Multiple IACV questions.
05-09-2006, 11:49 AM
#1
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Join Date: Jul 2004
Posts: 701
Multiple IACV questions.
I was wondering if someone could explain in detail exactly what an IACV really is and what flows inside the two tubes that it is connected to.
Reason for my question is because like many other users on this forum, I cleaned out my T/B to later get the SES light.
The code pulled was Idle too high, IACV. I never really got a chance to change the IACV until a few weeks ago (9 months later).
I took the sensor off the entire metal thing and just installed it into my IACV slot. There was no SES light for about 150 miles since I did it. As soon as I hit the highway, the ugly light returned.
Could it be that because I didnt install the metal peice, the IACV is still not working properly. Afterall, I thought air traveled through it.
I heard that people had to replace their computer (ecu/ecm).
I thought of that too but the light does not go on right away like all the others yet waits for me to drive at high speeds before it goes on. I have already tried to buy a computer but was warned that I would have to get it reprogrammed to understand my key.
What do you guys think.
Reason for my question is because like many other users on this forum, I cleaned out my T/B to later get the SES light.
The code pulled was Idle too high, IACV. I never really got a chance to change the IACV until a few weeks ago (9 months later).
I took the sensor off the entire metal thing and just installed it into my IACV slot. There was no SES light for about 150 miles since I did it. As soon as I hit the highway, the ugly light returned.
Could it be that because I didnt install the metal peice, the IACV is still not working properly. Afterall, I thought air traveled through it.
I heard that people had to replace their computer (ecu/ecm).
I thought of that too but the light does not go on right away like all the others yet waits for me to drive at high speeds before it goes on. I have already tried to buy a computer but was warned that I would have to get it reprogrammed to understand my key.
What do you guys think.
05-09-2006, 01:21 PM
#2
occacuonaly the ecu and iacv do have to be replaced together, but to my understanding this is not always!
the iacv controls the amount of air entering the engine at idle, and the low rpm range (i think), acting like adjustment for the throttle valve, to add or take away very small amounts of air. the fluid running through is coolant.
if u only replaced the black sensor that is ur prblem, there is another small sort or butterfuly valve inside the metal housing that usually gets very dirty. the iacv needs replacing as a whole unit, including metal housing.
try replacing the entire unit and disconnect the battery for 24hrs to reset ecu.
btw i just bought a new one, replacing it this week.
the iacv controls the amount of air entering the engine at idle, and the low rpm range (i think), acting like adjustment for the throttle valve, to add or take away very small amounts of air. the fluid running through is coolant.
if u only replaced the black sensor that is ur prblem, there is another small sort or butterfuly valve inside the metal housing that usually gets very dirty. the iacv needs replacing as a whole unit, including metal housing.
try replacing the entire unit and disconnect the battery for 24hrs to reset ecu.
btw i just bought a new one, replacing it this week.
05-10-2006, 10:07 AM
#3
Donating Maxima.org Member
Thread Starter
Join Date: Jul 2004
Posts: 701
Originally Posted by super6
occacuonaly the ecu and iacv do have to be replaced together, but to my understanding this is not always!
the iacv controls the amount of air entering the engine at idle, and the low rpm range (i think), acting like adjustment for the throttle valve, to add or take away very small amounts of air. the fluid running through is coolant.
if u only replaced the black sensor that is ur prblem, there is another small sort or butterfuly valve inside the metal housing that usually gets very dirty. the iacv needs replacing as a whole unit, including metal housing.
try replacing the entire unit and disconnect the battery for 24hrs to reset ecu.
btw i just bought a new one, replacing it this week.
the iacv controls the amount of air entering the engine at idle, and the low rpm range (i think), acting like adjustment for the throttle valve, to add or take away very small amounts of air. the fluid running through is coolant.
if u only replaced the black sensor that is ur prblem, there is another small sort or butterfuly valve inside the metal housing that usually gets very dirty. the iacv needs replacing as a whole unit, including metal housing.
try replacing the entire unit and disconnect the battery for 24hrs to reset ecu.
btw i just bought a new one, replacing it this week.
If I was to replace the entire IACV, i would have to drain the coolant in the radiator?
05-10-2006, 01:15 PM
#6
Originally Posted by Gennady7
Is there a write up on how to remove the IACV unit?
remove the whole tb (4 bolts) and disattach the two hoses (will be a bit messy with the coolant, use a rag underneath). then there are 5 small screws holding the iacv, make sure to use a properly fitting screwdriver cause the will strip very easily.
be sure to rrplace gasket (new unit comes with one) if u are just cleanning it, ull need to make one from gasket material, i highly suggest not trying to reuse old one it will leak, mine did!
rebolt and reconnect hoses and connectors!
05-10-2006, 03:28 PM
#7
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Join Date: Oct 2005
Posts: 33
i had the same issue cleaned the t/b and roughly around 100kms ses light came on
replaced the iacv, tried to reset the computer by unpluging it nothing
went to the stealership and they said my ecu needed to be replaced which was around 1000$ installed.
later i tried a consult 2 test and now my car ses light is off and car idles around 580 600 so...
this is just a sugesstion best of luck
replaced the iacv, tried to reset the computer by unpluging it nothing
went to the stealership and they said my ecu needed to be replaced which was around 1000$ installed.
later i tried a consult 2 test and now my car ses light is off and car idles around 580 600 so...
this is just a sugesstion best of luck
05-10-2006, 07:04 PM
#8
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Thread Starter
Join Date: Jul 2004
Posts: 701
Originally Posted by Spliff_Star91
i had the same issue cleaned the t/b and roughly around 100kms ses light came on
replaced the iacv, tried to reset the computer by unpluging it nothing
went to the stealership and they said my ecu needed to be replaced which was around 1000$ installed.
later i tried a consult 2 test and now my car ses light is off and car idles around 580 600 so...
this is just a sugesstion best of luck
replaced the iacv, tried to reset the computer by unpluging it nothing
went to the stealership and they said my ecu needed to be replaced which was around 1000$ installed.
later i tried a consult 2 test and now my car ses light is off and car idles around 580 600 so...
this is just a sugesstion best of luck
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