Ml 270 goes into limp mode intermiitently

did you use the interface to cancel limp mode
you know its in limp mode

what was the printout of the diag

its aok to post i have a problem and this is the issues
but in limp mode you have no choice but too use software too fix the ecu etc to reset the mode fault etc

i think its the cold start system with air has an issue

if the glow plug light is flashing and the glow plugs are ok then its a sensor problem and a needed reset of the mcu to clear the error and retest...

from cold...!!

warm engine is prob aok
something air related

Sounds like you have a speed sensor problem. Possibly input or output shaft speed sensor on transmission. You will need to find out what fault codes are being set and proceed from there.

The ABS system may cause a vehicle to go into limp mode if it is defective. Most times that will happen if your ABS light is lit up on your dash board!

Now if i knew what you meant by blew ?? then i might have a idea --most turbo faults are caused by dirty oil and changing the engine oil every 5000miles with a filter every third oil change will stop this problem .The other problem is the turbine vanes breaking off or being damaged by grit where the air filter is missing or a pipe loose or split allowing the thing to suck in unfiltered air but i do know someone with one of these and he sold it in the end and bought a transit as the turbo gave up quite often ,but without taking the turbo apart then i couldnt tell you why they are failing but i do know he kept a small hand held diagnostic machine in the cab and when it went into limp mode he cleared the codes and off he went again .Seem to remember as well the waste gate operating piston playing up i think a rubber tube perished so it didnt open and the increase in pressure as the engine revved up caused the thing to go into limp mode as too much pressure was being generated ,the rubber tube goes from the pressure side of the turbo to the piston its about 4cms long so as the air pressure builds up it this pressure pushes the piston which opens the waste gate which is a little flap on the exhaust side of the turbo into the exhaust manifold so when it opens it allows the exhaust gas pressure to go straight down the exhaust pipe releaving pressure on the turbo vanes .If the pressure in the inlet side goes too high then a sensor will put the engine into limp mode .Hope you understand this technical jargon ?

It sounds like your 9-3 is in Limp-Home mode. In which case, you are right - it is hitting a temporary limiter. The most typical of the causes I see are from an aging Direct Ignition Cassette (DIC). When there is a fault detected in the DIC module, the throttle body lets the throttle spring kick down to what is known as Limp-Home mode. Although it can be ratcheted back to the normal position, if the DIC misfire is detected again, the same will happen. I'd have a shop take an OBD-II reare to it and confirm. If it is the DIC, replace it, and have them reset the error code and the throttle body.

I hope this get you back on the road quickly with your Saab! (I drive one, too)

There are no cheap answers

You need to have the problems
proper diagnosed at a shop of
your choice

Most vehicles only have 2 or maybe 3
limp or fail safe modes

sounds like mr transmissioin, they suck if you went there go on mrtransmissionsucks.com

When you let up on the gas does it shift? If not it's the govener

Do the old additive method before you give up....................add one and a half cans of `Sea Foam TRANSMISSION TREATMENT' to it and follow directions. Sometimes that can of stuff is AMAZING! don-ohio

One of the thin vacuum pipes must be torn and the minute you go into higher/full boost the ECU doesn't get the requested pressure from the turbo and to protect the tubo from overboosting it puts the car into limp mode, The limp mode only resets when you switch the car off and back on again.

Trace all the thin 6mm vacuum pipes and you will find your leak.