UPDATE.
This whole time I have been avoiding doing the idle air volume relearn because i didn't think that would affect driving performance. Well wouldn't you know it, the second I did it everything is as it should be. It's amazing what one step in the process can do for the whole outcome.
My car works perfectly.
Thank you all again. You have been amazing.
Throttle Body - Throttle Plate Sticking?
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unoriginal
- Posts: 18
- Joined: Tue Jul 05, 2016 5:50 pm
- Car: 2010 Nissan Maxima SV
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centralcoaster33
- Posts: 2634
- Joined: Tue Apr 05, 2005 10:41 am
- Car: 1997 Nissan 240SX #5
- Location: Central Coast, CA
Re: Throttle Body - Throttle Plate Sticking?
I love a happy ending!
Re: Throttle Body - Throttle Plate Sticking?
Regarding checking the ECM ground, few multi-meters are sensitive enough to measure resistance to ground. A better method is to measure DC voltage between a ECM ground cable and true chassis ground ( i.e. battery ground). You can carefully route the wires to the multi-meter and measure this voltage while you drive. Speaker wires work for this, just make good connections. Use the relationship: Voltage = Current X Resistance. For example, if you have 12 volts going to the ECM and it normally draws 10 Amps (120 Watts), a ground line drop reading of 1.2 volts means the resistance is 0.12 Ohms. While 0.12 Ohms is difficult to read with typical multi-meters, a 1.2 volt reading is easy and a better indicator of problems since the ECM needs the correct voltage. A 1.2 volt drop in the ground line would mean the ECU is getting 1.2 volts less than it should. Most ECMs tolerate several volts drop.
BTW, I have a 2011 Maxima S and am having similar problems, but the hesitation and stuttering occur after I start driving, whether the outside air temperature is hot or cold. I verified it was not the Accel Pedal Sensors because I have the same problem with CC, which does not follow the pedal position. I suspect the Throttle plate is sticking, possibly due to buildup. The problem comes and goes while driving, but goes away for a few minutes after hard acceleration (Throttle Body Housing heats up and expands). Not sure if this is the same root cause as you see, but wanted to mention it. I do not have a diagnostic tool, but when I set the status display to read instantaneous MPG, I can see it fluctuate ( 25 to 50 MPG) with constant pedal position on a smooth level surface, which coincides with the hesitation and stuttering. Going after TB cleaner, but not optimistic. Still concerned about transmission problems creating a load.
The dealership was of course worthless, except for their excellent cashier who I have seen too many times. They tell me it's not throwing any codes and said it must be my aftermarket wheels ( of course I had the problem with OEM wheels with snows and all season tires:)
BTW, I have a 2011 Maxima S and am having similar problems, but the hesitation and stuttering occur after I start driving, whether the outside air temperature is hot or cold. I verified it was not the Accel Pedal Sensors because I have the same problem with CC, which does not follow the pedal position. I suspect the Throttle plate is sticking, possibly due to buildup. The problem comes and goes while driving, but goes away for a few minutes after hard acceleration (Throttle Body Housing heats up and expands). Not sure if this is the same root cause as you see, but wanted to mention it. I do not have a diagnostic tool, but when I set the status display to read instantaneous MPG, I can see it fluctuate ( 25 to 50 MPG) with constant pedal position on a smooth level surface, which coincides with the hesitation and stuttering. Going after TB cleaner, but not optimistic. Still concerned about transmission problems creating a load.
The dealership was of course worthless, except for their excellent cashier who I have seen too many times. They tell me it's not throwing any codes and said it must be my aftermarket wheels ( of course I had the problem with OEM wheels with snows and all season tires:)