DF70 Bogging Stalling and Questionable ECU Data

[ghannan98]

Hi All - Appreciate all ideas on this. I'm trying to troubleshoot a nasty problem on a 1999 Evinrude 70 HP Four which I understand to be same as DF70 (open to someone telling me I'm off on that, if I'm wrong). The basic symptoms I have are difficulty with initial cold start and difficulty maintaining a good idle. If i'm able to start and run the engine, it seems to do ok under 3000 rpm (according to tach, see below for intrigue on that), but any abrupt change in throttle leads to bogging/hesitation. Sometimes, if I stay in it, the bogging will clear, but lately the bogging will actually shut down the motor. the motor will restart, usually with no codes (beeps).

I have replaced VST , confirmed clean fuel, see 5psi from low pressure pump and steady 35psi from high, battery is new I have warm , but not hot water from telltale.

I purchased the SDS software and cables from ebay and installed and hooked up for a test at the dock. This is when it gets strange.

I will post the Service Data below , but my first observation was the Tach was off by approx. 500rpm compared to what displayed on the laptop. The idle was approx. 800 according to laptop but was showing 1500 on the tach, which I understand to be high but, adjustable via a known procedure. In looking at the service data below, what I see is a motor (or an ECU?) with 59 hours on it, but I have two cautions in the data that were at 93 hours and one at 44.

Is that even possible? I figure once I know the diagnostic data is reliable, we can start figuring out what to do about it.

Thanks for any ideas.

Save date 12/4/2016
Comment
Engine No. 1-
Boat Type bw nausett
Description first look 12/4/2016
Engine information
Power 70PS
ECM ID 33920-99E12
Spec. ---
Engine Type 4 stroke 1298cc
SERVICE DATA
Item Data Unit
ENGINE SPEED 0 rpm
IGNITION TIMING BTDC 6 ?
MANIFOLD ABSOLUTE PRESSURE 753 mmHg
MANIFOLD ABSOLUTE PRESSURE 100.4 kPa
MANIFOLD ABSOLUTE PRESSURE 29.68 inHg
BAROMETRIC PRESSURE 735 mmHg
BAROMETRIC PRESSURE 97.9 kPa
BAROMETRIC PRESSURE 28.95 inHg
CYLINDER TEMPERATURE 10 ?C
CYLINDER TEMPERATURE 49 ?F
INTAKE AIR TEMPERATURE 11 ?C
INTAKE AIR TEMPERATURE 52 ?F
BATTERY VOLTAGE 12.23 V
FUEL INJ. PULSE WIDTH 0 ?s
INJECTED FUEL AMOUNT 0 mcc
FUEL PUMP DUTY 0 %
IAC VALVE DUTY 0 %
NO. OF MAP SENSOR FAILURE 0 times
NO. OF CKP SENSOR FAILURE 5 times
NO. OF IAC VALVE FAILURE 2 times
NO. OF CMP SENSOR FAILURE 1 times
NO. OF CTP SWITCH FAILURE 0 times
NO. OF CYL. TEMP. SNSR FAILURE 2 times
NO. OF IAT SENSOR FAILURE 4 times
NO. OF EX. TEMP. SNSR FAILURE 0 times
NO. OF FUEL INJECTOR FAILURE 255 times
NO. OF OVER-REVOLUTION 0 times
NO. OF LOW BATTERY VOLTAGE 0 times
NO. OF LOW OIL PRESSURE 4 times
NO. OF OVERHEAT(GRADIENT) 5 times
NO. OF OVERHEAT(TEMP.) 1 times
CAUTION SYSTEM NAME (1) Low oil press
ENGINE SPEED (1) 5563 rpm
MANIFOLD ABSOLUTE PRESSURE (1) 623 mmHg
MANIFOLD ABSOLUTE PRESSURE (1) 83.1 kPa
MANIFOLD ABSOLUTE PRESSURE (1) 24.56 inHg
CYLINDER TEMPERATURE (1) 38 ?C
CYLINDER TEMPERATURE (1) 101 ?F
INTAKE AIR TEMPERATURE (1) 35 ?C
INTAKE AIR TEMPERATURE (1) 96 ?F
EX-MANI TEMPERATURE (1) 196 ?C
EX-MANI TEMPERATURE (1) 385 ?F
FAILURE TIME (1) 93 h
ELAPSE OF TIME (1) 0 min
CAUTION SYSTEM NAME (2) Overheat grad.
ENGINE SPEED (2) 1156 rpm
MANIFOLD ABSOLUTE PRESSURE (2) 241 mmHg
MANIFOLD ABSOLUTE PRESSURE (2) 32.2 kPa
MANIFOLD ABSOLUTE PRESSURE (2) 9.5 inHg
CYLINDER TEMPERATURE (2) 26 ?C
CYLINDER TEMPERATURE (2) 79 ?F
INTAKE AIR TEMPERATURE (2) 14 ?C
INTAKE AIR TEMPERATURE (2) 58 ?F
EX-MANI TEMPERATURE (2) 196 ?C
EX-MANI TEMPERATURE (2) 385 ?F
FAILURE TIME (2) 44 h
ELAPSE OF TIME (2) 0 min
CAUTION SYSTEM NAME (3) Low oil press
ENGINE SPEED (3) 5500 rpm
MANIFOLD ABSOLUTE PRESSURE (3) 583 mmHg
MANIFOLD ABSOLUTE PRESSURE (3) 77.7 kPa
MANIFOLD ABSOLUTE PRESSURE (3) 22.96 inHg
CYLINDER TEMPERATURE (3) 38 ?C
CYLINDER TEMPERATURE (3) 101 ?F
INTAKE AIR TEMPERATURE (3) 35 ?C
INTAKE AIR TEMPERATURE (3) 96 ?F
EX-MANI TEMPERATURE (3) 196 ?C
EX-MANI TEMPERATURE (3) 385 ?F
FAILURE TIME (3) 93 h
ELAPSE OF TIME (3) 0 min
TOTAL OPERATION TIME (HRS.) 59 h
TOTAL OPERATION TIME (MIN.) 56 min
0-1000 RPM 50 min
1000-2000 RPM 1678 min
2000-3000 RPM 1028 min
3000-4000 RPM 602 min
4000-5000 RPM 216 min
ABOVE 5000 RPM 22 min
ELAPSE TIME FROM REMINDER CANCEL 65535 h
NO. OF OIL CHANGE REMINDER 255 times
COMPENSATION FACTOR (ZONE 1) 1
COMPENSATION FACTOR (ZONE 2) 1
COMPENSATION FACTOR (ZONE 3) 1
TIME OF LAST O2 FEEDBACK 0 h
EMERGENCY STOP SWITCH OFF
CTP SWITCH ON
NEUTRAL SWITCH ON

 

[ghannan98]

##SOLVED##

Hi all - for the benefit of anyone experiencing this. Change your plugs first. Mine were severely carbon fouled. As soon as I did this, I could get it to idle and then try to make the change to the IAC screw to get it to idle between 600 and 700. it was still a little rough. using the Suzuki software, I ran the fuel injector cut off test. based on that I determined , I had some severely clogged injectors. Ran two 5 gallon tanks of Premium fuel each with 5 oz of seafoam and that appeared to fix it. Spent probably 15 hours troubleshooting all the sensors, which , though educational, was unnecessary. hope this helps anyone with similar problem.

 

[99yam40]

If the injectors were that bad , make sure the screens/filters in the system are also cleaned or replaced.
Injectors can be sent off and serviced also.
they will do a as found test , clean, and then another test and spray pattern check with reports