. I cleaned the throttle body on an 03 Altima and had an idle problem. There is a way on that car to mechanically perform the throttle stop position so it would idle correctly. I didn't know I had to do that one

 

We too have cleaned many v6 Nissans, performed the idle relearn through the scanner with no problems. But this one bit us in the "you know what"!

[xrac]

At a class that one of our tech attended recently we were told that on certain late models of the Infinitis and Nissans that the throttle body needs to be removed from the car prior to cleaning. The spray used on the throttle body could get down into the throttle body motor and damage it if the cleaning is done on the vehicle.

[Alex]

* Adjusted thread title to reflect the vehicle with the issue, for better searches.

[Joe Marconi]

At a class that one of our tech attended recently we were told that on certain late models of the Infinitis and Nissans that the throttle body needs to be removed from the car prior to cleaning. The spray used on the throttle body could get down into the throttle body motor and damage it if the cleaning is done on the vehicle.

 

That could be what happened. We need to be more careful with all newer vehicles. The learning process can sometimes be costly.