my sprinter 413 van 03 ocasionaly goes into limp mode ,no warning lights on , but will corect itself when turned off for a while , diagnostic doesent show any fault , any ideas ,, thanks,,

egr valve or hole in intercooler/boost pipework would be my bet.

If the ECU realizes that there is a fault and goes into limp mode then it will log a fault code.

If you do enough drive cycles after this without the fault occurring then it may erase the code from its memory.

There may be a fault that causes reduced power that the ECU doesn't recognise as a fault and doesn't log a fault. These are more tricky to sort out and where advice from the internet make owners looking for a supposedly quick solution throw parts at it based on peoples guesses.

There are hundreds of possible causes, without proper diagnosis you may get lucky and get it right first time, but equally I've seen times when people have thrown thousands at it without sorting the issue.

As said, faults should be logged even if they are 'pending'. Check for intercooler hoses sucking themselves flat or delaminating internally.

As above really. Ideally you'd want to do a scan just as its gone into Limp as this is obviously your best chance to read a code 'if' it is managing to clear itself. How long did you leave it between the issue and then scanning previously?

Have you had the memory read with a ODB2 reader there should be a Fault code in there

[Edited on 11/7/14 by Trollyjack]

turbo i had one that done this and the vains in the turbo were sticking

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Originally posted by JAMSTER
turbo i had one that done this and the vains in the turbo were sticking

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Sticking turbo, actuators, split pipes and burst intercoolers will give poor performance but should set codes for boost pressure deviation. You will normally be able to hear boost pressure leaks as you drive.

Depending on whether it is Euro4 or Euro5 emissions spec it may be possible for an EGR valve to stick and not give codes. Euro 5 requires feedback of EGR valve position.