Bypass limp mode

[Andrew Rymer]

Hi All,

Had enough of this car now so what I am after is a way to bypass the limp mode. Anyone got any ideas?

Cheers,

Andrew

 

[BlackC55]

Whats the problem?

 

[Andrew Rymer]

Hi BlackC55

Secondary air induction malfunction. I have been to MB Liverpool 5 or6 times, then a recommended Indie 4/5 times. All saying that various bits need replacing. I have had just about every ****** part in the secondary air induction side changed only to be told it "could" be the supercharger bypass valve. Now although I like the car I cant justify the cost of replacing every ****** component just because a computer tells the user that it "might" or "could" be a part. If you look at my threads you will see this has been going on for a year. The cost of the supercharger valve is £540.00 pus vat!!!! That will mean I have spent in the region of £1800.00 just to get it out of limp mode. It did rectify itself one weekend but is now in limp again.

I really am at the limit with this car.

Regards

Andrew

 

[BlackC55]

I can get those valves a bit cheaper.

What is the part number?

can I suggest that the people that have looked at it may not know or understand the engines systems possibly?

 

[HERBIEMERCMAN]

hi andrew, i know how you feel, i know there is a list as long as your arm with things that cause "limp home", it is even in the merc handbook, which says a lot about merc's confidence in their multiswithching, oil leaking, maf sensing, oil leveling, low battery,cold weather, speed sensor, selector setting, loose connections, lack of oil changes autoboxes. it's the achiles heel of the mercs. the problem is we use them for years and thousands of miles but when they get older the variety of problems of possibilities and the level of expertise ( if honest ) available makes you forget the good life you have had with the car. the cheque book owners or company car owners who get them from new don't have a problem, later in the car's life the complexity and possibility for malfunction is only for the massachistic owner. i know because i am one. there are several owners who try to help, malcolm, etc, but at the end of the day an old merc is a nightmare, it is so complicated and at a certain age you will always be fixing it and looking for help. just read the postings on this site and then make your own mind up. herbiemercman.

 

[No1Vic]

Air recirculating valve

Hi Andrew, did you get a chance to pull your valve apart? Just curious as when I did mine nothing looked damaged or worn. I have also read somewhere that for example after a flat battery or maybe the car being disconnected from the battery the valve has to 'learn' or be 'learnt' it's settings. Question for the experts, does this mean the valve will learn it's settings on it's own or does it need to be 'calibrated' with for example a 'Star' system?

 

[kenneth]

Hi Andrew, not sure if you saw my thread, but seem to be having similar problem, I'll paste it here;

Experiencing power loss on my 2001 clk 200k (manual, 86k miles). Happens in no particular sequence, just start up, hot or cold and power gone, feels like minus 50bhp (throughout entire range). No umph, like the kompressor is not working. The engine management light may come on after a few days but increasingly does not. When put on a code reader it has shown p0410 (Secondary air injection) p2036 (air flow is too low) also has shown 2015 s40/3 (clutch pedal switch fault) 2039-16 (recirculating air flap actuator (16) comparative error actual valve potentiometer). Whew!
Whenever we reset the system everything works perfectly, sometimes for a month, sometimes two weeks sometimes for a day.
To date with two mechanics have replaced, Air mass meter, secondary air valve, new platinum sparks and carbon filter. Starting to get expensive and no end in sight.
Seem to remember problem starting after reversing my exhaust into low wall causing it to drop off its bushings to ground. Mechanic (2) whacked it back in place and I wonder if that could have damaged something in there? Is that where the 02 (lambda) sensors are? Could it cause the kompressor to jam?
Reset the system again yesterday, again no dash light but read code po410 secondary air injection, air flow is too low p2036, reset and power back. Has recently shown code po244 Kompressor solenoid, which seems to point in the correct direction?
Any ideas?
Thanks
Since then have had full diagnostic done at main dealer and they say the air flap actuator needs replacing, at a cost of around €600. If that fixed it I would grin and bear it but I'm not convinced nor is my Indie mechanic. Getting v. fed up now. Like yourself really like the car otherwise.
Have you replaced the MAF? Some threads point to this, how about the O2 sensors?
Best
Ken

 

