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Suggestions for diagnosing engine missing - '05 R1200ST

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STBeemerRider
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Last seen: 1 week 1 day ago
Joined: 2014-01-29 12:47
Suggestions for diagnosing engine missing - '05 R1200ST

I'm having a progressivley worse issue with misfires on my '05 R1200ST.,which now has about 54K miles on it.   What's happening is that when accellerating, the engine seems to cut out for a few seconds, then catches again.  It originally happened at high revs but is now common at low and midrange.  The engine is smooth and steady at all cruise speeds, but the gas mileage is off a lot.  Not sure if it's related but I was using some high performance European plugs in the bike and they gave out rather early.  The engine was difficult to start and it seemed like only one cylinder was working.  Changing the plugs helped and I also changed the fuel filter at that time as well  and it ran normally except for a much increased frequency of these misfires.  I read where someone had similar issues that ended up being related to corrosion at the Throttle Position Sensors connectors, but can find no reference to such sensors in the BMW service manual.  I have a GS911 and if shows there are no registered faults.  At this point I'm not sure what system to check - ignition - fuel injection - engine sensors - so I'd appreciate any suggestions or recommendations from anyone that might have encountered similar issues.

STBeemerRider
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Last seen: 1 week 1 day ago
Joined: 2014-01-29 12:47
Re: Suggestions for diagnosing engine missing - '05 R1200ST

BTW - probably the best way to describe what the bike is doing would be if the ignition switch was turned off for a moment and then turned on, except there's no backfire you'd get if you really did this....

 

AZgman
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Last seen: 2 days 3 hours ago
Joined: 2003-12-19 00:00
Re: Suggestions for diagnosing engine missing - '05 R1200ST

It is most likely fuel related. Pull the fuel pump assembly and look for a split hose or a restriction of some sort.

'17 R1200GS

MOA 107139

RA 28511

 

STBeemerRider
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Last seen: 1 week 1 day ago
Joined: 2014-01-29 12:47
Re: Solution for for engine missing - '05 R1200ST

This problem has been solved.  It turns out I had an ignition coil (coil on plug) unit going bad.  I noticed this using an in-line spark tester and saw the bright spark light would dim for several hits, then return to bright.  This coincided with a drop in revs in idle, and when I swapped the plug caps, this pattern shifted to the other cylinder.  I've now replaced that cap and it's running great, again!

AZgman
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Last seen: 2 days 3 hours ago
Joined: 2003-12-19 00:00
Re: Suggestions for diagnosing engine missing - '05 R1200ST

Awesome!

'17 R1200GS

MOA 107139

RA 28511

 

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