00' BF115A >starts, runs, dies..

[TumpRnR]

2000 Honda BF115A
BZBD-1100010

Compression:
Cyl 1=215psi
Cyl 2=211psi
Cyl 3=212psi
Cyl 4=215psi

Mid fishing trip was idling fine then just died. Started right back up but would only run for 20-30 seconds then die. No rough idle… Got towed in and parked it.

Trouble is same running in tank. Cold start… sometimes 2-3 minutes run time but mostly 20-30 seconds.

Pulled codes and found “3” (MAP), and “24” (overheat 1). I believe these are old codes as I cleared them and have not seen them again.

Checked tank vent, replaced all fuel filters, cleaned screens/hoses. No water or debris found. Cleaned VST and IAC, PCV checked cleaned.

Fuel pressure was in spec (46psi), but not holding static pressure. Injectors test at ~14ohms (should be 11.1-12.3?) (Note: new injectors test at the same ~14ohms)

Replaced fuel pump, injectors, and fuel pressure regulator.

Trouble found, trouble fixed! New fuel pump fixed static FP issue. Ran for about 7 minutes and back to same issue. Starts and idles smooth for 30ish seconds and cuts like someone just turned it off. No sputter, no change in rpm, no fp drop, just “off”.


Moving on to ignition system…

New spark plugs.

Ignition(pri/sec) and pulser coils resistance tests in spec.

I have a downloaded copy of the shop manual. Flow charts are fun… Thought I had it figured out with fuel system issue, but guess not. Could use a little nudge to keep at it. Lol

 

[jgmo]

Well, you've done alot!

Answered each of my questions as I read down the list you gave.

The injector ohm discrepency could be the fault of the manual you're using. I don't know. I have never worked on a 115A and don't have SI

Being a 2000 model, I guess that leaves out using the Dr. H. I would really like to see pulse width at injectors during the shut down. I would try my cheap, little Harbor Freight noid light set to see pulses but it doesn't work on everything

Being COP coils, not sure how hard it would be to try a timing light on that one

You might try verifying supply voltage to ignition coils and injectors during cut off to see if anything goes suddenly missing.

I would definitely be looking at emergency stop circuit and ignition switch for something like this. Vibration is a bee-atch.

I'll be following and offer any bright ideas I have no matter how much laughter they may evoke.

I think if you keep digging, you'll soon get it figured out

Good luck.