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In Reply to: Excessive Gas consumption at idle 735il -longish posted by Mannyk on November 25, 2001 at 23:50:02:
You've mentioned sorting everything but the O2 sensor - you have checked this, right? If not, that's the very next thing to check - when the negine is warm, it is the final link in the "closed loop" mixture control, taking over from the airflow meter (which only controls until the o2 sensor reaches operating temperature). Without it the engine will default to using the AFM, which isn't as accurate or responsive.
BTW, you're right - 11mpg is not good, but saying that I usually have to use cruise control at 50kmh to get above 16-17 (on the econometer guage). Good driving gets abt 21 on good days.
Hope this helps & Auckland weather is better - how's your baby (if I'm remembering the right guy?!)
Max
Hi all,
I've asked this before, but did not get the range of answers I had hoped for.
Using the enhanced function "test 3" on OBC when car is idling I get 2.5 - 2.7 litres an hour consumption in idle. If in drive, it goes up to 3.1, and with aircon, it is 3.8. This is more thirsty than my friends 5 litre modified v8.
The reason I am asking is that my 7 does 11 mpg around town no matter how gently I drive and it is driving me nuts. It runs normally, no bad idle, revs out to redline no probs and is smooth in between.
On a trip, it used to do 28 mpg at steady 80mph (130km/h), but now does 21-23 at steady 60 mph (100 km/h).
Have cleaned out airflow meter, checked correct voltages at
airflow meter, idle cotrol valve, temp sensor, run injector cleaner through, replaced plugs, rotor and dizi cap, adjusted valves, flushed fluid in Tranny and new oil in diff.
One thing I did find is that if I introduce a vaccuum leak ( by pulling the dipstick), the litres per hour drops to 2.4 litres per hour with no acceroies and in neutral, but idle becomes rough.
Any thoughts?
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