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Starts fine, idles well, bogs down when turning on PTO.

#1

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bobknowverylittle

Snapper Pro S200xt, 49E877 vanguard engine EFI system. As mentioned, engine bogs down when turning on the PTO. Just started doing that two cuts ago. Turned off engine to check for debris and or bad pulley, they were fine. Started engine again and problem went away, cut grass. Same thing happen again following week, again stop and restarted engine and all worked fine. This week problem has come back and is not going away as before. Plugs have only 28 hrs. , all pulleys were not hot to the touch. Any suggestions on what to check? M.I.L. comes on and then off again, just not getting full throttle when PTO engaged.


#2

S

slomo

bobknowverylittle said:
engine bogs down when turning on the PTO
Click to expand...
I'd look a the PTO and the electrical circuit.
bobknowverylittle said:
M.I.L. comes on and then off again
Click to expand...
What code is it throwing?
bobknowverylittle said:
just not getting full throttle when PTO engaged.
Click to expand...
Need to investigate this.


#3

A

Auto Doc's

The conditions favor a fuel starvation. This usually begins at the fuel tank pickup tube.

The other possibility is one coil or injector has stopped functioning. Usually, it is a failed coil.

Solid mounted v-twin engines do not shake, they just drop the power by half, which is noticed especially when the PTO is activated.


#4

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bobknowverylittle

slomo said:
I'd look a the PTO and the electrical circuit.

What code is it throwing?

Need to investigate this.
Click to expand...


#5

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bobknowverylittle

Don't have any code panel, that i know of. Unless it appears on hour gauge when happening. Went to see if anything on hour gauge and could not get it to fail today? Feel certain it will show up again!


#6

A

Auto Doc's

From what I have studied so far, these have issues with "smart" ignition coils failing. The right side usually fails first, but both coils are recommended to be replaced, especially if it has considerable hours on the machine. These have a warning light that will stay on steady when running or flash a code with just the key turned on.

I have not found a code list anywhere yet.

The first things to do is inspect all wiring and connection really well, then loosen clean and retighten any grounds starting at the battery. Troubleshooting 101, that many overlook.


#7

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bobknowverylittle

Thanks for your input slomo, it is appreciated. The problem is still on and off. Changed fuel filter, main filter, seem to have helped some, also switched fuel tank caps from other side ( never used) I did find an additional filter connected to the fuel tank, but has only hose on one end (part # 84001895) can't find an information on it. Not sure what it is suppose to do.


#8

StarTech

StarTech

That extra filter is just there to dirt out the vent line.

Briggs only has MIL light to indicate a problem. Must use the Briggs & Stratton Diagnostic Tool Kit Cable (Part No. 19636) to pull the codes. And the diagnostics software. Note you must have Win 10 or higher it to work.

Either one of these three manuals cover the Briggs EFI system.

1755632977100.png


#9

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bobknowverylittle

Thanks Star Tech. Can anyone individual order or buy the tool kit? i assume the manuals can be ordered also?


#10

StarTech

StarTech

If I remember correctly only a dealer that has access to the Briggs PowerPortal can download the software itself. Or a tech that is willing to provide a copy of it.

Briggs is even very proud is the hardware...
1755634992691.png


#11

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bobknowverylittle

I had been told that. Thanks again, I will look up manuals to see if i can get one,


#12

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bobknowverylittle

Star Tech, just discovered something strange, there is no accumulation of fuel in new filter. Put gas in other side tank, still same problem. Engine still starts no problem and idles fine. When i full throttle in neutral MIL light comes on for a short period and goes off. When i turn the key on pump runs for a couple of seconds, then stops running. It seems strange that the filter is not full of fuel, correct? Blew air in tank inlet hose and it definitely goes through tank.


#13

Tiger Small Engine

Tiger Small Engine

bobknowverylittle said:
Star Tech, just discovered something strange, there is no accumulation of fuel in new filter. Put gas in other side tank, still same problem. Engine still starts no problem and idles fine. When i full throttle in neutral MIL light comes on for a short period and goes off. When i turn the key on pump runs for a couple of seconds, then stops running. It seems strange that the filter is not full of fuel, correct? Blew air in tank inlet hose and it definitely goes through tank.
Click to expand...
Fuel filters don’t always fill up with fuel. Make sure fuel tank vent and or gas cap is venting properly.


#14

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bobknowverylittle

Will check venting tubes and caps, seems odd both tanks would be doing same, as one has never been used. Thanks.


#15

S

Savage3

bobknowverylittle said:
Star Tech, just discovered something strange, there is no accumulation of fuel in new filter. Put gas in other side tank, still same problem. Engine still starts no problem and idles fine. When i full throttle in neutral MIL light comes on for a short period and goes off. When i turn the key on pump runs for a couple of seconds, then stops running. It seems strange that the filter is not full of fuel, correct? Blew air in tank inlet hose and it definitely goes through tank.
Click to expand...

bobknowverylittle said:
Will check venting tubes and caps, seems odd both tanks would be doing same, as one has never been used. Thanks.
Click to expand...
I would check the coils, sounds like a coil problem to me. Generally speaking, your symptom as described usually indicates a faulty coil.
The engine starts and runs fine. As soon as you start pto or try running up a hill or place the engine under load the engine will bog.

Usually it is only one coil that fails, the engine runs fine on the other coil until under load.


#16

O

Oddjob

One way to tell if you have only one cylinder working is to start it up and spray water on the mufflers. If you have a failing coil, one side will be a lot hotter than the other and will instantly vaporize the water.


#17

R

RevB

bobknowverylittle said:
Snapper Pro S200xt, 49E877 vanguard engine EFI system. As mentioned, engine bogs down when turning on the PTO. Just started doing that two cuts ago. Turned off engine to check for debris and or bad pulley, they were fine. Started engine again and problem went away, cut grass. Same thing happen again following week, again stop and restarted engine and all worked fine. This week problem has come back and is not going away as before. Plugs have only 28 hrs. , all pulleys were not hot to the touch. Any suggestions on what to check? M.I.L. comes on and then off again, just not getting full throttle when PTO engaged.
Click to expand...
3k RPM or more before engagement. How do you define "full throttle" with PTO engaged...


#18

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bobknowverylittle

Excellent idea, simple, smart and much experienced. Main reason i joined this forum. Thanks.


#19

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bobknowverylittle

Thanks to all who responded! It is definingly running on one cylinder. It was hard to tell with it working on and off. But now it is not and easier to diagnose,


#20

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Oddjob

So now swap sparkplugs and see if the good cylinder has switched sides. If so, you have a bad plug. If not, most likely a bad coil.


#21

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bobknowverylittle

Will try tomorrow. Thanks again!


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