Nissan Frontier Forum banner

1 - 7 of 7 Posts

·
Registered
Joined
·
4 Posts
Discussion Starter #1
After receiving advice on my issue, I replaced the Idle air control valve. $130 at AutoZone.
At first I thought my issue was corrected on cranking the engine and running it for a few minutes. Took it for a spin.
At my first stop, the pulsing began again.

Any ideas. did not do the idle relearn.

Joe
 

·
Registered
Joined
·
169 Posts
Vacuum leak? The factory service manual has a diagram of all vacuum lines. Old lines can get cracked and leak, then air bypasses the IAC so the computer doesn't know what to do.
 

·
Registered
Joined
·
520 Posts
Coolant level good? Low coolant will make the engine speed pulse.
 

·
Registered
Joined
·
10 Posts
Hi, I just rescently had the same problem. Replacing the temp sensor, cleaning mass air flow and finally changing the iac, $60 amazon. Nothing helped. When I did the mass air flow, I used a QTip and alcahol. I did it wrong. Later I went back to clean it again, this time no QTip. It's easy, just 2 sews hold it on mine. It's a black 1 1/2" plastic piece on the passenger side of the throttle body. Pull it out and it has sort of a light bulb looking filament on the inside. That's the part that I sprayed with some electronic cleaner. I guess carb cleaner is too harsh. Let it dry for about a minute or less then put back on. You should be good then.
 

·
Registered
Joined
·
6 Posts
I have this same issue. It's a vibration through the steering wheel and pedals when at idle. When I look at my RPMs I can see them fluctuating between ~550 ~700. This happens with or without the defrost/heat on. Some people on these forums say it's a consequence of the compress or electric fan kicking on and the engine ramping up a bit to compensate for the increased power burden.

There was also a technical bulletin put out by Nissan for '10 - '12 Frontiers and Xterras that were having rough idling issues. It had to do with the ECU programming. I think it called for the idling speed to be reprogrammed in the ECU. I have no idea to do this, so I looked for alternate solutions and found this:

ECU Resetting Procedures

Timing is extremely critical. If it is NOT DONE within the specify time, the ECU will not reset and the Check Engine Light (CEL) will continue to remain ON. A stop watch or an analog clock with a second’s needle will be useful.

Operations Procedures

1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
2. Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds.
2a. Fully depress the accelerator pedal (HARD).
2b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking.
4. Fully release the accelerator pedal (while the CEL is still blinking)
5. Wait about 10 second.
6. Fully depress the accelerator pedal and keep it for more than 10 seconds.
7. Fully release the accelerator pedal (The CEL light will continue to blink).
8. Turn ignition switch to “OFF” position and now you can start the car. The CEL light should be gone.
If the CEL light continues to remain ON, repeat the above steps. Timing is EXTREMELY critical to resetting the ECU.

Edit: Added the "Easy Method" for ECU Reset

The Easy Method:

After experimenting with different timing, and reading posts by other members, I've come up with a condensed method of doing this reset. This method works EVERY time, even w/o a stopwatch. I've used this method successfully a dozen times, or so, now w/o a watch. After a few times, you won't need a watch or instructions. You'll get so darn good at it, you'll find yourself doing it while waiting at a traffic light.

Timing is not as critical with this method...no stop watch needed. Just count in your head...one-one thousand, two-one thousand, etc, or use stop watch. The most critical step is step #3....wait 10 sec, instead of 7.

1. Ignition "ON", count to 3.
2. Depress/Release pedal 5 times...hard and fast.
3. Count to 10 (not 7!) and fully depress pedal
4. Count to 12 (SES should be blinking), release pedal
5. Count to 10, depress pedal
6. Count to 10, release pedal.
7. Turn off ignition, then start engine. Done!



Haven't tried it yet, but I will try it later today after I get out of work and let you know what happens.
 
1 - 7 of 7 Posts
Top