View Full Version : Need Some help with EFI Kohler PLEASEE!!

05-28-2010, 11:21 PM
I just purchased a leftover 2009 turf tiger 61 with the 31hp EFI kohler. I was testing it out on my lawn tonight and the check engine or service light kept coming on then going back off again. I have no idea what can cause this light to come on? Only thing I have done is put fuel in it, but I use our fuel at the farm which has been sitting around for awhile. Should I be running a higher octane in this engine? It seems to be running great no complaints there just worried about it since this is the first day I have had it. Thanks for any help

05-29-2010, 01:00 AM
87 octane should be fine.

Check all the connections in the wiring harness first.

Richard Martin
05-29-2010, 04:59 AM
Check and see if there are any fault codes present.

1. Start with the key switch off.
2. Turn the key switch on-off-on-off-on, leaving it
on in the third sequence. The time between
sequences must be less than 2.5 seconds.
3. Any stored fault codes will then be displayed as a
series of MIL blinks (from 2 to 6) representing the
first digit, followed by a pause, and another series
of blinks (from 1 to 6) for the second digit (see
Figure 5B-40).
a. It’s a good idea to write down the codes as
they appear, as they may not be in numerical
b. Code 61 will always be the last code
displayed, indicating the end of code
transmission. If code 61 appears immediately,
no other fault codes are present.

Post any fault codes you are getting and I'll tell you what it is or you can download the 28 EFI manual from www.kohlerengines.com

05-29-2010, 10:37 AM
Great response Richard.

I didn't know that you could do that on these. We used to have to jumper the old ECM to get them to code flash.

05-29-2010, 11:30 PM
Thanks you so much everyone, the key thing is great I never knew you could do that. So I did it and it threw code 34 which is maximum or minimum adaption limit reached. When I looked it up it said it could be caused by fuel so I went and got some fuel conditioner for it and mowed two lawns. After this I went and put 7 gallons of 93 octane in it. Sad to say it was still doing it when I got done tonight : ( I checked the codes again today and it gave me 34 and 31. So I unplugged the battery and 31 hasnt come back yet. Im sure it could be multiple things and no certain way to tell what is causing this but any ideas? Im not really sure how strong this mower is suppose to feel since it has been like this since the first time i have mowed with it but I think she is not up to par.

Richard Martin
05-30-2010, 04:38 AM
Just because the 31 disappeared after you disconnected the battery doesn't mean it's not the cause. When you disconnected the battery you dumped the KAM or Keep Alive Memory. The fault would still be there it's just not showing up yet.

I would replace the O≤ sensor first and go from there.

05-31-2010, 01:29 AM
Thanks a lot richard you have been very helpful. I will try that the next rain day I have, hopefully it works. Do you know much about that code could that be affecting my engines performance, or just messing with the computer?

Richard Martin
05-31-2010, 08:41 AM
Thanks a lot richard you have been very helpful. I will try that the next rain day I have, hopefully it works. Do you know much about that code could that be affecting my engines performance, or just messing with the computer?

If the computer stops looking at the sensors (which is the case here) then it resorts to using preprogrammed stratagies to run the engine. This is certainly not optimal under any circumstance.

The beauty of electronic fuel injection is it can adapt to varrying conditions. Heat, cold, air pressure increases and decreases and wear of the engine and hardware. These are some of the things the computer can adjust for. It obviously does this by getting feedback from the various sensors on the engine. If you remove input from those sensors the computer is basically flying blind and can't adjust for anything.

05-31-2010, 11:49 AM
Closed Loop vs. Open Loop
Finally, there are two forms of internal control for fuel injection systems. The most common method uses a special component called a Lambda (or O2) sensor, which permits the system to compare the amount of oxygen in the exhaust with the amount in the outside air, and then signal the computer telling it to adjust the fuel mixture. This is called "Closed Loop," and most fuel injection systems are this type. There are however still many motorcycles and other recreational vehicles that are of the Open Loop design, which is simply a system which does not have an O2 sensor.


05-31-2010, 11:50 AM

06-03-2010, 11:20 PM
So I havent had time to go and get my mower looked at yet, but the light hasnt come on in the last two days and is no longer flashing a code. Is is possible that it has fixed its self or was some kind of glitch? Or does the computer eventually just quit looking at the sensors or something. I dont want to take it in and not have it flashing a code and them telling me nothing is wrong. The problem I am having is I have nothing to compare it against either, I was expecting more power from this 31 horse motor in comparison to my old 25 horse kohler. I dont feel that it has enough power, I mean I mow a lot of over grown lawns and what not so Im not sure if I am just expecting too much from this engine or if its not running right. If this is all its got I think I want to trade it in for a 35 horse briggs. What do you think? By the way cant afford a big diesel so thats out of the question. Has anyone else have this mower with this engine? What is your thoughts on the setup? Thanks

Richard Martin
06-04-2010, 04:34 AM
I have a Kohler 28 EFI. So far mine has been super reliable. I have 1125 hours on it. I had a Kohler 25 before. The 28 is just a 25 with EFI. My 28 only seems to have a tick more power than my 25 had. It is smoother and starts a whole lot easier though.

Have EFI systems ever just "fixed themselves"? Absolutely. The computer never stops looking at the sensors unless it finds a problem with one. Even then it is only ignoring the data it gets from the sensors. It still looks at the sensors to see if they correct themselves. The computer can scan all of the sensors, analyze the data and make a determination as to what it wants the engine to do in excess of 60 times a second.

06-04-2010, 08:36 AM
Up here there were numerous issues with the efi's and the fuel in the spring. With the quick warm up the gas had a lot of water in it. It was messing up ALOT of fuel pumps on efi's. My dealer called Kohler about it. At one point he had 6 walkers with all bad fuel pumps. Mine didn't go though. He gave me a gas treatment to run in it till summer months came. That could be the problem.

06-04-2010, 02:46 PM
it was the old gas you shoved through it.

your fine. those efi's are tough

Two Seasons
06-04-2010, 06:54 PM
it was the old gas you shoved through it.

your fine. those efi's are tough

Agree with Cboy7. Continue to run 93 octane and you'll be fine. All 93 octane for us, even in the handhelds.