BMW K bikes (Bricks)

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1Back to top Go down   How bad did I screw up? SOLVED Empty How bad did I screw up? SOLVED on Sun Aug 02, 2020 11:31 pm

wkordo

wkordo
active member
active member
I just picked up my first K100. It is a running project bike that I'm making into a cafe racer. It ran fantastic when I picked it up, then halfway through the 10hr drive home a strap broke and it dumped on my trailer (the bike is cosmetically ok thank god) I smelled some gas, but it was 2am so I just strapped it down and kept driving. This morning I unloaded it and tried to start it and it was POURING gas out the exhaust and wouldn't start(it has open headers until I finish welding the new pipe). I pushed it into the garage and pulled the plugs to let it dry out. A few hours later I tried again and it did the same thing. Finally when the tank was almost empty it started, but was clearly sputtering, filled the tank up and back to pouring gas. So what I have gathered so far since it did start is that its getting spark, has compression still, and is obviously getting way too much fuel. The oil level is good in the sight glass, so the gas isn't getting past the rings yet. All the wire connections look good, and there is no visible damage. 
Where do I go from here? Is this from it dumping on the trailer or did something maybe just rattle loose?



Last edited by wkordo on Tue Aug 04, 2020 8:45 pm; edited 1 time in total

    

2Back to top Go down   How bad did I screw up? SOLVED Empty Re: How bad did I screw up? SOLVED on Mon Aug 03, 2020 5:39 pm

wkordo

wkordo
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active member
After tinkering with it more today, I've found that if I unplug the fuel pump the bike will start and run fine on what is in the fuel rail. As soon as I plug the fuel pump back in, it instantly dies. Would my next logical step be to check the FPR?


__________________________________________________
1985 BMW K100
1986 BMW K75

The other ones:
1968 Honda CB350
1973 Puch Maxi Luxe
2005 Kawasaki Vulcan 800
    

3Back to top Go down   How bad did I screw up? SOLVED Empty Re: How bad did I screw up? SOLVED on Mon Aug 03, 2020 6:22 pm

MartinW

MartinW
Life time member
Life time member
When checked the plugs should be wet due to over fuelling. It is possible that the connector to the temperature sensor has a bad connection due to the drop. Check the sensor values and all the connections.

Regards Martin.


__________________________________________________
K75s Hybrid
    

4Back to top Go down   How bad did I screw up? SOLVED Empty Re: How bad did I screw up? SOLVED on Mon Aug 03, 2020 9:01 pm

wkordo

wkordo
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After spending most of the day going through the bike using the troubleshooting EFI guide, here is what I have found:
The temp sensor, airflow meter, and FPR are all good. The fuel pressure measured at about 32psi. When I pull the injectors and crank the bike, they only fire after the starter button is released, and they seem to be spraying a very excessive amount of fuel. When I disconnected the EFI computer, I dumped a substantial amount of water from it, likely from it being on the trailer in the rain. 
Based of what I have found, it seems like the wrong signal is being sent to the injectors. Is it likely that the computer is the cause of my problem? Is there anything else I can check?


__________________________________________________
1985 BMW K100
1986 BMW K75

The other ones:
1968 Honda CB350
1973 Puch Maxi Luxe
2005 Kawasaki Vulcan 800
    

5Back to top Go down   How bad did I screw up? SOLVED Empty No go on Mon Aug 03, 2020 9:54 pm

daveyson

daveyson
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I would wait for it to dry or help it dry out,  then use electrical cleaner on connections.

Unplug earth from the coils before checking fuel spray, some people end up with a fire after doing that, in case you didn't already.

Was the fuel spray constant or pulsing?

Do you mean it sprays when the start button is released and doesn't stop until the key is turned off?


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
    

6Back to top Go down   How bad did I screw up? SOLVED Empty Re: How bad did I screw up? SOLVED on Mon Aug 03, 2020 10:13 pm

wkordo

wkordo
active member
active member
@daveyson wrote:Was the fuel spray constant or pulsing?

