Starts easily then dies at idle, vacuum OK - BMW Luxury Touring Community
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post #1 of 5 Old Apr 5th, 2017, 1:57 pm Thread Starter
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Starts easily then dies at idle, vacuum OK

I have not been able to drive my 3 wheeled Trimagnum with a 2002 K1200LT for quite awhile due to this problem.

Engine starts easily, idles at 1000 for 15 seconds, then idle speed drops and engine dies. I can rev the engine to higher speeds but will die at idle weather engine is hot or cold.

Drained tank and added new fuel. Cleaned and checked gap on spark plugs. Check vacuum lines for leaks.

I am an auto and motorcycle mechanic but this persistent problem baffles me.

Any suggestions?

Tim
Tucson, AZ
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post #2 of 5 Old Apr 5th, 2017, 2:29 pm
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Re: Starts easily then dies at idle, vacuum OK

I'm merely guessing, since my wifes Jeep Liberty did the same thing. Camshaft and crankshaft sensors fixed it.

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post #3 of 5 Old Apr 5th, 2017, 2:29 pm
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Re: Starts easily then dies at idle, vacuum OK

Quote:
Originally Posted by kolbbmw View Post
I have not been able to drive my 3 wheeled Trimagnum with a 2002 K1200LT for quite awhile due to this problem.

Engine starts easily, idles at 1000 for 15 seconds, then idle speed drops and engine dies. I can rev the engine to higher speeds but will die at idle weather engine is hot or cold.

Drained tank and added new fuel. Cleaned and checked gap on spark plugs. Check vacuum lines for leaks.

I am an auto and motorcycle mechanic but this persistent problem baffles me.

Any suggestions?

Tim
Tucson, AZ
Tim,

I am quite familiar with Motronic EFI on a "stock" K1200 engine as installed on K1200RS and K1200LT.
HOWEVER, I have no idea if your 3 wheels beast has a stock engine, Throttle-bodies and ALL stock BOSCH Motronic components.

Troubleshooting these things at a distance is far from easy (without seeing , testing myself).
BUT... assuming all components are from a stock K1200LT, I would begin with this:

(1) QUESTION: do you have access to a GS911 or a dealers computer to read any fault codes?
(2) QUESTION: any modification or maintenance that was done just before problem started ?

(3) have you made a longer ride (full warm up) to check higher RPM pulling power on the road - any hesitations ?

(4) You can do some basic tests on the TVA (idle-Actuator) after you remove it from the Throttle-bodies. See attached PDF document...

(5) Check for a loose or badly plugged (not fully inserted) TVA connector. The TVA (idle actuator) is needed to maintain proper idle RPM with engine cold and warm.
See 1st photo in the PDF document for location.
Attached Files
File Type: pdf BMW_K1200_Throttle-Valve-Actuator TVA (version 1-3).pdf (357.0 KB, 87 views)
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-------------------------------------------------
John (Montreal, CANADA)
K1200RS (2002 IceBlue/Red - 95,000 miles)
-------------------------------------------------
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post #4 of 5 Old Apr 5th, 2017, 2:59 pm Thread Starter
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Re: Starts easily then dies at idle, vacuum OK

Quote:
Originally Posted by sailor View Post
Tim,

I am quite familiar with Motronic EFI on a "stock" K1200 engine as installed on K1200RS and K1200LT.
HOWEVER, I have no idea if your 3 wheels beast has a stock engine, Throttle-bodies and ALL stock BOSCH Motronic components.

Troubleshooting these things at a distance is far from easy (without seeing , testing myself).
BUT... assuming all components are from a stock K1200LT, I would begin with this:

(1) QUESTION: do you have access to a GS911 or a dealers computer to read any fault codes?
(2) QUESTION: any modification or maintenance that was done just before problem started ?

(3) have you made a longer ride (full warm up) to check higher RPM pulling power on the road - any hesitations ?

(4) You can do some basic tests on the TVA (idle-Actuator) after you remove it from the Throttle-bodies. See attached PDF document...

(5) Check for a loose or badly plugged (not fully inserted) TVA connector. The TVA (idle actuator) is needed to maintain proper idle RPM with engine cold and warm.
See 1st photo in the PDF document for location.
Thanks for the comments!
Engine and control system is essentially stock.
Do not have any access to a BMW dealer diagnostic tools.
Last year, I did install a new fuel pump assembly in the fuel tank. Everything worked OK afterwards on short test drive.
Have not driven it for awhile to check power under load. Just accelerations checks in neutral to warm up engine.
I will remove the TVA to do the checks you recommended. It looks just like the one in your picture.
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post #5 of 5 Old Apr 5th, 2017, 7:55 pm
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Re: Starts easily then dies at idle, vacuum OK

Since you installed a new fuel pump I would double check the fuel pressure if it wasn't an OEM pump as well as check the hoses in the tank. They have been known to leak or come loose.
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John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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