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1999 BMW 528 misfires and code 1397

Tiny
EZRA76
  • MEMBER
  • 1999 BMW 528
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
My 1999 bmw 528 started to run really rough. I pulled some codes and found misfire codes for almost all cylinders an 02 sensor code and a 1397. Sounds like an air leak under the intake manifold. Any suggestions Thanks
Wednesday, June 3rd, 2009 AT 9:22 PM

7 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Ezra, what method was used to extract those codes and did you include all of them?
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Wednesday, June 3rd, 2009 AT 9:28 PM
Tiny
EZRA76
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I used a scanner to retrieve all the codes. They were mostly cylinder misfire. I did found a vaccum hose that was bad and replaced it. After reading several articles here it makes me wonder if it could be fuel related because whenever I sprayed carburator cleaner around the leaking hose it ran great. After I replace the hose It kept running very rough. Perhaps there is not enough pressure from the fuel pump or pumps?
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Wednesday, June 3rd, 2009 AT 9:40 PM
Tiny
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Where was the leaking hose? What was the size of the hose? You are on the right track mate, your issue is a leak, now we can find the extent of the repair needed.
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Wednesday, June 3rd, 2009 AT 10:07 PM
Tiny
EZRA76
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  • 4 POSTS
The leaking hose was a hose from the bottom of the intake manifold to the top of the oil pan fitting next to or attached to the oil dipstick. I've replaced it and it made very little difference. I also hear a pinging noise every 10 seconds when the vehicle was cold?
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Thursday, June 4th, 2009 AT 3:55 PM
Tiny
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It is possible the cyclone separator has failed and is causing this issue. BMW engineers like to call this part a pressure regulating valve and the part can be found at Realoem. Com and the part# is 11-61-7-501-566. Also consider replacement of the adjacent hoses due to age and possible cracking.
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Thursday, June 4th, 2009 AT 5:07 PM
Tiny
EZRA76
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I will look at all the hoses under the intake and the
fuel pressure regulator. Where and how do I test the fuel pressure regulator? Does it have a vacuum hose on top like the old vehicles. Thanks
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Thursday, June 4th, 2009 AT 7:04 PM
Tiny
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Ezra, I think there is a misunderstanding and I want to clean it up right now. The site I want you to visit is called Realoem. Com. Put in the part number I gave you and look at the part and see where it is. Then we can talk.
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Thursday, June 4th, 2009 AT 7:15 PM

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