Do you mean it sprays when the start button is released and doesn't stop until the key is turned off?
The spray was constant. It sprays when the start button is released and stops several seconds later.


__________________________________________________
1985 BMW K100
1986 BMW K75

The other ones:
1968 Honda CB350
1973 Puch Maxi Luxe
2005 Kawasaki Vulcan 800
    

7Back to top Go down   How bad did I screw up? SOLVED Empty Re: How bad did I screw up? SOLVED on Mon Aug 03, 2020 11:02 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Get some isopropyl rubbing alcohol 90% from the drugstore and flush the ECU and it's connector with it to remove the water.   Dry it gently with a hair dryer.

With any luck it hasn't been wet long enough to cause any serious corrosion.  Clean the connectors with deoxit.  That should get things back to whatever condition preceded the soaking.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

8Back to top Go down   How bad did I screw up? SOLVED Empty Re: How bad did I screw up? SOLVED on Tue Aug 04, 2020 8:50 am

92KK 84WW Olaf

avatar
Life time member
Life time member
The FICU is a most likely cause of your troubles. Good thing is they are quite robust. As said get it dried out using patience too. Then make sure to clean the pins before plugging it all back together.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles.
    

9Back to top Go down   How bad did I screw up? SOLVED Empty Re: How bad did I screw up? SOLVED on Tue Aug 04, 2020 9:11 am

yamaguzzi

yamaguzzi
Platinum member
Platinum member
@Point-Seven-five wrote:Get some isopropyl rubbing alcohol 90% from the drugstore and flush the ECU and it's connector with it to remove the water.   Dry it gently with a hair dryer.

With any luck it hasn't been wet long enough to cause any serious corrosion.  Clean the connectors with deoxit.  That should get things back to whatever condition preceded the soaking.
Good luck getting Alcohol these days !


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

10Back to top Go down   How bad did I screw up? SOLVED Empty Re: How bad did I screw up? SOLVED on Tue Aug 04, 2020 12:14 pm

wkordo

wkordo
active member
active member
SOLVED!
As suggested, the FICU was corroded from the water, a little more than could be solved by sloshing with alcohol. 
Last night I opened up the FICU and used alcohol on Q-tips to clean up a section of particularly bad oxidation. There is a foam strip meant to protect the circuit board that had trapped a layer of water against it and caused some nasty build up. After a thorough cleaning (and replacing an injector o-ring I tore because I didn't lube it enough   Mad) the bike fires up and runs great. Next job is coming up with a better location for the FICU to keep it dry in the future.


__________________________________________________
1985 BMW K100
1986 BMW K75

The other ones:
1968 Honda CB350
1973 Puch Maxi Luxe
2005 Kawasaki Vulcan 800
    

11Back to top Go down   How bad did I screw up? SOLVED Empty Re: How bad did I screw up? SOLVED on Tue Aug 04, 2020 4:56 pm

Laitch

Laitch
Life time member
Life time member
@wkordo wrote:. . . then halfway through the 10hr drive home a strap broke and it dumped on my trailer (the bike is cosmetically ok thank god) I smelled some gas, but it was 2am so I just strapped it down and kept driving.
Did it drop onto its right side and that's how it was strapped for the remainder of the journey?


__________________________________________________
1995 K75 81,000 miles
How bad did I screw up? SOLVED Usa-lo10
    

12Back to top Go down   How bad did I screw up? SOLVED Empty Re: How bad did I screw up? SOLVED on Tue Aug 04, 2020 8:45 pm

wkordo

wkordo
active member
active member
@Laitch wrote:Did it drop onto its right side and that's how it was strapped for the remainder of the journey?
It dropped onto its right side and I picked it back up and strapped it upright again.


__________________________________________________
1985 BMW K100
1986 BMW K75

The other ones:
1968 Honda CB350
1973 Puch Maxi Luxe
2005 Kawasaki Vulcan 800
    

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