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Old 10-14-2017, 07:45 AM   #1
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Default Suzuki experts out there df300 1 bank not firing

have a problem that is driving me crazy: my port side df300 is only running on 1 bank of cylinders. 1,3,5 are not firing. have hooked up engine to sds and everything seems normal except I have a map sensor pressure detect port blocked alarm. I guess this would happen running on 3 cylinders anyways.

with the sds cutting ignition or fuel injector to cylinders 1-3-5 has no effect on the engine.

what can cause one side of the engine not to fire? looking at the wiring diagrams all the 12+, grounds for coils as well as fuel injectors go to the same plugs.

thanks for your help
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Old 10-14-2017, 08:54 AM   #2
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I think you might have it backward, the blocked sense port is the cause, not a symptom. I would correct what the diagnostics are telling you is wrong first.

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Old 10-14-2017, 08:59 AM   #3
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compression test the bank that is not firing .
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Old 10-14-2017, 09:28 AM   #4
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Spark, fuel, compression. Figure out which ones you are missing.
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Old 10-14-2017, 01:18 PM   #5
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Quote:
Originally Posted by awalchli View Post
have a problem that is driving me crazy: my port side df300 is only running on 1 bank of cylinders. 1,3,5 are not firing. have hooked up engine to sds and everything seems normal except I have a map sensor pressure detect port blocked alarm. I guess this would happen running on 3 cylinders anyways.

with the sds cutting ignition or fuel injector to cylinders 1-3-5 has no effect on the engine.

what can cause one side of the engine not to fire? looking at the wiring diagrams all the 12+, grounds for coils as well as fuel injectors go to the same plugs.

thanks for your help
I've been fighting the same since a head job on my 250. Shop put 2 wirining harnesses on, traded ECUs. I checked it carefully and it's got spark and injectors are firing and compression is fine. In my case I think it's either the position sensor or it's 180 out of time on that bank.
2 Shops and 3 mechanics have tried.

Shop FINALLY has time Monday to get me in.
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Old 10-15-2017, 10:19 AM   #6
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I have swapped map sensors as well as the eco from the center engine. no change one bank is not firing. have not pulled injectors but would not expect 3 on the same bank to go at the same time, also all the filters look clean and all 3 engines pull from the same tank.

on the sds all the sensors look like they are working correctly.

since the ignition is digital and controlled by the ecu no cdi module I ruled that out by switching ecus.

I will take compression when I get back to the boat.

any other ideas what can affect one bank not to fire: cmp sensor?
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Old 10-16-2017, 05:10 AM   #7
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Quote:
Originally Posted by awalchli View Post
I have swapped map sensors as well as the eco from the center engine. no change one bank is not firing. have not pulled injectors but would not expect 3 on the same bank to go at the same time, also all the filters look clean and all 3 engines pull from the same tank.

on the sds all the sensors look like they are working correctly.

since the ignition is digital and controlled by the ecu no cdi module I ruled that out by switching ecus.

I will take compression when I get back to the boat.

any other ideas what can affect one bank not to fire: cmp sensor?
Its important to know compression like others mentioned, also is there spark on those cylinders? If there is spark and compression then look at fuel system or timing. If no spark then look at ignition system, if sensors were bad you should get an alarm and fault code. Put new plugs in after you do compression just to eliminate that question.
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Old 10-16-2017, 05:56 AM   #8
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Does that model motor have a switch to shut off 3 cylinders when shifting? I had a 1996 Johnson Ocean Runner that did. Switch went bad, motor ran only on 3 cylinders until I disconnected switch.
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Old 10-17-2017, 06:20 AM   #9
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I have not seen any info that the engines have any sort of cylinder deactivation during shifting or for any other reason for that matter.

having someone go take the compression this week and change the plugs as well.

alarms that show ups on the sds are map sensor 2 and etv valve but I think this is all related to the fact that the engine is only running on 1 bank.

when in safe mode does the ecu deactivate cylinders?
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Old 10-17-2017, 08:34 AM   #10
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Does that model motor have a switch to shut off 3 cylinders when shifting? I had a 1996 Johnson Ocean Runner that did. Switch went bad, motor ran only on 3 cylinders until I disconnected switch.
i doubt this has anything to do with the OP issue ,
but i post anyway just for reference ( reference is to DF 250 possibly the same).
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Old 10-18-2017, 02:08 PM   #11
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ok compression is about 20psi difference between the banks so not ideal but not the issue. no spark on one bank and injectors not firing as well. got intermittent spark on one cylinder.
ecu was swapped from center to port same issue.

could a bad stator cause this? thinking either that or bad wiring harness.

thanks,
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Old 10-19-2017, 10:43 AM   #12
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i'm out , but watching and following,
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Old 10-19-2017, 02:20 PM   #13
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Is there a coil per cylinder ? or one per bank? if its not the plugs or the ecu then that leaves coils or harness? really odd, someone must have run into this before.
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Old 10-19-2017, 02:38 PM   #14
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individual coils for each cylinder. need to do some more testing on the wiring harness I know there have been issues with some of them my starboard engine had the harness replaced 2 years ago but was not an issue like this.

I cant get to the boat until sunday but I am out of ideas other than the harness.
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Old 10-20-2017, 10:23 AM   #15
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individual coils for each cylinder. need to do some more testing on the wiring harness I know there have been issues with some of them my starboard engine had the harness replaced 2 years ago but was not an issue like this.

I cant get to the boat until sunday but I am out of ideas other than the harness.
harness can easily be tested without removing it using a multimeter, coils are 3 wires, + to power them up, signal from ECU and a ground , injectors have 2 wires signal and ground , signal from memory is 6v ?.

use caution when testing signal on both coils and injectors, as you can spike the ECU using cheap multimeters

sorry i can't keep my head out of this thread .i am having a hard time trying to work this one out OCD.

there are 2 ground blocks open them up and check for corrosion .
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Old 10-20-2017, 11:56 AM   #16
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will report back as soon as I have something

thanks for the input
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Old 10-20-2017, 05:10 PM   #17
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Originally Posted by Sea-r-cy View Post
Does that model motor have a switch to shut off 3 cylinders when shifting? I had a 1996 Johnson Ocean Runner that did. Switch went bad, motor ran only on 3 cylinders until I disconnected switch.
That's what I'm thinking. Don't know about Zukes but it's a well known issue on others. The reason is to aid in shifting.
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Old 10-22-2017, 11:59 AM   #18
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Please let me know what you find out as I am having this same issue and its driving me nuts!
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Old 10-30-2017, 02:45 PM   #19
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changed harness this morning. engine fired right up no more issues. will go through the old harness when I have some time and see what I find
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Old 10-31-2017, 06:04 AM   #20
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Good news!
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