Question about Nissan Z
Change your oxygen sensors - they're responsible for feedback that the computer uses to determine the air/fuel mixture. They usually are good for about 60k miles and then start to go downhill. When they get to a point that the computer won't trust them, it ignores them and runs on preprogrammed fuel maps that run excessively rich (too much fuel) to safeguard the engine. You've probably seen a decrease in fuel mileage as well. And the O2 sensors have to be up around 900 degrees before they'll work - the car ignores them until then. That's why you run fine after a cold start but run rough once the car is warmed up.
The O2 sensors you want to change are in the exhaust system between the engine and catalytic converters (the "pre-cat" sensors). There are O2 sensors after the cats as well, but those are used comparatively to determine how well the cats are functioning. The primaries are the ones used for fuel mixture. If it's been this way for a few weeks or so, I'd put new spark plugs in as well - rich fuel conditions can foul them and contribute to the rough running.
Posted on Dec 09, 2009
SOURCE: Eml and diagnostic problems
As for the limp mode unless you have an expensive diagnostic system this usually has to be done by BMW (anything to get ya to a dealership!!). The comms problem, is the key turned in the ignition?
Posted on Apr 27, 2009
Did this start happening, after tyres were rotated, or a new tyre was fitted? This will probably reset when the ignition is turned off and back on again, then start flashing after another 80km. This can be caused by the rolling diameter of the wheels being different, and the computer is picking up that a tyre is flat, or that the tyres are of different size designation or different levels of wear. This happened to me after rotating tyres, and would repeat every 40-50km, and went away, when i put the spare, back to being the spare.
Posted on Apr 11, 2010
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