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I have an is2100z and lately after mowing about 35-40 minutes it seems lose power. You can hear the engine is bogged down and it slows to a crawl. I let it sit for an hour or so and start the process over. Any insight or thoughts? Thanks

Next time try pulling the choke on very slowly
If that improves the performance then you have a fuel problem
If it makes no difference then you have a valve or ignition problem .

Thanks, but its fuel injected.

ToddN said:

Thanks, but its fuel injected.

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Air, fuel, compression and spark.

Fuel tank with a partial clog.

Ignition coil going bad.

ToddN said:

Thanks, but its fuel injected.

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That's what's fun about new mowers. When fuel injection works its great. When it doesn't it's not so great. From what you describe the engine is good mechanically it probably has an issue with fuel or spark which is controlled by the "box". You have inputs to it and outputs from it. Is it a failing sensor giving incorrect data or is it out putting bad control signals to devices or is an output device failing? Without the proper tools and documentation everything is just a guess. Let us know what the dealer finds.

When it bogs down and loses power does the malfunction indicator light come one or even flicker? If it dows thendoes then there will be DTC logged in the ECM. You can read these code via blink codes as per the attached. Once you have the DTC post them here and I will assist you further.

If the MIL does not illuminate then it is not an EFI issue but a mechanical or fuel supply issue. FIRST thing I'd check, based on what you have described, its the breather for the fuel tanks. This vents to atmosphere via a fuel filter which is hidden behind the engine on the IS2100Z.

Not sure if this mower has a vented tank cap or not. Something to check into though and make sure it's not plugged up

Pete6114 said:

Not sure if this mower has a vented tank cap or not. Something to check into though and make sure it's not plugged up

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The fuel caps are sealed. The Is2100Z has a breather line linking the two tanks which then vents to atmosphere via a 84001895 fuel filter

Well I picked this up yesterday after 5 weeks at the dealer. First they said they couldn't find anything but then said the fuel pressure was on the low end of specs, so they changed the fuel pump. Did not fix it. Then they said the compression was low and they sent the heads to a machine shop to have the valves re-cut. Did not fix it. Then they said the governor was the problem. That seems to have fixed it. I mowed about 4 hours yesterday with no issues.

ToddN said:

Well I picked this up yesterday after 5 weeks at the dealer. First they said they couldn't find anything but then said the fuel pressure was on the low end of specs, so they changed the fuel pump. Did not fix it. Then they said the compression was low and they sent the heads to a machine shop to have the valves re-cut. Did not fix it. Then they said the governor was the problem. That seems to have fixed it. I mowed about 4 hours yesterday with no issues.

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I am glad they resolved it for you.

ToddN said:

Well I picked this up yesterday after 5 weeks at the dealer. First they said they couldn't find anything but then said the fuel pressure was on the low end of specs, so they changed the fuel pump. Did not fix it. Then they said the compression was low and they sent the heads to a machine shop to have the valves re-cut. Did not fix it. Then they said the governor was the problem. That seems to have fixed it. I mowed about 4 hours yesterday with no issues.

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Would be really interesting to know how the govenor slows down after a half hour of mowing. Is it a mechanical govenor or is it part of the engine electronics?

Hammermechanicman said:

Would be really interesting to know how the govenor slows down after a half hour of mowing. Is it a mechanical govenor or is it part of the engine electronics?

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It is a mechanical governor on this engine.

The dealer doesn't seem to have much knowledge of EFI engines, hence they just start replacing items until the machine eventually works rather than diagnosing it correctly.

So the governor setting "story" is just some BS they spun because they don't actually know!

GetTechnicalWithJd said:

It is a mechanical governor on this engine.

The dealer doesn't seem to have much knowledge of EFI engines, hence they just start replacing items until the machine eventually works rather than diagnosing it correctly.

So the governor setting "story" is just some BS they spun because they don't actually know!

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That is what i thought but didn't want to accuse without facts. I run a small one man mower shop and i don't work on fuel injected engines because i don't have the diagnostic tools or the documentation and the return on investment to purchase them is just not there. If you don't have the proper equipment and documentation and a basic grasp of the theory of operation then you are guessing and not troubleshooting.

Hammermechanicman said:

That is what i thought but didn't want to accuse without facts. I run a small one man mower shop and i don't work on fuel injected engines because i don't have the diagnostic tools or the documentation and the return on investment to purchase them is just not there. If you don't have the proper equipment and documentation and a basic grasp of the theory of operation then you are guessing and not troubleshooting.

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I agree. That's why my initial response to @ToddN was simply "I am glad they resolved it for you."

I have been working for a Briggs & Stratton country distributor for over 20 years so I have been blessed to attend a lot of training and we have all the diagnostic tools which does make it a lot easier.
That been said, I very rarely need any of it when I'm diagnosing EFI engines. At the end of the day it is still an engine that requires air, fuel, compression and ignition.. so one should always check the basics first before complicating things. And if its an EFI related issue you can get the DTC from the MIL and start diagnosing the EFI components/system from there.