High idle & P0505! 2001 Max SE
03-17-2014, 07:06 PM
#1
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Join Date: Mar 2014
Posts: 4
High idle & P0505! 2001 Max SE
So, my 2001 manual maxima SE would stall on a cold morning if i didnt catch the rpms from dropping to 0. It would idle at around 500 until it warmed up then it would be at around 600. I had it scanned at autozone and they suggested that i cleaned that iac. So i did... Now my car always idles from 1200-1500 RPM. It makes driving manual pretty difficult. Any suggestions? Definitely not asking retardzone again...
03-17-2014, 07:18 PM
#2
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Join Date: Jan 2003
Location: California
Posts: 1,445
Looks like your IACV is due for a replacement.
How many miles on the car? Most IACVs fail between 120k and 160K miles, but there are exceptions in either direction.
You may already know that many people implement "coolant by-pass" because the coolant circulating through the IACV is considered a major factor contributing to IACV failure. Not everybody agrees - there are reports of IACVs that failed without any trace of coolant leakage.
How many miles on the car? Most IACVs fail between 120k and 160K miles, but there are exceptions in either direction.
You may already know that many people implement "coolant by-pass" because the coolant circulating through the IACV is considered a major factor contributing to IACV failure. Not everybody agrees - there are reports of IACVs that failed without any trace of coolant leakage.
03-17-2014, 08:57 PM
#4
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Join Date: Jan 2003
Location: California
Posts: 1,445
Re. "ECM goes when IAC goes" .... not always, but often.
The IACV winding fails by "shorting", and the short in turn fries the driver transistors in the ECU. I would recommend disconnecting your IACV at the first sight of P0505 occurence ... you might be lucky enough to catch it before the damage to the ECU is done.
You can drive your car without the IACV (although poorly) but not without the ECU.
The IACV winding fails by "shorting", and the short in turn fries the driver transistors in the ECU. I would recommend disconnecting your IACV at the first sight of P0505 occurence ... you might be lucky enough to catch it before the damage to the ECU is done.
You can drive your car without the IACV (although poorly) but not without the ECU.
03-18-2014, 08:07 PM
#5
Junior Member
Join Date: Nov 2009
Location: North Jersey, NJ
Posts: 35
So, my 2001 manual maxima SE would stall on a cold morning if i didnt catch the rpms from dropping to 0. It would idle at around 500 until it warmed up then it would be at around 600. I had it scanned at autozone and they suggested that i cleaned that iac. So i did... Now my car always idles from 1200-1500 RPM. It makes driving manual pretty difficult. Any suggestions? Definitely not asking retardzone again...
I've also had the cold start stalling issue, where I'd have to feather the peddle to keep it from dying until it was warm. I changed the MAF, checked for vacuum leaks, and replaced the upper intake manifold gasket. The culprit turned out to be a pcv valve. Replaced that and the car now runs perfectly in cold start conditions. It's about $5-8 from any parts store. I think it's definitely worth replacing it just to rule out the possibility.
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Justin Kroll
5th Generation Maxima (2000-2003)
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09-02-2015 11:06 AM