 OT: 1992 325i, Not passing smog |
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| jeffdon |
 May 11 2011, 02:36 PM
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Senior Member  Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None  |
Any BMW experts out there? Just flunked smog with Hi HC and NO at 15mph. I was ok at 25. I have replaced a cracked duct between the AF sensor and throttle body. I think I am also going to change the plugs and oil (been awhile). I replaced the O2 sensor two years ago. Anything else i should be doing?
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| Andyrew |
May 11 2011, 05:33 PM
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Spooling.... Please wait Group: Members Posts: 13,376 Joined: 20-January 03 From: Riverbank, Ca Member No.: 172 Region Association: Northern California 
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What were the exact numbers.
If your close, change oil and plugs and run 1 part Toutline (Tutoul, its a paint thinner/alcohol, It helps eliminate nocking) to 5 parts gas. Is your cat old? You should run the engine HARD (High RPM's) to heat up the cat very hot JUST before going on the dyno, which will help it burn the HC's. |
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| jeffdon |
May 12 2011, 08:18 AM
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Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None |
QUOTE(Andyrew @ May 11 2011, 04:33 PM)  What were the exact numbers. If your close, change oil and plugs and run 1 part Toutline (Tutoul, its a paint thinner/alcohol, It helps eliminate nocking) to 5 parts gas. Is your cat old? You should run the engine HARD (High RPM's) to heat up the cat very hot JUST before going on the dyno, which will help it burn the HC's. Going to do all that, and yeah, the cat is original. Someone also told me to run it down to a few gallons of gas, dump a gallon of alcohol in it, test it, then top off with gas to dilute the alky. Hmmmm. Speaking of plugs, any thoughts on platinum vs non-plat on these things? |
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| Coldswede |
May 12 2011, 08:55 AM
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#4
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Newbie Group: Members Posts: 31 Joined: 11-March 11 From: Gainesville, Florida Member No.: 12,817 Region Association: South East States |
QUOTE(jeffdon @ May 12 2011, 10:18 AM) QUOTE(Andyrew @ May 11 2011, 04:33 PM) What were the exact numbers. If your close, change oil and plugs and run 1 part Toutline (Tutoul, its a paint thinner/alcohol, It helps eliminate nocking) to 5 parts gas. Is your cat old? You should run the engine HARD (High RPM's) to heat up the cat very hot JUST before going on the dyno, which will help it burn the HC's. Going to do all that, and yeah, the cat is original. Someone also told me to run it down to a few gallons of gas, dump a gallon of alcohol in it, test it, then top off with gas to dilute the alky. Hmmmm. Speaking of plugs, any thoughts on platinum vs non-plat on these things? Don't use platinum plugs on older BMW's. Be sure to check carefully for another vacuum leak. Give it an Italian Tune Up. The suggestion to go in with a hot cat is great. Be sure your 02 sensor is functioning perfectly. It is usually the little basic things that fail you. |
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