savagephil
New member
hi ...thanks for this much needed thread- my sprinter predictably goes into limp home mode (2000rpm,70km/h)..and I'm over it! any thoughts very welcome.
On the last day of a 4000 mile trip my 2006 SMB conversion T1N went into LHM going up the grade toward Donner Pass. We limped home and I did some research and it turned out to be a broken plastic Turbo resonator.,Replaced it with a metal part and have had no problems since.I'm trying to get my head around what consitutes LHM. I know, or think I know, that there are different levels of LHM. The transmission only allowing 2nd gear and reverse operation is the most severe level. One of the questions is often whether the computer(s) have set LHM or if it is just a regular old component failure causing a regular old lack of power.
Some recent discussion got me thinking that there may be simple check to determine if you are having a computer set LHM incident.
"Emergency Running Mode" limits to 3200 RPM. That must be "Limp-in Mode" or "Limp Home Mode" as I've seen the various descriptors used even in MB "official" publications.
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So-o-o, I'd like to start an incident log in the form of this thread. It may not be the best method, but unless someone comes up with a better idea this is what we got.
Should you experience a lack of power please try raising the engine speed before you shut down the engine. If the engine will not go above about 3200 RPM, you are most likely in a computer set LHM. If the engine readily goes above that RPM you are most likely not in a LHM mode. After you determine whether you actually were in LHM or not, and you resolve your problem(s), please post what you found here.
A description of symptoms, DTC's found, etc. would be very helpful. Please don't clutter up this thread by asking questions specific to your present problems.
By the way. A problem with the Fuel Rail Pressure Sensor may limit to 2800 RPM. The difference between 2800 and 3200 RPM should be noted when doing the engine speed test.
We'll see how this thread progresses. Maybe it will just die quietly. vic
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Also while revving the engine to listen out for air leaks from hoses I noticed that the engine won't rev past about 2700rpm. Is this usual sprinter behaviour or is it in some kind of limp mode without any lights to tell me so? I drive a tran**** at work and that revs to the redline and is much newer so I thought that was odd.
Thanks goes to Cheyenne Keith for the input.For info my 2.2 127 HP (313 CDi) will also not rev past 2,700 rpm in Neutral. I believe it is some sort of safety device. I think you have to press the clutch to bypass it?
Keith.