1 Cold start!!! Mon Oct 18, 2021 2:05 pm
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Hi
My K100rt 84 has hard cold start any advice?
Thank you
My K100rt 84 has hard cold start any advice?
Thank you
1989 K100RT VIN 0097367 (naked) 1996 K1100RS VIN 0451808 | Fuel: 95 Octane Engine Oil: Nulon Full Synthetic 15W50 Gear Box Oil: Nulon Synthetic 75W90 |
What is the first temperature sensor, Martin, the air temperature sensor in the air flow meter?martin_the_last wrote:I think there must be a secound temperatur sensor on the block of the engine that gives signal to the ECU regading motor temoeratur condition. So far we could not find it. Before we tear down the bike I want to know if one can tell me where to find this secound sensor.
Hi point-seven-five, Thanks. Correct - it is an 8V version. I will check the Ohms as you said. Thanks a lot. And I will also checkt the z tube. Good idea. I havnt thought about that so far but is in fact a source failure very often. Thanks. I will check.Point-Seven-five wrote:Assuming your friend's bike is an 8 valve model with a Jetronic engine control unit, disconnect the big connector under the seat and check the resistance between pins #10 and #13. When the engine is cold you should see around 2500 ohms. As the engine comes up to operating temperature the resistance should drop to about 250 ohms.
That 2500 ohms tells the Jetronic to make a richer mixture for starting.
It is also possible that the crankcase breather known as the Z tube may be cracked and creating an air leak that makes the mixture too lean. Look for the cracks near the hose clamps that hold it in place. That tube is a known source of trouble.
That's the coolant temperature sensor to which I referred, Martin.martin_the_last wrote:This enrichment systems normal work for 5 to 10 secounds after a cold start or longer? And this sensor for the enrichment is the one I have meant.
Hi point seven five, with 8° C the Ohms between 10-13 is around 1950 Ohms. Sounds okay in my opinion. The Z tube was changed already from him. But we will take a look again to all air leading tubes and stuff behind the air flow meter.Point-Seven-five wrote:Assuming your friend's bike is an 8 valve model with a Jetronic engine control unit, disconnect the big connector under the seat and check the resistance between pins #10 and #13. When the engine is cold you should see around 2500 ohms. As the engine comes up to operating temperature the resistance should drop to about 250 ohms.
That 2500 ohms tells the Jetronic to make a richer mixture for starting.
It is also possible that the crankcase breather known as the Z tube may be cracked and creating an air leak that makes the mixture too lean. Look for the cracks near the hose clamps that hold it in place. That tube is a known source of trouble.
Okay, do you know which sensor it is that leads to the pins 10 and 13? Do you konw which one it is and where to find it on the motor? Maybe we will just change it if it is not too expensive.Point-Seven-five wrote:At 8C the resistance should be quite a bit more than 2500 ohms. I'm not sure this is your problem, but it's something to keep in the back of your mind as you work on the other tests.
Hi, thanks also for your answer. But can you also tell my which sensor exactly yo mean? So far we have found a few sensors and so far from half of we know what they are. But from still not So can you explain which sensor you mean and where it is mounted. Thanks.MartinW wrote:The temperature sensor should go in clean and bare, any thread tape, sealant or corrosion can interfere with it's function. It relies on the seal/gasket to prevent leaking.
Regards Martin the Ozinian.
Hi again,Laitch wrote:That's the coolant temperature sensor to which I referred, Martin.martin_the_last wrote:This enrichment systems normal work for 5 to 10 secounds after a cold start or longer? And this sensor for the enrichment is the one I have meant.
The coolant temperature sensor isn't in the radiator; it's in a pipe screwed into the block connecting the coolant in the radiator to engine block cooling passages by means of a hose from the radiator. It's measuring the temperature of the coolant before, and after, the thermostat opens. Its responding to the temperature of water in the block. As the water warms, its signal to the Jetronic changes and the fuel mixture becomes more lean. All this is happening before the thermostat opens.
Here's a chart from a compelling literary work titled Level 2: LE Jetronic. It describes our 2V( also known as 8V) Brick engine management system. The author seems to be BMW but there is suspicion it was ghost-written by Bosch, the manufacturer. Some readers might find it boring, others might find it mysterious. Anyway, the chart shows the engagement of the various electronic engine management's components at each stage from ignition through warmup. Each X in the chart indicates the engagement of a particular component during a stage of warmup. The pressing of the starter button starts enrichment but the coolant temperature sensor is the major player until the engine is warmed up. Note the time intervals in the chart.
My first response to your query suggested only that this sensor is a possible source of your current trouble and that there is more left to learn concerning it. When you measure at pin #10—as Point-Seven-Five suggested, you are measuring the coolant temperature sensor's input contributing to fuel mixture control.
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