I Need Help!!!

[Dickiebird]

Air intake sensor!!!........I think? @tu*

No fault codes and I did test it with a multimeter and it seemed in spec, but yesterday whilst checking all of the harness and connections I disconnected the sensor and started her up, she idled straight away a lot better than before, I did have her running for a few minutes before this so needed to try her again from dead cold, which I have just done and she seems to idle well and seems a lot smoother to rev....so fingers crossed!
So I now need to buy a air intake sensor, had a look on David Silver and they are ?64!!!! Jesus!!
May see if I can pick a used one up on eBay.

Thanks to everyone for advice, suggestions, testing and sending me bits to try @tu* let's hope it's sorted.

Whereabouts is the intake sensor situated, Howard ? Might try that myself and see if it makes any difference to my bike. @tu*

 

[Howard]

On the left of the airbox, in fact the only sensor on the airbox, 2 screws to undo, white in colour, hopefully that's the bugger causing the problem.

 

[mikeyw64]

Air intake sensor!!!........I think? @tu*

No fault codes and I did test it with a multimeter and it seemed in spec, but yesterday whilst checking all of the harness and connections I disconnected the sensor and started her up, she idled straight away a lot better than before, I did have her running for a few minutes before this so needed to try her again from dead cold, which I have just done and she seems to idle well and seems a lot smoother to rev....so fingers crossed!
So I now need to buy a air intake sensor, had a look on David Silver and they are ?64!!!! Jesus!!
May see if I can pick a used one up on eBay.

Thanks to everyone for advice, suggestions, testing and sending me bits to try @tu* let's hope it's sorted.

If it works fine with it removed there's always the cowboy approach.

Put a switch in line and disable it until the bikes warmed up ;o)

 

[Dickiebird]

There's two on the Bay of Fleas right now , Howard. One for 14 quid and one from the U.S.of A for about 35 quid ( inc. postage) Both s/hand, though.:dunno:

 

[Howard]

If it works fine with it removed there's always the cowboy approach.

Put a switch in line and disable it until the bikes warmed up ;o)

The only thing is that the sensor monitors the air temp which changes depending how fast you and the bike are going, so it works (or is supposed to ) all of the time, that's also maybe why I thought she was running a bit sluggish.

 

[mikeyw64]

The only thing is that the sensor monitors the air temp which changes depending how fast you and the bike are going, so it works (or is supposed to ) all of the time, that's also maybe why I thought she was running a bit sluggish.

Yes & no.

Its not entirely dependent on speed, I would have thought ambient air temp would be as/more relevant.


Ok admittedly I did some Googling as I'm no expert (& this is generic) and I'm also just thinking out loud so bear with me here

The colder and therefore more dense the air the more fuel has to be injected to maintain the correct ratio.

You could be on to something though given how much you have already eliminated

If the intake air temperature sensor is not reading accurately, the PCM may think the air is warmer or colder than it actually is, causing it to miscalculate the air/fuel mixture. The result may be a lean or rich fuel mixture that causes driveability symptoms such as poor idle quality when cold, stumble on cold acceleration, and surging when the engine is warm.



Also might be worth cleaning it off first

An air temperature sensor can sometimes be damaged by

backfiring in the intake manifold. Carbon and oil contamination inside the intake manifold can also coat the tip of the sensor, making it less responsive to sudden changes in air temperature. The air temperature sensor itself may also degrade as a result of heat or old age, causing it to respond more slowly or not at all.

Sensor problems can also be caused by poor electrical connections at the sensor. A loose or corroded wiring connector can affect the sensor�s output, as can damaged wiring in the circuit between the sensor and PCM.

 

[Howard]

Yes & no.

Its not entirely dependent on speed, I would have thought ambient air temp would be as/more relevant.


Ok admittedly I did some Googling as I'm no expert (& this is generic) and I'm also just thinking out loud so bear with me here

The colder and therefore more dense the air the more fuel has to be injected to maintain the correct ratio.

You could be on to something though given how much you have already eliminated

If the intake air temperature sensor is not reading accurately, the PCM may think the air is warmer or colder than it actually is, causing it to miscalculate the air/fuel mixture. The result may be a lean or rich fuel mixture that causes driveability symptoms such as poor idle quality when cold, stumble on cold acceleration, and surging when the engine is warm.

If the engine computer uses the air temperature sensor input to turn on a cold start injector, and the sensor is not reading accurately, it may prevent the cold start injector from working causing a hard cold start condition


Also:

An air temperature sensor can sometimes be damaged by

backfiring in the intake manifold. Carbon and oil contamination inside the intake manifold can also coat the tip of the sensor, making it less responsive to sudden changes in air temperature. The air temperature sensor itself may also degrade as a result of heat or old age, causing it to respond more slowly or not at all.

Sensor problems can also be caused by poor electrical connections at the sensor. A loose or corroded wiring connector can affect the sensor�s output, as can damaged wiring in the circuit between the sensor and PCM.

Yes to that man @tu*@tu*

I too read up on it :-0)

It can't be the wiring as things change when I disconnect the sensor, the sensor is in the airbox, not the manifold so it will be less prone to heat damage. I think it was causing over fuelling when cold as it smelled rich and if I stopped the engine before it had warmed up it was getting flooded, hence my problems with wet plugs.

 

[57grant]

Reflecting on this just confirms my preference for simple unsophisticated carbed birds!

Grant