1 K100RS 16V - disconnect engine temp sensor? Sun Apr 16, 2017 1:56 pm
Moe Matrix
active member
Is there a way to disable the engine temp sensor, to prevent it from raising the idle, or is engine temp sensor required for startup?
Thanks.
Thanks.
Moe Matrix wrote:Is there a way to disable the engine temp sensor,
Moe Matrix wrote:I have the brass screws down all the way,
Moe Matrix wrote:do I understand correctly, the engine temp sensor is what is responsible for leaning the intake. the water temp sensor is to trigger the fan. two different mechanisms?
There is a trouble shooting page linked off the Portal tab. Have a read thru that and you probably have a better idea about how the 'system' works. The suggestions made above are good. Start by looking for air leaks such as injector kit (easy and cheap), Throttle Body (TB) rubbers (not so easy), crankcase breather (easy), engine cover seals and grommets (easy). These are all rubber parts.Moe Matrix wrote:so the engine temp sensor is the same as the water temp sensor?
The temperature sensor contains 2 thermistors which are both earthed thru the body of the sensor to the engine block. Of the two connections on the connector of the sensor, one goes to the temp control unit which controls the fan on or off. The other goes to the FICU (Fuel Injection Control Unit) which controls the mixture at start up when cold. About the only thing it will do is richen the mixture initially to get her started and then adjust the rich mix down to the point she's all warmed up. It will also signal the FICU in the event that the engine has over heated. The FICU responds by preventing the engine from restarting once the engine has stopped, untill it has cooled down to operating temps.
The sensor can be checked with a DMM to ensure the signal is within the specified operating range.
what about the air intake sensor?
The MAF flap only measures the volume of air passing thru the intake. The air intake temp sensor simply adjusts the signal from the MAF to the FICU so it can determine the 'mass' of air which is needed so as to mix the correct 'mass' of fuel. This is because the volume of air changes greatly as nominal temps vary eg between a cold day of 10ºc and a stinking hot day of 42ºc
one of them adjusts the idle and i really don't think it's necessary.
None of the temp sensors have anything to do with the idle. And the FICU does not 'lean' the fuel mix. About the only thing that will lean the mix is if you have an air leak or system parts have been changed with non-spec parts.
i would rather it did nothing. if i want more air intake, then adjust the brass screws, but why adjust them if the computer is constantly messing with the intake levels??? that's why i have it bottomed out, because it's constantly adjusting them anyway, so whatever i adjust it to, 1.5 counter-clockwise, or whatever, it will still adjust it to the way the computer wants it, based on outside temp.
as stated, after it warms up, the tach will rise from 975 to about 1200, then goes back down to 975. I can hear when it starts to lean the mixture and rise the rmps. I do not want that, and wonder if it is really necessary for the computer to constantly change intake settings, whether i have screwed with the brass or not.
is there a way to get it to stay at 975 no matter what the outside temp is? is there a way to disengage the air intake sensor to stop the computer from altering the mix every time the outside temps drop one degree?
I do no appreciate this particular function of the bike, or EFI, or whatever the problem is. I do not want a computer to overthink what it's supposed to do. I do not happen to believe this function of air intake sensor to raise/rix mixture is necessary at all, and i would like it disabled.
that is all.
I think you have made the assumption that BMW know sh!t about fuel induction. Many people have a problem understanding how fuel injection works especially on a K-Bike.
Could be your MAF is Kaput and its sending a varied signal to the FICU. Maybe the temp sensor in the MAF is dud.....the weather here changes every five minutes, and the slightest temp drop outside will make it run leaner, and higher. it takes a long time for it to warm up in cold weather.
1989 K100RT VIN 0097367 (naked) 1996 K1100RS VIN 0451808 | Fuel: 95 Octane Engine Oil: Nulon Full Synthetic 15W50 Gear Box Oil: Nulon Synthetic 75W90 |
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