Engine temperature sensor

pericep · 03-03-2009, 12:58 PM

Managed to improve running/pinging substantially, by changing spark plugs and adjusting Motronic system (BMW dealer said the bike was meant to ping like that .....!).

However diagnostics indicate engine temperature probe is indicating a lower temperature on left cylinder at idle (?).
Does this seem likely ? Would if therefore affect the left cylinder's running by overcompensating and adding more fuel ?
Where is the engine temperature probe/sensor situated ?

SergioK · 03-03-2009, 01:19 PM

Quote:

Originally Posted by pericep

...adjusting Motronic system.

What adjustment is there on the R1100S??? Don't tell me they disconnected the battery, reconnected it and then reset by opening the throttle to full extension three times.

pericep · 03-03-2009, 01:42 PM

No............(this is where I start to have nightmares....) they adjusted "something" on the Motronic. Don't tell me it can't be adjusted ! They did change the plugs (I was there) so maybe that is all the change......

roger albert · 03-03-2009, 02:00 PM

TPS is about it (along with cables and stops, but those latter ones are not strictly speaking motronic)

SergioK · 03-03-2009, 02:13 PM

Having to adjust the TPS is quite odd on a 'relatively' newer bike. The TPS on my '01 was in the orignal place and I made a very minute adjustment on it even though it was still in spec. I can't recall but it was either in the lower or high range so I put it smack in the middle. And that was when it was about 6+ years old and had 70k+ miles on it.

This is the first I'm hearing of jug temp sensors.

roger albert · 03-03-2009, 02:42 PM

are we talking 11s or 12s here?

SergioK · 03-03-2009, 02:59 PM

He has a 2003 BCR.

roger albert · 03-03-2009, 03:10 PM

This dealer is either flaky, or knows of secret sensors.

SergioK · 03-03-2009, 03:33 PM

Quote:

Originally Posted by roger albert

This dealer is either flaky, or knows of secret sensors.

Don't you mean $ecret $ensor$?

Peter Parts · 06:24 AM

Quote:

Originally Posted by pericep

Managed to improve running/pinging substantially, by changing spark plugs and adjusting Motronic system (BMW dealer said the bike was meant to ping like that .....!).

However diagnostics indicate engine temperature probe is indicating a lower temperature on left cylinder at idle (?).
Does this seem likely ? Would if therefore affect the left cylinder's running by overcompensating and adding more fuel ?
Where is the engine temperature probe/sensor situated ?

Perhaps you heard "the temperature probe is on the left side," not that it is reading the left cylinder. Few shops are inclined to test a temperature probe except by substitution and the trim factor on the engine temperature probe is minor unless it has gone open-circuit - see the FRK thread for some laughs. I could (easily) be mistaken, but I think the resistance values of the air and engine sensors are similar.

For sure, you don't want pinging and should make things right. There are a whole bunch of adjustments for the ECU and/or stuff that impairs the match of the ECU with how your bike is configured.

About the TPS, most of us prefer setting it rich (that is, higher voltage at idle). Perhaps your dealer set it back with the best of intentions. My guess is that lots of bikes have it too rich and are screwing-up the software idle pop-back switch.

roger albert · 03-04-2009, 06:21 AM

>

Quote:

There are a whole bunch of adjustments for the ECU and/or stuff that impairs the match of the ECU with how your bike is configured.

Gibberish. There is virtually none of that in an M2.4. Ben is so colossally ignorant, and yet still posts stuff of which he knows little to nothing, with a bias towards the latter.

Peter Parts · 06:52 AM

Quote:

Originally Posted by roger albert

>

Gibberish. There is virtually none of that in an M2.4. Ben is so colossally ignorant, and yet still posts stuff of which he knows little to nothing, with a bias towards the latter.

TPS
Hall effect sensor plate
cat code plug
idle stop screws
butterfly adjustments
BBSs
mysterious memory glitches that need clearing (mentioned by Sergio)
covers for vacuum ports that go AWOL (unless you've installed a crossover line)
tired or contaminated O2 sensors, injectors, etc.
and everything that gets examined in a good tune-up

I don't have the patience to list the many ways of "and/or impairing the match" but some include:
missing cat converters, wrong gas, after-market changes to filters, exhausts, induction pieces...

and that's without even thinking about hidden goodies like after-market chips

and so on.

Hope that helps, Roger. No need to apologize.

SergioK · 03-04-2009, 06:36 AM

Quote:

Originally Posted by Peter Parts

My guess is that lots of bikes have it too rich and are screwing-up the software idle pop-back switch.

Really now? You don't say? I had a very distinct problem with this switch (on my old bike). I keep aiming to hit it but since these Bee Emm Dubbyas come with funky switch gear I end up hitting the wrong switch. This one time, I was on an offramp and this a-hole came right into my lane so I hit the wrong switch, can't remember if I got the horn or not but eventually my fingers ended up breaking the switch. Dealer says the pop-back switch has now been replaced with the poop-back switch version 2.0. Says it does everything the original version did but with more poop.

SergioK · 03-04-2009, 06:39 AM

Quote:

Originally Posted by Peter Parts

mysterious memory glitches (mentioned by Sergio)

I never mentioned any mysterious memory glitches.

The procedure to reset the TPS full closed/full open position in the Motronic's memory is in the service manual. I paraphrased it. Besides that, there is, to my knowledge, no other way to adjust ANYTHING, in the Motronic.

Guest24 · 03-04-2009, 06:55 AM

Since we're talking engine temp, I was in the attic yesterday and found an EGT system I removed from a Lycoming engine years ago. If I installed the probes on the headers of my boxer. could I use it to set the TB's? This is just a hypothetical question.

roger albert · 03-04-2009, 11:28 AM

You are right Sergio, and Ben is as ignorant here as in suspension.

Most of those I mentioned, and mentioned that they weren't part of the motronic.
TPS remains the only one. The hall sensor is just crank timing, NOT an input the the motronic.
One doesn't 'tune' with the cat code plug per se. Sure, it can have an effect, but it's not how you fix a stockish bike that is misbehaving, and clearly has nothing to do with the issue at hand here.

No need to apologize Ben. Your ignorance is expected. Some of us are just trying to keep it from rubbing off on others.

roger albert · 03-04-2009, 11:29 AM

Nail,

You could to some extent, but equal temp only means equal mixture if everything else id IDENTICAL. Not bad though, and good info to have.