Question about Cars & Trucks
Replaced IAC, car still will not idle properly. I disconnected IAC from engine, would idle very roughly.
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Posted on Jan 02, 2017
This could be caused by several things. Bad MAF sensor, TPS could be defective. You need to have the vehicle scanned for codes. You can have this done for no charge at AutoZone.
Posted on Nov 18, 2009
SOURCE: 2001 taurus dohc codes 171
There is a large vac line coming straight down from the throttle body that goes to the PCV system. See if it has a hole in it. It is likely sucking air.
Posted on Jul 17, 2010
SOURCE: 1998 subaru rs impreza 2.5
Usually a vacuum leak will make the idle bog down rather than speed up, even if the ECU is compensating. It will be rough, but as you say, it's fine through the revs.
This leads me to think the PCV (postive crankcase valve) is not connected or is leaking. This raises the idle, although the ECU will suspect the IAC to be the problem. Check the PCV valve first.
Check the MAF sensor for dirt too.
Another point to make is the throttle body might be clogged/dirty. Get the intake manifold off again and clean it with petrol/carb cleaner and a toothbrush, check the condition of the rubber seals, if they are gunked up, the air speed will increase, causing a high idle. Check the exhaust manifolds for any build up/rust.
Finally, when were the O2 sensors last changed? If recently, are they the right way around? If not recently, try those, but make this the last resort as they can cost a lot.
I hope I have covered every eventuality as I can see how annoying this is for you. As you already mentioned, reset the ECu after each attempt.
Good luck, fire any questions back if you need.
Posted on Jul 18, 2010
Check the fuel pressure at the rail assembly, there should be a min of 40 lbs at the rails. Do you have any loss of power under a load? You may have an issue with your o2 sensor that is causing the ecm to send an improper signal to the engine ign/fuel map.
Posted on Dec 07, 2010
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