K75 refuses to start - K-Bikes.com - Excellence in Motion
 
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post #1 of 7 (permalink) Old Mar 26th, 2011, 4:07 pm Thread Starter
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K75 refuses to start

Well, I think, well in fact I'm positive I have cracked my wiring on the K75 engined car. Fuel pump fires up, injection relay clicks in, coils are firing and I am getting power to and from the fuel CU and injectors.

I have tried to start the engine and i get lots of coughs and splutters but not a complete up and running sound.

Has anyone got any ideas what to try? I serviced the engine before installation I.e. oil and filter change, air filter, spark plugs. These were purchased from a BMW specialist, James sherlock. The only thing I didn't touch is the injectors.

Could the injectors need changing??? Is there a way to check them prior to replacement
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post #2 of 7 (permalink) Old Mar 26th, 2011, 4:17 pm
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Was it running before you installed it? If it sat for a while then the injectors might be clogged.
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post #3 of 7 (permalink) Old Mar 26th, 2011, 4:50 pm Thread Starter
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As far as I am aware, the engine ran before the guy broke it for spares. I told him i wanted the whole bike, but wasn't fast enough.
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post #4 of 7 (permalink) Old Mar 27th, 2011, 12:07 am
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I remember a thread somewhere about testing the injectors by pulling one, grounding it and running the engine to check the spray pattern. Might be worth a try.

1987 RED K75S
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post #5 of 7 (permalink) Old Mar 27th, 2011, 10:29 am Thread Starter
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Well, I bit the bullet today and decided to pull the injectors and have a look since everything else tested ok.

Pulled them out and they were BROWN. I put my multimeter on and they tested 16 ohm, so in specs. I put my test probe on and gave it 12v and no click of anything. Looking at the nozzle end of the injector, It's not been firing as it's not damp or anything, so i assume junk.

Just priced up new replacements and cheapest BMW peoples prices was 75 each ( $114 each) + 20% TAX (damn the government ) = 90 each ($136) I got out a injector catalogue i had knocking about and found two replacements with identical resistance and flow rate.

bosch, 0280 150 208 and 0280 150 211

Little bit of research later and found they are fitted to a selection of american vehicles and a few european models.

bit more research and turned up a few cross reference to other manufacturers catalogues and gave a local car parts dealer a call with the numbers. They didn't have them in stock, but will have them for me tomorrow for the nice sum of 17 each ($25.84) + tax = 20.40 each ( $31 each)

So for 61.20 ( $93) I have got a brand new set of injectors, I don't think I could have these sent away and serviced for that price
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post #6 of 7 (permalink) Old Mar 27th, 2011, 11:58 am
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1987 RED K75S
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post #7 of 7 (permalink) Old Mar 29th, 2011, 7:58 am Thread Starter
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Just dropped the new injectors into the motor, turned it over and couple of pops and bangs, but still nothing.

Just as a matter of course, I have double checked the plugs, leads and coil wiring to make sure they are right way round and they are. I check the firing of the leads with a strobe light

#1 cylinder front of engine to first coil - black / blue wire
#2 middle cylinder to middle coil - black / red wire
#3 rear cylinder to last coil - black / green wire

I have check continuity through the harness and everything is working as should do. Only thing I can possible think of is when i tested the harness between the injectors and Fuel CU, I should have power when cranking to green/yellow (which I do) to pin 9 Fcu and to the injectors (fcu removed)

When I check continuity from pin 9 FCU to either pin on injectors, it shows continuity but also shows continuity to pin 12 FCU no matter which pin on injector is touched.

Can't make heads or tails of that one
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