Jarebear Posted January 3, 2013 Share Posted January 3, 2013 So yesterday I cleaned my MAF sensor with electronic parts cleaner and now my car is idleing particularly low, I reset the light by pulling the battery cables. Maybe the computer is relearning the idle? Any takers? Quote Link to comment Share on other sites More sharing options...
landar Posted January 3, 2013 Share Posted January 3, 2013 Did you pull the code first? The on-board diagnostics is trying to talk. OBDII is your friend. :whistles: Quote Link to comment Share on other sites More sharing options...
Jarebear Posted January 3, 2013 Author Share Posted January 3, 2013 Yea I pulled the code, that's why I cleaned the sensor, it was p0172 rich, I cleaned it and the light has stayed off, even with the idle, sometimes it'll idle normal and sometimes it'll idle lower, both when warm. Maybe air intake valve? Quote Link to comment Share on other sites More sharing options...
Jarebear Posted January 3, 2013 Author Share Posted January 3, 2013 But I did only do it last night, I drove it to a nearby city and back, and I drove it around plenty this morning, I'll keep you posted Quote Link to comment Share on other sites More sharing options...
curiousB Posted January 3, 2013 Share Posted January 3, 2013 Take at look at the OBDII fuel trim values for long term and short term. They may offer a clue. An air leak in the intake ducting or the intake manifold can play havoc with idle. It introduces air that is unmetered (leaky air isn't detected by the MAF) so the computer tries to compensate with lean/rich trim by looking at the primary O2 sensors. You can do the unlit proane torch trick to see if you have leaks. Do it outside though. Alternatively if its a cracked duct or ruputured tubing it might be quite audible. get a 2' length of hose holding one end near your ear (not stuck in your ear!) and move the other end around to suspicous places. You'll hear a whistling sound of air if there is a decent sized leak. Quote Link to comment Share on other sites More sharing options...
redsteve Posted January 10, 2013 Share Posted January 10, 2013 Hello Jared, a few months ago I cleaned the MAF sensor and throttle body on my MK IV. When I bolted it all back together the revs were way too high. However, after driving around for a few miles in stop and start traffic making sure to shift from Drive into Neutral and Park a few times the revs settled back to their normal level. I am no expert but I think the Throttle Position Sensor has to reset itself after the airflow has been changed. I hope this helps. Steve. Quote Link to comment Share on other sites More sharing options...
Jarebear Posted January 10, 2013 Author Share Posted January 10, 2013 Yes. I noticed after driving it for a while the idle corrected itself. Quote Link to comment Share on other sites More sharing options...
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