BMW K bikes (Bricks)

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1Back to top Go down    1984 K100RT Fuel and running issue. on Mon Jun 19, 2017 6:18 am

92KK 84WW Olaf

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A question for my 84 K100RT.

Since the start of the year have done lots.......but I have a not good running issue I need to resolve as its affected fuel consumption as well as the running. I took it for a camping weekend and there was an improvement since the most recent change, as in new injectors but still not right.

Service, plugs, air filter, coolant etc all good.

Things I have done as part of what I had planned.

Swapped coils with LT. No change.
Changed injectors. Very significant change, cleaner start, cleaner pick up but still have a diesel knock at cold and excess fuel consumption.
TPS is working and has connections cleaned. That made a big difference.

I can swap out both ICU and FICU with my spares, but am wondering should I be looking at anything else?


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 87,100 miles
1997 K1100LT 58,000 miles
    

2Back to top Go down    Re: 1984 K100RT Fuel and running issue. on Mon Jun 19, 2017 7:59 am

duck

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Cracked throttle body boots?

Have you tried swapping the spark plug leads?


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

3Back to top Go down    Diesel Knock? on Wed Jun 21, 2017 9:19 pm

tagaz

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Diesel Knock?

I read that the later 84 production bikes was when the design changed for unleaded fuel.

Is it possible your bike wants/needs lead substitute to run properly?
Just a stab in the dark.
My 81 R65 airhead needed the valve seats changed for unleaded fuel compatibility.
Don't know if same holds true with kbikes.

    

4Back to top Go down    Re: 1984 K100RT Fuel and running issue. on Thu Jun 22, 2017 5:58 am

92KK 84WW Olaf

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Tagaz

You are right about the leaded/unleaded fuel. I would go with thatbut I have put over 50k miles on it in the last 4 years without any unusual running/knocking/fuel related problems and when I got it first the fuel mileage was better than on the 92 LT at a comfortable 10 miles per litre and 11 miles per litre off motorway.

In terms of starting, pick up etc all is good and very clean. The diesel sound is only happening at cold too so nor really sure where its pointing.

We have a workshop on Saturday and going to take the opportunity to look at the rubbers etc and will swap plug leads again.

I have a trip to France in September and have my fuel stops worked out at about 100 mile intervals but would prefer to plan 3 stops 2 hours apart rather than 4 stops.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 87,100 miles
1997 K1100LT 58,000 miles
    

5Back to top Go down    fuel injector control unit on Thu Jun 22, 2017 12:25 pm

tagaz

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have u swapped out the FICU yet?
if engine is dieseling ie. running on after ignition is off, then where/how is the fuel getting into the cylinder?

or is it possible the knock is from the bottom end not the cylinder ie. pston slap?
compression test?

    

6Back to top Go down    Re: 1984 K100RT Fuel and running issue. on Thu Jun 22, 2017 1:18 pm

92KK 84WW Olaf

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No running on ever. The knock is same sound you get on a diesel engine with injector issues, as opposed to the normal sound of a diesel. On diesel cars over 30 years so fairly used to the difference.

Swapped injectors as one was definitely leaking and a second was suspected of leaking. Brand new set gone in and that made a difference. No wet plugs and no staining on manifold after being parked up.

Sounds is definitely not piston slap, also no oil consumption or topping up needed.

All headers now run to same temperature when I fire up, before I changed the injectorsthere was a difference which also pointed to no 4 leaking. Injectors were all intact when they came out.

FICU probably get changed tonight, will see if that makes any difference. I will swap ICU at the weekend.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 87,100 miles
1997 K1100LT 58,000 miles
    

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