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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 03-15-2015, 12:09 PM
chris1986c chris1986c is offline
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Service engine soon light

I have a 1999 bmw 528i that the service engine light came on it was put on a computer and the codes are p0170, p0173, p1188, p1189. The car can run find then start it again and it idles from like 800 to 500 back and fourth and chugs when getting to 50. It can come out of this problem sometimes while driving. Does anyone have any ideas what it may be? I have already used mass air flow sensor cleaner on the maf. I'm going to try to clean it one more time. Car only has 159,333 miles
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  #2  
Old 03-15-2015, 12:53 PM
u.nanimous u.nanimous is offline
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Mein Auto: 1999 740i
I'd start with smoke testing it for intake leaks. And just to cover some extra bases, how's your fuel filter and fuel pressure?
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  #3  
Old 03-15-2015, 01:20 PM
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bluebee bluebee is offline
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Location: San Jose, California
 
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Mein Auto: 02 BMW 525i M54 auto 130K
Smoke test is the way to go, no doubt about it.

Without a smoke test, you need a visual look at EVERY rubber "hose" in the engine bay, paying attention to the problematic ones listed in the thread below.

- How to diagnose a BMW E39 engine misfire (1)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #4  
Old 03-15-2015, 06:12 PM
chris1986c chris1986c is offline
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Fuel trim sensor 1,2 and fuel trim bank 1,2 them r the codes
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  #5  
Old 03-15-2015, 08:35 PM
MKJS MKJS is offline
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Quote:
Originally Posted by chris1986c View Post
Fuel trim sensor 1,2 and fuel trim bank 1,2 them r the codes
Chris, people are telling you that you very likely have vacuum leak(s). Now, I don't know much about fuel trim, but I do know if these people think you need a smoke test, I'd get a smoke test.

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(9/98 production) '99 540i
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  #6  
Old 03-15-2015, 11:23 PM
chris1986c chris1986c is offline
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Funny thing is the light went off today
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  #7  
Old 03-16-2015, 06:47 AM
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bluebee bluebee is offline
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Originally Posted by chris1986c View Post
Funny thing is the light went off today
Check the pending codes...because it might come back:
- Cheapest CAN OBDII scanner on the net that reads DTCs, pending codes, & clears codes
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #8  
Old 03-16-2015, 07:31 AM
AH673000 AH673000 is offline
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Location: Delaware
 
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Mein Auto: 1997 BMW 528i
Quote:
Originally Posted by chris1986c View Post
I have a 1999 bmw 528i that the service engine light came on it was put on a computer and the codes are p0170, p0173, p1188, p1189. The car can run find then start it again and it idles from like 800 to 500 back and fourth and chugs when getting to 50. It can come out of this problem sometimes while driving. Does anyone have any ideas what it may be? I have already used mass air flow sensor cleaner on the maf. I'm going to try to clean it one more time. Car only has 159,333 miles

Could be a fuel pump going bad....easy enough check at the fuel rail with a pressure gage.....look for 50 plus ponds per square inch.
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