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Old 07-04-2017, 11:41 PM   #1
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Repaired disa still rough cold idle

02 325i sedan
I know this has been discussed, but i was unable to find any discussion re: a DISA rebuild with the idle getting rougher. Any thoughts? I disconnected the Intake VANOS plug, no difference on cold idle.
The DISA rebuild went well--but when I open the flap on it, and hold my finger on the vacuum port it holds ok but doesnt stay all the way. DISA still good?
Appreciate anyone that went through this stage


Last edited by Broo102; 07-05-2017 at 12:10 AM.
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Old 07-05-2017, 06:37 AM   #2
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My Ride: 2001 330Ci
Repaired disa still rough cold idle

There are a myriad of issues that can cause your symptoms. The first step is to scan the engine computer (DME in BMWeze) and the automatic tranny computer (EGS) for codes. Btw, if your car has a manual tranny it doesn't have an EGS. Then post the codes.

I'm betting that there are vacuum leaks in the intake system. Yes, you wrote that everything looks fine, but these cars, due to emissions requirements, are very finicky about vacuum leaks. The only way to find all the vacuum leaks is to smoke test the intake system.

Last edited by markusmarkus; 07-05-2017 at 06:40 AM.
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Old 07-05-2017, 01:27 PM   #3
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Thanks Markus
I should have explained more symptoms.
The codes I got in the past are 300 313 1353 1351 maybe a few more, I cant recall. The car shakes, weak power, and rough idle at cold start, but when I turn it off after 20 to 30 sec. or so, it is fine, runs smooth. I would think a vacuum leak would show up all the time? After it smooths out, the idle does not fluctuate like a vacuum leak. I checked the MAF boot and hoses for cracks, nothing.
Any other ideas would be welcome!

Last edited by Broo102; 07-05-2017 at 01:47 PM.
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