Rough running when cold - BMW Luxury Touring Community
 
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post #1 of 8 Old Oct 26th, 2007, 4:02 pm Thread Starter
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Question Rough running when cold

Hey fellas!
Now that it's getting cold out in the mornings, my LT runs like crap when i first start it up. So much so that it will die on me a couple of times before it's warm enough to run. If i give it any gas it's dead for sure.
In one of my earlier posts we talked about wether to let the LT warm up before riding off. Most everyone said that it's to be started and rode off. That's definitely not going to happen like this.

What is necessary to correct this situation? Is it something simple that even I could do (no, i'm not a super-duper mechanic ) or is this something the dealer has to adjust?

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post #2 of 8 Old Oct 26th, 2007, 10:05 pm
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Dennis, try this, after it starts, run the RPM up to 1500-2000 a few times, in the first 5-10 seconds. Put it in gear, then with 1500 rpm, slip the clutch to ride off. If you happen to ride down hill in the first 1000 feet, to a stop sign. Pull the clutch in to keep the rpm above 1500 rpm, or the engine will go sub-idle and stall in the first 30 seconds. It should act like a warm engine after 30 to 60 seconds.

If it takes more time then the above, with your 2007, give us more details. Did you have the 07 last winter? B.B.

Last edited by wilbar00c; Oct 26th, 2007 at 10:36 pm.
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post #3 of 8 Old Oct 26th, 2007, 10:38 pm
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Have you tried resetting the TPS? This might help.

Turn ignition ON but do NOT start the engine.
Open the throttle fully and realease.
Open the throttle fully one more time and release.
Turn ignition OFF.

Then you are ready to get back on the road. Just start the bike as you normally would and ride...

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post #4 of 8 Old Oct 26th, 2007, 10:50 pm
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Disconnect battery for a short while before this procedure. I recommend the negative cable(less chance of shorting the wrenches)for this.


Quote:
Originally Posted by zippy_gg
Have you tried resetting the TPS? This might help.

Turn ignition ON but do NOT start the engine.
Open the throttle fully and realease.
Open the throttle fully one more time and release.
Turn ignition OFF.

Then you are ready to get back on the road. Just start the bike as you normally would and ride...

Only a biker knows why a dog sticks his head out of the car window
Stephen Moore
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1975 R75/6 Black Still running strong
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post #5 of 8 Old Oct 28th, 2007, 11:44 am
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There is no way that this should happen. One or both of the above suggestions might work, but I'd take it to a dealer and have him/her hook it up to the MoDeTec. It's under warrantee, so this should cost you nothing but time. There are at least two temperature sensors (air and coolant), either or both of which may be involved, as well as a host of other digital dohickies (that's the technical term) that send info to the computer, which adjusts the air/fuel mixture for the operating conditions. Sounds to me that you are running too lean on start up, but that's just a guess. Only the MoDeTec can tell you if the sensors and computer are working correctly.

Bill
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post #6 of 8 Old Oct 29th, 2007, 2:49 pm
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Hi Dennis,

I do not have any problems with my 07 not idleing when cold. I usually only let it run for 30 sec before I take off (this is at 5 celcius). I would definately take it back to the dealership to have the problem fixed. The LT should idle fine down to below freezing temps without stalling.



Ken

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post #7 of 8 Old Nov 1st, 2007, 10:13 am Thread Starter
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Thumbs up Sorry it took so long...

He guys, sorry it took so long to respond to your posts.
Thanks for everyone's suggestions.
I guess it would be best to make the 1.5 hour trip and get it checked out.
Being under warranty and all.
I didn't think this seemed right. It's not like it's really been THAT cold so far either (low 40s).
Thanks again!

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post #8 of 8 Old Nov 1st, 2007, 11:59 am
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I had an 04 GT with cold start issues and had the ECU replaced.
Solved the problem, though in that case I think it was a widespread
problem with more than just a few bikes.

Hello 07 R1200S
Bye2006 LT
1982 R65
Buy More Warranty!
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