aoist Posted August 4, 2019 Share Posted August 4, 2019 (edited) My car won't increase or maintain idle rpm when under load. It keeps trying to decrease rpm till it nearly dies then jumps back up just to do it again in intermittent fashion. If I press on the accelerator pedal just a little, it'll like snap back to normal rpm. So I'm suspecting that what ever device that is supposed to increase rpm when the car is under load, D or R or even the air conditioner is not doing it's job. Anyone know what scheme/device is used on a 2003 pathfinder LX? Edited August 4, 2019 by aoist Link to comment Share on other sites More sharing options...
Mr_Reverse Posted August 4, 2019 Share Posted August 4, 2019 It is the idle air control valve. Most likely yours has failed in one or more of it's coils. Problem is that when it goes bad, it often damages the drivers in the ECU. Link to comment Share on other sites More sharing options...
onespiritbrain Posted August 4, 2019 Share Posted August 4, 2019 I am in search of the same answer if it’s pertains to the VG33 as well Link to comment Share on other sites More sharing options...
Sjackson2 Posted August 4, 2019 Share Posted August 4, 2019 3 hours ago, onespiritbrain said: I am in search of the same answer if it’s pertains to the VG33 as well Vg33 have an iacv also Link to comment Share on other sites More sharing options...
colinnwn Posted August 4, 2019 Share Posted August 4, 2019 When the IACV takes out the ECU, is that only if the failure is caused by coolant leakage into the coils, and if you bypass the coolant around the valve you should be OK and just need a new valve? Or can the valve damage the ECU even without leaking coolant causing the coil failure? Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
Mr_Reverse Posted August 5, 2019 Share Posted August 5, 2019 Usually the coolant leak is what damages the IAC valve. But anything that causes the IAC to require more current than normal to operate will burn out the driver transistors for the IAC inside the ECU. One reason that occasionally cleaning the throttle body and intake is a good idea. The 3.3 uses a different iac system that is more primitive and doesn't have the same issues of damaging the ECU that the VQ35 had in the early years. Link to comment Share on other sites More sharing options...
kdj Posted September 24, 2019 Share Posted September 24, 2019 Have you tried turning off your overdrive? Link to comment Share on other sites More sharing options...
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