[Andrew Rymer]

Hi Kenneth
Sorry I have not got back to you sooner. No1Vic has come up with some interesting ideas and I wait with baited breath asto the outcome of his O2 sensor thread. I have had the MAF replaced twice now in the same year using very expensive genuine merc parts. It seems to be a guessing game by either indie or merc people. Never had such trouble that cannot be properly diagnosed on any other car I have had including Jags, BMW's, Audi's, Fords, Vauxhalls to name but a few. Come to think of it.....I have never had to pay any more than £80.00 for any single part (aluminium sump BMW 318is). All the cars I have had have been slightly older with some more and some less mileage. Mercedes have really lost the plot. Still not sure what to do with mine......been advised to cut my losses and buy a different car altogether and scrap this one. Will not be getting another merc ever!!!!!!

 

[kenneth]

Hi Andrew, will have a look out for that also (Vic01) am going to try a few more things before I throw in the towel.
Best
Ken

 

[MB TECH WARRINGTON]

Hi BlackC55

Secondary air induction malfunction. I have been to MB Liverpool 5 or6 times, then a recommended Indie 4/5 times. All saying that various bits need replacing. I have had just about every ****** part in the secondary air induction side changed only to be told it "could" be the supercharger bypass valve. Now although I like the car I cant justify the cost of replacing every ****** component just because a computer tells the user that it "might" or "could" be a part. If you look at my threads you will see this has been going on for a year. The cost of the supercharger valve is £540.00 pus vat!!!! That will mean I have spent in the region of £1800.00 just to get it out of limp mode. It did rectify itself one weekend but is now in limp again.

I really am at the limit with this car.

Regards

Andrew

hi andrew, sounds like you could have oil in your inlet system, there is a filter before the secondary air injection valve which also blocks up,
have they checked your ecu and other various components for oil which can be caused by faulty camshaft magnet, which causes oil to leak into the wiring loom,

which specialist was it you took it to?

 

[MB TECH WARRINGTON]

just checked through your previous posts, looking at what you say you have had replaced, sounds as though when mb replaced your magnet, starter line, (due to leaking oil) oil had previously contaminated your loom,

they did not replace the loom which may be full of oil.

if you bring your car to us with a list of whart has been replaced to date we will find the fault causing you these problems.

if you have oil in the loom it can cause airmass issues which can cause the supercharger to seem faulty.

we have experienced these faults many times and rectified the fault

 

[Andrew Rymer]

Hi MBTech

I will ring you and arrange to come and see you soon. Strangely, this morning the car has gone out of limp mode and is performing as it should!!! The engine management light is still on. Now I was under the impression that only a star diagnostic machine could reset a fault like that but maybe wrong. I will give you a ring in the next few days.

 

[television]

Hi MBTech

I will ring you and arrange to come and see you soon. Strangely, this morning the car has gone out of limp mode and is performing as it should!!! The engine management light is still on. Now I was under the impression that only a star diagnostic machine could reset a fault like that but maybe wrong. I will give you a ring in the next few days.

Once any oil has stopped leaking out of the wiring, then the O2 sensor will burn itself clean, and the engine will be out of the limp home mode, then only the fault code to remove

 

[Andrew Rymer]

Thanks Malcolm

Lets hope!!!!

Regards

Andrew

 

[Andrew Rymer]

Hi

This ****** car has gone back into limp mode again this morning after a week of having full power. And to cap it all the Brake Assyst warning has come on telling me to visit workshop!!!! Will take this car up to MBTech in Warrington and see if they can sort it out. Will keep you posted as to progress.

Regards

Andrew

 

[foof1]

Hi Andy

Will be going up to MBTech later in the week. I think you will have to pay a visit!! If the car is off the road for any length of time, you can use my C280. Will speak to you later.
YES ENOUGH IS ENOUGH!!!!

 

[Andrew Rymer]

Thanks Freddie

MBTech will probably need the car for a couple of days. I am taking it up a week on Thursday for them to have a look at and then depending on the outcome will book it in. Will take you up on that Freddie if you are around. The Golf V5 is going to be avaliable next week aswell so I will go and test drive that. Thanks for that mate see you this Thursday when you are back.

Cheers

Andrew