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#1 (permalink) Old 01-21-2005, 11:55 AM
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Hi

I have a 325i 2004.

I noticed the following in the cold weather this week regarding the tachometer and LCD panel.

Once I started the car, the tachometer was oscillating between the 0.5 and 1 mark (rpm). The oscillation was quite obvious and kept going on each subsequent stop. After 10 mins, it stopped oscillating on a stop, but i noticed that on each stop, it will stay at the 0.75 rpm mark and not go down to 0. (I did not take note whether it actually went to 0 in hotter weather, or if it is actually meant to go all the way down to 0 on a stop).

On a more minor note, I also noticed that after i start the car and while it's heating up, the LCD panel (showing radio info FM/AM etc) does not display properly. For example, some of the lights in the LCD disappear. They do re-appear once the car is heated. Would that be a defective LCD that needs to be replaced or that would be normal behavior even for a new car?

Would be grateful if anyone had an explanation for these.

Thanks
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#2 (permalink) Old 01-22-2005, 01:26 AM
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for one... that's really 750rpm, not .75 and 1 would be 1000rpm

next, i'm sure it's the same for the '04 models, you don't have to sit and wait for the car to warm up. If you read your user manual, it should say, drive immediatly after starting. The engine will warmup just don't romp on the gas too much.

Now for the oscillation, this used to happen in my 328i (E46). The rpm's would jiggle, after ignoring it, would drop really low to just above stall. In fact, it would jump up rather sharply and move the car a bit. Now, this had begun to occure as the temps really got low.. and i mean LOW. Had the dealer reinstall the factory programing in the computer, just like a reset, and it hasn't happened yet. On this forum, I've read that it could be a VANOS malfunction, which is rather costly to fix. But, beyond what I've stated, I have no idea what it could really be. Just note that the rpm's would be normally higher in the cold weather (i'm assuming to aid in the warm up of the engine when at stop lights and such).

Never had that happen to my LCD panel. Could be just the cold, but I'm not an expert.

I hope that I've answered some of your questions.

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#3 (permalink) Old 01-22-2005, 01:29 AM
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#4 (permalink) Old 01-24-2005, 11:44 AM
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Thanks Dough,

your answers are very helpful. I will go have a check at the dealership to see what their take is on this. Hopefully if it is a VANOS malfunction, i should be still covered under the warranty.
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#5 (permalink) Old 01-24-2005, 07:18 PM
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so someone explain to why you think this is vanos??? sounds like nothing to me....,

and the double injector pulse stops about 5 seconds after you start the car, so do not expect high idle when cold.

they have a service bulletin on the lcd, it fails in cold weather. replacement of the entire unit, no ?? asked. this happened also to my car (but the radio panel).
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