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By the way, would a faulty gas filler cap or vacuum leak cause the O2 monitor not ready? |
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2. Customer drive cycle means - "C" A customer's drive cycle is what they may do under their normal daily driving route. This route or "cycle" may not create the conditions for all monitors to be tested...thus the FTP (federal test protocol) has its defined "FTP drive cycle" where all of the monitors should be tested within its defined criteria.You'll discover reading through many threads on this topic where owners will mention that they drove for hours or over 100 miles etc and the monitors still aren't ready. And when you consider the last test (idle for 5 minutes IN GEAR)...how many examples of daily driving does that occur...unless you are stopped at a railroad crossing or REALLY long light? This is an example of a "customer's drive cycle" versus the "FTP drive cycle". The FTP drive cycle can be completed in approx 30 minutes of driving if there aren't any other underlying issues. |
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It seems like FTP can only be done reliably by a shop on a dyno? I don't live somewhere that allows me to perform the specified drive cycle in one swoop. A service consultant at a local BMW service center told me that it does not have to be done continuously nor in the specified order. I've been trying different variations with no success. This is my realistic version of the FTP drive cycle...
There are some questions that came to mind while going through the drive cycles...
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To be clear, the drive cycle is designed to allow you to immediately test the car as quickly as possible.
Each segment of the drive cycle does not have to be connected, and you can do it separately. It's also really important to have an OBD scanner to show you *which* I/M monitors are not ready. Do NOT use cruise control. CC can use too large throttle inputs. It's better to let the speed drop than use more throttle. I've found that setting the readiness monitors is very hard for people who have an abrupt driving style. My wife is never able to drive cycle her 993TT (notoriously difficult emissions cars), but I can do it consistently. I have also found that driving at the LOWER end of the speed range works better for me. All that said, if you can't set the readiness monitors with 3,000 miles of driving, you need to consider whether or not you have an issue that's preventing that. Knowing what monitors aren't setting would help. Edit: I'm sorry, I missed the monitor readout earlier. Have you considered replacing the O2 sensors? |
Thanks for the info...especially not to use cruise control and stay at the lower end of the range...will try.
The O2 monitor and EVAP monitor are not ready. SMOG shop said they can let EVAP slide but O2 is needed. I also suspect something is preventing the O2 monitor to set. I asked four different shops (including one dealership) and they all said nothing they can do when there's no check engine light. |
Turns out it was a loose O2 sensor. Thank you all for helping!
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Low voltage was a clue. Nice work tracking it down. Good luck! Mine is due for emissions checks in the next three months. Mine has to pass before the end of January for registration. |
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