Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > BMW Forums > BMW Technical Forums > BMW 5-Series E28/E34/E39/E60/F10/GT


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Feb 2011
Posts: 2
Garage
BMW Roundel California Smog Check Fail

I am the proud owner of a manual 525i 1993 with 222000 miles. Recently I moved to California. I took my car for a smog inspection and it failed. There are 3 tests that take place at 15 and 25 mph: Hydrocarbon ppm, NOx, and CO. I passed NOx and CO no problem, but I failed the Hydrocarbon (HC) ppm at 15 mph severely and barely failed at 25 mph. At 15 mph (2nd gear) the limit is 83 HC ppm; I got about 220 HC ppm. At 25 mph (3rd gear) the limit is 50; I got about 54 HC ppm.

About a year ago, I replaced the O2 sensor after receiving that fault code,rebuilt the VANOS, and replace the spark plugs. The car has the stock computer chip and only sees mobil 1, everything that has been replaced is a Pelican part product or OEM and still has great performance overall (30 mpg highway!). To me it sounds like an issue in the fuel injection system (running too rich). I believe the cat, though it may be old is still doing it's job.

Can anyone please confirm or advise on my current situation?

Old 02-06-2011, 12:51 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
SharkHead
 
JhwShark's Avatar
 
Join Date: Oct 2009
Location: Pacific Northwest
Posts: 1,027
Garage
Please post all results for both speeds:
HC
CO
NO

Good NO and CO means that you most likely have an OK cat and O2 sensor with A/F also probably OK.
Also, and more to your issue...high mileage cars can have issues getting a full burn. Using lowest octane in CA is best for smog tests. Since you have modest HC fail you are most likely not burning all the fuel. Low Octane has a flash point that will burn off more/most of your fuel during the engine cycle while higher octane may not burn completely in time...leaving some residual HC for the tester.

Drive the car for a good bit of time before the test as well.
__________________
'79 928, 85k Opal Metallic
'99 BMW 540i, 97k Titanium
'72 BMW 3.0 csi, 85k km (euro Deutschland '82) Taiga
Old 02-07-2011, 10:58 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Mar 2011
Posts: 2
I have a 1994 740il with 208k miles that just failed CA smog. Passed all tests except HC (PPM) at 15 MPH. My reading was a 72 and Max allowed is 56. I am thinking new plugs, oil change and getting engine nice and warm prior to test will help...any ideas? (

My Test Numbers
15MPH %CO2 - 15.2, %O2 - 0.0, HC (PPM) - 72 (MAX 56), CO% -.12, NO (PPM) - 117
25MPH %CO2 - 15.1, %O2 - 0.0, HC (PPM) - 25 (MAX 45), [/B]CO% -.08, NO (PPM) - 45
Old 03-04-2011, 01:53 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
SharkHead
 
JhwShark's Avatar
 
Join Date: Oct 2009
Location: Pacific Northwest
Posts: 1,027
Garage
Since all Pass except for the HC at low rpm's...
Yes, change oil, plugs may be OK but change can't hurt, and always get car to operating temp for some time before pulling into the SMOG check.

Also, on old cars, rings are worn a bit...so use low octane. It has a low flash point in comparison to higher grades. This means that you will burn more if not all the fuel in the combustion chamber, higher octane burns hotter but takes longer to burn all the fuel...so the logic is you burn it instead of un-burnt going down/out the exhaust. This is what I did when I missed the last test.
__________________
'79 928, 85k Opal Metallic
'99 BMW 540i, 97k Titanium
'72 BMW 3.0 csi, 85k km (euro Deutschland '82) Taiga
Old 03-04-2011, 03:20 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
Join Date: Mar 2011
Posts: 2
Just wanted to say thanks for the advice....I changes the plugs and Oil, then ran all the gas out (had fuel injector cleaner in it), then put lower octane gas in, and made sure the CAT was nice and hot before testing....passed with flying colors.

Thanks Again
Old 03-09-2011, 02:14 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered User
 
Join Date: May 2011
Posts: 3
what do you mean by a lower OCTANE? I know it is 87, 89, 91. Can you use an 87Octane on a bimmer?
Old 05-05-2011, 11:49 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
SharkHead
 
JhwShark's Avatar
 
Join Date: Oct 2009
Location: Pacific Northwest
Posts: 1,027
Garage
Quote:
Originally Posted by ppjonydi View Post
what do you mean by a lower OCTANE? I know it is 87, 89, 91. Can you use an 87Octane on a bimmer?
Sure. It cost less and most important for a SMOG test...it helps you pass in certain cases! It may cause you to ping if you have a higher compression engine, but for passing a SMOG test why not. Then you can use what ever suits your car and drive style...
__________________
'79 928, 85k Opal Metallic
'99 BMW 540i, 97k Titanium
'72 BMW 3.0 csi, 85k km (euro Deutschland '82) Taiga
Old 05-06-2011, 09:41 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
In the shop at Pelican
 
Jared at Pelican Parts's Avatar
 
Join Date: Aug 2002
Location: Los Angeles, CA
Posts: 10,461
Higher octane gas actually burns SLOWER.

1990's BMWs will run fine on 87 octane. They have knock sensors.

And yes, probably a good idea to use it to try and pass smog.
Old 05-06-2011, 09:46 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered User
 
Join Date: May 2011
Posts: 3
Thanks much for the info, Another thing, how about the type of oil needed for 1993 525i, which have a higher mileage( 297xxx) miles?
Old 05-09-2011, 01:45 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
In the shop at Pelican
 
Jared at Pelican Parts's Avatar
 
Join Date: Aug 2002
Location: Los Angeles, CA
Posts: 10,461
I would just run whatever oil you have always run. Don't use any of that high mileage crap.
Old 05-09-2011, 01:47 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Registered User
 
Join Date: May 2011
Posts: 3
Hi, I know there are different types of spark plug for 1993 525i BMW. Does anybody know what is the measured resistance for BOSCH 4417 tip to tip? I normally measured them before installation to eliminate headaches. I'm used with NGK plugs, but this 4417 I obtained, when measured give different readings. 3 of them have 4K, 1 with 10K, and the other 2 have no resistance at all. I will appreciate your help. Thanks.
Old 05-21-2011, 07:04 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
In the shop at Pelican
 
Jared at Pelican Parts's Avatar
 
Join Date: Aug 2002
Location: Los Angeles, CA
Posts: 10,461
Quote:
Originally Posted by ppjonydi View Post
Hi, I know there are different types of spark plug for 1993 525i BMW. Does anybody know what is the measured resistance for BOSCH 4417 tip to tip? I normally measured them before installation to eliminate headaches. I'm used with NGK plugs, but this 4417 I obtained, when measured give different readings. 3 of them have 4K, 1 with 10K, and the other 2 have no resistance at all. I will appreciate your help. Thanks.
4417 are Platinum plugs. You don't want to use those in your engine. Use Bosch FR-7-LDC+
Old 05-23-2011, 08:35 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
 
SharkHead
 
JhwShark's Avatar
 
Join Date: Oct 2009
Location: Pacific Northwest
Posts: 1,027
Garage
Quote:
Originally Posted by jared at pelican parts View Post
4417 are platinum plugs. You don't want to use those in your engine. Use bosch fr-7-ldc+
+1...

__________________
'79 928, 85k Opal Metallic
'99 BMW 540i, 97k Titanium
'72 BMW 3.0 csi, 85k km (euro Deutschland '82) Taiga
Old 05-23-2011, 11:46 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #13 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 

Tags
california , emissions , fuel injection , smog check


All times are GMT -8. The time now is 12:02 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2020 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.