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1

I will preface this by saying I do not have a lock on BMW's, especially older ones, so take this for what it's worth. If this were an American car with mid 90's fuel injection, I'd say your Mass Air Flow (MAF) sensor was bad. Since it's a BMW and it appears they didn't use a MAF, I'd point to the air flow meter. Here is my thinking. I'm going to make an ...


1

You need to have your vehicle scanned for any basic faults. If the problem is intermittant as described, then use a data logger such as Launch CRecorder or iOBD2, to track the vehicle operation and show up any intermmittant fault. A lot of scanners will also record the engine operation to enable you to scutinise the record for faults.


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I am pretty sure this is a wire problem. Open the door and check the cable between door and middle pillar. If everything is fine, check the door lock engine. For example replace it between the right and the left door. If the engine is also fine, I would just bridge the wires with some other door.


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Thanks for the replies, turned out I needed a new lambda sensor!


3

The general "rule of thumb" for horsepower ratings between crank HP (CHP) and rear-wheel HP (RWHP) is ~18-20%. An automatic transmission will be closer to 20%, while a manual transmission around 18%. As you stated, and for the same reasons, these are just a general guideline. If you have the CHP number available, multiply that number by .8. (ie: 450hp x 0.8 ...


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There's another factor regarding humidity which is that water air expands/collapses per degree of temperature change a hugely, so its presence in the combustion chamber increases the pressure of the explosion. A friend of mine experimented with a water injection system on his (carburettor) car while studying for an engineering degree. He reported better ...


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tl;dr: Cold dry air has a substantial effect on horsepower. This can be confirmed through experimentation on any modern car. I can think of two scientific reasons as to why this may be: Increased air density Decreased humidity Yes and yes. You're already most of the way there. Let's take a quick trip to simplified theoretical model ...


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You are absolutely right. I remember a few years ago a Formula 1 commentator mentioned that the cold conditions in the morning is why the drivers were seeing their lap times had improved by as much as 1 second, which is a lot in Formula 1. Also, an intercooler cools air down to make it more dense, which in turn makes more power, so obviously your theory is ...



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