Question fro Pro Boxer or The Mechanic

[adamski49]

Question for Pro Boxer or The Mechanic

...or anyone else who knows about these things.

Recently tried BB chip, Y piece, K&N etc on my S but found it ran a bit too buzzy for my liking. Unsure if it was down to weak running I briefly tried a techlusion unit and then returned it to stock before getting to the dyno as it didn't feel right.

Getting to the point it appears (having re-read the manual) that I have committed a cardinal sin by disconnecting the motronic unit without disconnecting the negative battery lead when I installed the BB chip. To make things worse I have done this 3 times in all.

My question is have I buggered something up by doing this as although it is now stock again it still runs buzzier than before I started making any mods.

Acceleration and fuel consumption are unchanged and I have had a moditec check done that gives a 'no fault' read out so I assume I have got away with it?

It's just that the bike doesn't run as well as before that makes me wonder if one of the sensors isn't happy or the motronic is not 100% and giving a false read out?

The only other thing that occurred to me was that the 500 miles of possible weak running may have casued some damage to the exhaust valves as the tappet noise is definitely louder than before.

Any thoughts or ideas greatly appreciated as otherwise this is going to bug me on my France trip in 9 days time.

Cheers

Adam

 

[pedahl]

Re: Question for Pro Boxer or The Mechanic

Have you reset the TPS?
if not look here.
http://www.advrider.com/forums/showthread.php?threadid=1767&highlight=TPS+reset

 

[adamski49]

Yep, did it every time although I may just drop a fuse and do it again, you never know.

This was always on my mind as being important... shame I didn't pick up on disconnecting the battery as being equally important, if not more so

Adam

 

[needlongerlegs]

Cambridge Man

Ave yer balanced your throttle bodies recently?

Sounds like your not that far away, so if yer stuck wizz over one night and I'll ave a butchers.

Not a total expert but I have tweaked a bike or two..

And two heads are better than one.

G..Sunny Felixstowe

 

[adamski49]

G

Thanks for the offer but I've done that as well. Nipped down to a guy near Stansted a couple of weeks back who did me a quick twinmax balance - wasn't far out but tweaked it a little. And checked again at the recent moditec check.

I must've disturbed or upset something a little when doing the mods but apart from the vibes it's running as well/quick as before so maybe a 1500 miler round France will sort it out...

Do or die

Adam

 

[Professional Boxer]

could you be more specific about not running right?

i doubt you caused any major problem by not disconnecting the battery, the instructions are really there to prevent any surge of power frying the brain (caused by a short from the battery)

 

[adamski49]

Pro Boxer

By not running right I mean increased harsh vibration.

I made all the performance mods that have been tried and tested by others but the vibration over 4500rpm was so intense that I decided it was not running correctly, possibly lean and after 500 miles of various stages on the BB chip decided to switch it back to stock.

Now it's back to stock it has the vibration in all the usual rev ranges which although better than with the Y piece etc is still harsher than before I made all the mods which makes me believe I've upset something.

I'm leaning towards exhaust gaskets at the moment as they were blowing on the Y piece - couldn't hear it but the gaskets had black soot where it had obviously blown.

I have a new set that I will fit tomorrow in the hope that it makes a better seal and solves the problem. I will let you know how I get on but in the meantime I'd be interested in any ideas you may have.

Thanks for the info on the motronic.

Adam

 

[The Mechanic]

Buzzier than before

Without wanting to create an atmosphere, the (oh dear I've got to mention it) Lambda sensor may just possibly have seen better days. If as you say the exhaust has had an air leak, it could be that the sensor has become tired....slow to react to oxygen content. You could get this checked out either by a competent technician or use either (available from some good factors) a Lambda checker (think thats its name) or a good voltmeter to observe the voltage change. Unless you know what you are looking for it would be safer to get it done by a BMW dealer.
Not trying to put your skills down, just playing safe with your expensive electrics.
Bosch reckon on 60,000 miles for a car Lambda and then its time to replace, however a bike generates more vibes and the environment is a little more hostile.
Some brand new Lambda sensors are too slow for my liking, so you may have had a 'slow one to start with. These are not my thoughts but direct from the Bosch motor tester trainer.
The best option is, new sensor every 15-20,000 miles (we tend to go through spark plugs without a whimper so its not that painful to ensure correct fuelling).
And now enter the 'mines done 4,000,000 miles and is perfect' comment from someone out there.
I may have missed it in your message but valve clearances MUST be checked again if you are to eliminate that uncertain feeling (not nice is it, bit like the period just after you've had an argument with the other half and don't know what to do next).
Wordy piece this, sorry but I hope its useful to you.

 

[The Mechanic]

Buzzier than before

Without wanting to create an atmosphere, the (oh dear I've got to mention it) Lambda sensor may just possibly have seen better days. If as you say the exhaust has had an air leak, it could be that the sensor has become tired....slow to react to oxygen content. You could get this checked out either by a competent technician or use either (available from some good factors) a Lambda checker (think thats its name) or a good voltmeter to observe the voltage change. Unless you know what you are looking for it would be safer to get it done by a BMW dealer.
Not trying to put your skills down, just playing safe with your expensive electrics.
Bosch reckon on 60,000 miles for a car Lambda and then its time to replace, however a bike generates more vibes and the environment is a little more hostile.
Some brand new Lambda sensors are too slow for my liking, so you may have had a 'slow one to start with. These are not my thoughts but direct from the Bosch motor tester trainer.
The best option is, new sensor every 15-20,000 miles (we tend to go through spark plugs without a whimper so its not that painful to ensure correct fuelling).
Extra, have you aligned the exhaust system so that it sits 'well' without being strained at any point?
And now enter the 'mines done 4,000,000 miles and is perfect' comment from someone out there.
I may have missed it in your message but valve clearances MUST be checked again if you are to eliminate that uncertain feeling (not nice is it, bit like the period just after you've had an argument with the other half and don't know what to do next).
Wordy piece this, sorry but I hope its useful to you.

 

[The Mechanic]

Two for the price of one

Sorry now I can bore you twice. Didn't intend to send it two times.

 

[adamski49]

Thanks Mechanic

Strangely enough I asked the BM technician if he could check the sensors (including the lambda) after the moditec gave a 'no fault' read-out and he said he couldn't.

I guess the only way to find out would be to fit a new one and see... but this will have to wait.

Valves will also have to wait till I get back. If it goes bang I will have learnt an expensive lesson, if not happy holidays

Cheers

Adam

 

[The Mechanic]

Electics check

The mechanic that tested your Motronic should know how to check the Lambda sensor easily, its a basic BMW trainging thing, unless he/she has not got to that part of their course yet. A lambda checker is about £15-£20 pounds, I believe Halfords sell them as well as the motor factors.