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05 525i rough idle
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#1
10-29-2014, 08:44 AM
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05 525i rough idle
Guys,
Still helping a buddy with his car. It has been having a rough idle for some time. While driving everything is fine, but at idle upon startup it gets lumpy (for lack of a better term). Also, when pulling into a parking spot, prior to shifting into park, or even while in park, it also gets lumpy and almost hunts for the right idle speed. Last time he brought it over I was able to track down what I thought was a slight air leak at the crank case valve breather hose. He replaced the hose and the idle smoothed out for awhile but after a month is now back to the regular lump. I don't know enough about these cars, so I am posting here. I'm hoping you guys can tell me what else it might be. A sensor of some sort maybe? Thanks
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Ryan 1976 911S Targa 3.2 swap 
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#2
10-29-2014, 09:38 AM
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Interested as well. One of the reasons I was asking about a service place besides the valve noise is a hunting idle.
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Martin 2011 Cayman S (Gone) - Hardtop Blechster 2006 Cayman S (DD) 2016 Mazda CX-5 (Her DD) 2002 Boxster S (Gone) - Ragtop Blechster - Pura Patina! Dorkiphus: I buy it for the articles
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#3
10-31-2014, 11:13 AM
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Ryan, did you pull the idle control valve and clean it up? looks just like the one on your 3.2...pull it and use some carb cleaner to clean it out real good as well as the associated hoses...could be clogged and not moving freely.
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Tito 82 911 SC with 3.2 73 RSR project 97 328is 99 328is 97 Lexus SC300 Manual 86 TL (gone) 993 (gone) 75 911S (gone)
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#5
11-02-2014, 11:11 AM
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Vacuum leak. Like Lupus it's one of the last things that considered.
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David I hope to arrive to my death, late, in love, and a little drunk! Just because I don't care doesn't mean I don't understand... Homer Simpson "That's what's keeping me out of F1.... Too much mental maturity...." N0tt0n Some cause happiness wherever they go; others whenever they go. CHAOS, PANIC, AND DISORDER my work here is done... Live without pretending, Love without depending, Listen without defending, Speak without offending
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#6
11-03-2014, 12:52 PM
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TR- we checked for vacuum leaks and that's how we found the breather hose.
Jerome- Current mileage is 125k and the plugs were done around 5k ago. (Could the plugs be gapped incorrectly and causing it? He did the plugs on his own.) Tito- no idea on the ICV. I will look up its location and check it when he brings the car over.
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Ryan 1976 911S Targa 3.2 swap
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#7
11-03-2014, 06:29 PM
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Bad coolant Temp sensor??
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Chris Robel Current: 1987 Carrera Targa 3.4 993SS cams, Smokey Silver Semi-Daily Driver 2006 Cayman S, Guards Red, #11 part time track addict (sometimes #12 or #22) X-Terra, Blue Sold: 1970 911 T coupe, Bali Blue 1982 911 SC Targa, Guards Red 1974 914 2.0, Champagne Gold 1982 BMW 528e, White and rusty.. Deceased but not forgotten: 1968 911 sunroof coupe, Black 1972 VW Super Beetle, White
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#8
11-05-2014, 05:58 PM
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I'm going to assume that since you didn't mention it, there is no CEL on, or codes stored. At this mileage, I would be checking the DISA valve to make sure that it is intact. You should also be looking at the CCVV and it's associated hoses. The oil return hose (goes from the bottom of the CCVV to the dip stick tube. Also check the intake boots. If the idle issue is more obvious when ambient temps are low, it could be VANOS seals.
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Searchin' for my lost shaker of salt. Clarke '79 SC Euro '93 BMW 325is '54 Chevy 210
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