Accereration Hesitation--first and second gear - BMW Luxury Touring Community
 
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post #1 of 13 Old Jul 27th, 2006, 6:26 pm Thread Starter
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Accereration Hesitation--first and second gear

My 03 LT has only 15k on it. All service has been done by dealer including the 12K not long ago...............

When starting off in first, as I let the clutch out, there is a "chugging" of the engine for a second or two until a little speed ( or RPM?) is built up then the engine smooths out. When I shift to second, ditto as I start out in second.

This is my first K12 but I own a K75S and I have owned a K100RT and most surely do not and did not have this problem with either of those K bikes.

Anyone have this problem in the past? I am wondering if the throttle bodies are dirty, etc. Seems the dealer should have taken care of this at 15K, but I can't seem to remember the problem then............................

If you have experience or an educated guess I'd like to hear it.

Thanks,

Tom

Tom

2003 R1150RT, Black Beauty--this is one sexy bike!
1999 R1100GSA, Does everything well, what else can one say?
1992 K75SA, If this engine had been 4-valve instead of 2, it would be the smoothest BMW ever built!
1978 R100S, my first and favorite BMW.
1976 R75/6, A 30 year old gentlemen I still love to take out for a Sunday ride.
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post #2 of 13 Old Jul 27th, 2006, 6:29 pm Thread Starter
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Woops, I meant the dealer should have taken care of this at the 12K service a few months ago.....I said at 15K. Sorry.

Tom

Tom

2003 R1150RT, Black Beauty--this is one sexy bike!
1999 R1100GSA, Does everything well, what else can one say?
1992 K75SA, If this engine had been 4-valve instead of 2, it would be the smoothest BMW ever built!
1978 R100S, my first and favorite BMW.
1976 R75/6, A 30 year old gentlemen I still love to take out for a Sunday ride.
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post #3 of 13 Old Jul 27th, 2006, 6:57 pm
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Has the brown jumper wire for the computer programming change been cut? In hot weather the program on the Motronic retards the timing and causes a hesitation problem. Cutting the jumper changes the Motronic to a secondary program that resolves this problem. The jumper is to the right side main frame just in front of the passenger seat. Sometimes it is taped into the wiring harness bundle. Your dealer should be able to show you where it is. I would put a switch in the line so you can switch it back in cooler temperatures.

Jim Davidson
2007 R1200RT
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post #4 of 13 Old Jul 27th, 2006, 9:10 pm
 
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On my '04 LT it was doing the same thing, especially when "short shifting" (lower RPM upshift). Dealer found the stub pipe was off the connecting galley at the manifold. I can't say I know what that really means from a mechanics view but it solved the problem. Coincidentially, my gas mileage improved by about 5 mpg after the repair was made.
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post #5 of 13 Old Jul 27th, 2006, 9:48 pm
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Jim already said it and I second it.
Brown wire,
it does make the difference.


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post #6 of 13 Old Jul 28th, 2006, 12:36 pm Thread Starter
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So that is what the infamous brown wire is for!!?? Yes, I see it on the right side under the seat. It is a little loop. And yes, it will be quite easy to cut and then put two connectors on the ends to enable me to connect and disconnect in winter and summer.

Makes sense too. I did not do this last winter but the hotter it has gotten here the worse it has gotten. Here in Alabama it has been above 90 and mostly above 95 for most of the summer and August is usually worse.

I will try this. Thanks, Tom

Tom

2003 R1150RT, Black Beauty--this is one sexy bike!
1999 R1100GSA, Does everything well, what else can one say?
1992 K75SA, If this engine had been 4-valve instead of 2, it would be the smoothest BMW ever built!
1978 R100S, my first and favorite BMW.
1976 R75/6, A 30 year old gentlemen I still love to take out for a Sunday ride.
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post #7 of 13 Old Jul 28th, 2006, 1:07 pm
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I would just leave it cut. I cut mine on my 02 and it runs fine winter and summer. Remember to use 93 octane after you cut it since the timing will be advanced.
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post #8 of 13 Old Jul 28th, 2006, 1:39 pm
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What RPM are you shifting at? Would shifting at a higher RPM stop it?

The Brown Wire cut only makes a difference when it is hot, and throttle application between 2500-3000 RPM. BUT that is in any gear, not just first and second.
Try shifting above 4500 and see if not letting the RPM drop below around 3300 makes a difference.

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post #9 of 13 Old Jul 28th, 2006, 4:23 pm
 
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The brown wire on my LT was cut. Still had the hesitation. My earlier post about the galley connector holds true in my case.
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post #10 of 13 Old Jul 28th, 2006, 7:10 pm Thread Starter
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nasLT-- A loose connection would definitely give you a power loss situation.

David, you are correct that I do not notice it after shifting into second if at high RPM. Say above 4K. But I notice it in first just trying to get up to higher RPM-- like just after I let out the clutch from a stop. I will cut the brown wire first and try that. I also did not notice it at all until the temp got up this summer.

Sounds like there is little danger in cutting the wire. A hey, any wire that has been cut can be reconnected if performance is worse. Not afraid to try a fix that I know I can reconnect later if need be.

Will do this Sat AM. Looking forward to the test drive. Will report my findings!

Tom

Tom

2003 R1150RT, Black Beauty--this is one sexy bike!
1999 R1100GSA, Does everything well, what else can one say?
1992 K75SA, If this engine had been 4-valve instead of 2, it would be the smoothest BMW ever built!
1978 R100S, my first and favorite BMW.
1976 R75/6, A 30 year old gentlemen I still love to take out for a Sunday ride.
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post #11 of 13 Old Jul 29th, 2006, 4:06 pm Thread Starter
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Wink

OK...............back from the test ride after cutting the brown wire.

Wow, what a bike I have after all! Easiest tune up I ever gave a bike!

Actually it was below 80 degrees this AM for the first time in a while. I went first with the wire uncut. Noticed much less hesitation than with temps in the 90s but did notice some--around 77 degrees. Went home, cut the wire and back out. What a difference! Smooth acceleration from clutch engagement thru shifting and again etc. Rode a couple of hundred miles and included a great catfish lunch in a different city, but I digress. By the time I got back, midafternoon, it was much hotter, in the 90s and the bike still ran great.

Thanks to David, Jim and Hans for the help! Where do I send the check?

Tom

2003 R1150RT, Black Beauty--this is one sexy bike!
1999 R1100GSA, Does everything well, what else can one say?
1992 K75SA, If this engine had been 4-valve instead of 2, it would be the smoothest BMW ever built!
1978 R100S, my first and favorite BMW.
1976 R75/6, A 30 year old gentlemen I still love to take out for a Sunday ride.
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post #12 of 13 Old Jul 29th, 2006, 11:14 pm
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Quote:
Originally Posted by bmwrubbercow

Thanks to David, Jim and Hans for the help! Where do I send the check?
here!

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post #13 of 13 Old Jul 30th, 2006, 6:01 am
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I'd have to heartily second that. It just blows my mind all the bucks folks save here. Just one dollar contributed to the site would help them out. You wouldn't believe what it costs them to keep this site, which I am addicted to, running.

So, if you don't want to help them, please help this poor, old addict. I can see myself on a corner with a sign: "Will work for BMWLT access".



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