Poor throtle response gs 1150

[xtzanos]

Last month I bought a '01 gs 1150 with 29thousand klm and since then I have done 2 thousand.
The bike has new sparkplugs, the throtle bodies are synchronized and the valves are adjusted. It has a K&N air filter.
My problem is that the bike does not response to the opening of the throtle in 2 cases. With a steady throtle and especially first or second gear it doesnt ran smoothly. At high speed if i open the throttle sharply (especially with 5 and 6 gear ) sometimes accelerates and others not. In the last 800klm I used a injector cleaning fluid but it did not change anything.
The color of spark plugs is normal to white which i think indicates poor mixture.
Right now and for the next months will be in Bulgaria where there are'nt any bmw services to check the fuel system. Any ideas of what to look;

 

[Fanum]

Is it a twin spark model?

If so, I'd suspect one (or both) of your plug coil packs are breaking down .

 

[Colban]

An 01 bike will be single spark.
Have you checked the TPS (throttle position sensor) voltage.Should be about 0.37V.
It sounds like its running a bit weak.If one plug is lighter than the other,try swapping over the injectors to see if the problem moves.
Can you also refit the original airfilter (K&Ns can cause weak running).
Do a search on Cat Code Plug.You can buy (or make) jumpers that go in the relay box and can change fuelling maps in the ECU for different conditions.
Also possibility of partially blocked fuel filter.

 

[Timolgra]

An 01 bike will be single spark.
Have you checked the TPS (throttle position sensor) voltage.Should be about 0.37V.
It sounds like its running a bit weak.If one plug is lighter than the other,try swapping over the injectors to see if the problem moves.
Can you also refit the original airfilter (K&Ns can cause weak running).
Do a search on Cat Code Plug.You can buy (or make) jumpers that go in the relay box and can change fuelling maps in the ECU for different conditions.
Also possibility of partially blocked fuel filter.

In addition to Colban's suggestions, I would remove the motoronic fuse (number five from the left I think).
Turn the ignition on.
Open and close the throttle fully and slowly a couple of times.
Turn the ignition off and replace the fuse, then try it.

 

[Steptoe]

In addition to Colban's suggestions, I would remove the motoronic fuse (number five from the left I think).
Turn the ignition on.
Open and close the throttle fully and slowly a couple of times.
Turn the ignition off and replace the fuse, then try it.

Thats wrong - with the fuse removed the motronic won't be recieving anything .

Pull fuse, wait ten seconds, replace fuse.
Turn ignition on, open/close throttle tree times, turn ignition off.
Turn ignition on and start engine.

But this isn't a cure for any running problems, as the bike does this procedure automatically as you use it.

 

[Timolgra]

Thats wrong - with the fuse removed the motronic won't be recieving anything .

Pull fuse, wait ten seconds, replace fuse.
Turn ignition on, open/close throttle tree times, turn ignition off.
Turn ignition on and start engine.

But this isn't a cure for any running problems, as the bike does this procedure automatically as you use it.

Bugger i've been doing it wrong for years, no wonder it didn't make any difference.

 

[ianboydsnr]

service, when were plugs last changed?

water in fuel?

 

[Timolgra]

The bike has new sparkplugs,

Here's a clue Sherlock

 

[xtzanos]

I replace the sparplugs yesterday as i found that they (the shop i bought it) had put wrong ones. After that the bike looks much more powerfull but the throttle problems are still here.
I really dont know how to check the tps voltage and i dont have a polymeter (if that 's the name of the device)
"If one plug is lighter than the other" the plugs have exactly the same color if that's how i check this.
"try swapping over the injectors to see if the problem moves" how can this be done?
"Can you also refit the original airfilter" sory but i dont have the original .
I ll try to do the motronic reset with the fuse and search for the
Cat Code Plug. Thanks guys

 

[xtzanos]

Ι did the reset to the motronic but nothing seemed to change.
I also took out the spark plugs covers (one each time) to see if i have electricity.
The right one was ok i could see a spark between the cover and the head. When i took the left one i had a small electroshock. Could this be the cause of my problem? Both caps and its wires look ok with no cracks or scratches.

 

[pomm001]

Last month I bought a '01 gs 1150 with 29thousand klm and since then I have done 2 thousand.
The bike has new sparkplugs, the throtle bodies are synchronized and the valves are adjusted. It has a K&N air filter.
My problem is that the bike does not response to the opening of the throtle in 2 cases. With a steady throtle and especially first or second gear it doesnt ran smoothly. At high speed if i open the throttle sharply (especially with 5 and 6 gear ) sometimes accelerates and others not. In the last 800klm I used a injector cleaning fluid but it did not change anything.
The color of spark plugs is normal to white which i think indicates poor mixture.
Right now and for the next months will be in Bulgaria where there are'nt any bmw services to check the fuel system. Any ideas of what to look;

Your note suggests that all was OK before the service?
if they got the plugs wrong i would be concerned that they have not sycro'd the throttles correctly.
Before you change everything make sure that this has bee done correctly,make sure all the cables are seated correctly
only change one thing at a time
look for the easy things first

 

[xtzanos]

The bike had wrong plugs when i bought it. I rode it to greece where they synchronized the throtles but they didnt check the plugs. I rode back to bulgaria where i found out i had wrong plugs so i changed them (which made a big difference). I also adjusted the valves clearances.
Do you mean the throtle cables?

 

[kanhulk13]

yes..he means the throttle cables should be seated properly. After lifting the tank the sheath and metal knurl can shift...do a quick search and you'll find a picture. Easier than trying to describe.
Unlikely this is your problem as this creates major starting and running problems (runs ~ on 1 cylinder, diff to start).

 

[xtzanos]

Me again guys. Just to inform that after replacing the fuel filter and cleaning the injections i found out that my bike has motronic ( central management we call it, sory for my english ) from a 850 gs.
But it is worse cause i tried a motronic from a crashed 1150 that it supposed to work but again it didn't work properly

 

[argos]

I do NOT know if this would work but someone will be able to correct me if this suggestion is nonsense.Would it be possible to fit an 1150gs "performance" chip to the 850gs motronic unit,then use the closest to standard 1150 map?Just thinking it would save a lot of money?Apologies if its not possible,anyone know?

 

[Steptoe]

?Apologies if its not possible,anyone know?

I doubt it's possible - you can't even use a chip from a same model bike in a different year motronic.

 

[argos]

oh well just an idea,cheers Steptoe

 

[xtzanos]

Thans for the ideas but i will propably have to search what else has been changed. Does the 850 has an L sensor?
(while i was in greece i took the bike to a bmw dealer.
He told me that when he did the electronic diagnose at first he found out that the L sensor doesnt work, but when he checked the sensor itselfe it worked so he thought that the motronic need replacement.
When i checked the motronic i found out from its code that it's from a 850 gs.
He also told me that the hall sensor is replaced)

 

[Supertech]

Found the Bosch book of motronic in my local library....well worth a read.