Hi all:
A few times now, I've noticed my idle at stoplights will be at around 1300 rpm rather than the usual 700-800 rpm. If I step lightly on the accelerator, it will settle back down to where it should be. Does the throttle mechanism/linkages ever need cleaning and some sort of lubrication? Or is this indicative of cleaning the MAF sensor and/or throttle body? Neither have been done since new. Car has 78k miles.

 

Hey,

I just went thru this same issue recently. What worked for me was cleaning the MAF, the throttle body and the IACV. I removed the throttle body and cleaned both sides and removed the IACV, took it apart and cleaned thoroughly. It behaved just like you described and now it's idling at around 700.

Hope this helps.

 

I’d think a check of the TPS voltages and adjustment might be in order as well.

 

mcz0119... Did you take off the throttle body for cleaning and if so, did you replace the gasket on the manifold side? Nissan tells me there is a gasket on the manifold side of the throttle body and also one on the IACV. I'm seeing zero instructions in my FSM how to remove both of these. I'm off to try the search function and check YouTube.

 

You can clean the throttle body in place.
Buy throttle body cleaner. Find an old toothbrush.
Remove the rubber boot from the air filter housing.
Spray the cleaner inside the trottle body and onto the throttle plate Start scrubbing.
Next, prop the throttle wide open. Scrub the back side of the throttle plate, and it's edges. Spray it down some more to hose off the crud.

Any crud which enters the intake manifold won't cause problems.
​​​​

 

Thanks JvG. I saw on some videos folks commented it is best to remove the throttle body to prevent the dissolved crud from now going into the manifold and that's why I asked. I was thinking some paper towels wrapped around a screwdriver soaked in cleaner (think giant Q-tip) for that portion of the job to retain the crud on the towels.

 

I neglected to mention that I use paper towels for the rest of the scrubbing, and to remove most of the crud. Impliments like long nose pliers, screwdrivers, bits of wire can move the paper towels around as desired.

 

I didn't replace the gaskets as they're fairly new. I did apply some gasket adhesive to them before reinstalling. Like JvG said you don't have to remove the throttle body to clean it but I wanted to give it a good cleaning since I'd been dealing with the idling issue for weeks.