Intermittent Power Loss!

[BRABUS R230]

Hi all, I am trying to find out if anybody can shed some light in to the cause of one of my many, and long standing problems, this problem was very, very intermittent at first but seems to have got really bad all of a sudden, I believe its in the list of my problems.
Under brisk acceleration or kick down there is a massive amount of power loss but when driving normally around town all seems to be OK but as soon as I drive on an A Road or Motorway and try to overtake I have very little power, the rev's increase but only up to around 3,500 then (with my foot full to the floor) there is no kick down and the speed increases very slowly, even the engine sounds different! If I pull over and restart the engine then immediately my power is back, restarting the engine always solves the problem, but how long it lasts varies quite vastly sometimes 5 minutes and sometimes up to 1 hour or so!

I have had the charge cooler pump changed and the Air intake temperature sensor changed but the problem still still persists. I am not sure but after searching through the forums I have found that people with problems not to different to mine have found that they have a faulty MAF sensor (Mass Air Flow Sensor) I am not sure if my car has a MAF, MAP sensor or both, I would like to replace my MAF sensor just to exclude this from a possibility of being the cause of my problem. Is this MAF sensor easy to change and where is it located on a SL55 AMG, my car has been plugged in to Star but a fault does not show. Any input would be appreciated.

 

[television]

Yes you do have a MAF and I think it will solve your intermittent power loss, it is in the air intake duct (the 2 big round air intake tubes) 116. Cheapest place is Bosch at £157 or MB at £257 this is as near as I can get to your engine

 

[BRABUS R230]

Power Loss Possible MAF Sensor Fault!

Yes you do have a MAF and I think it will solve your intermittent power loss, it is in the air intake duct (the 2 big round air intake tubes) 116. Cheapest place is Bosch at £157 or MB at £257 this is as near as I can get to your engine

Hi Televsion (Alias YODA), thanks for your speedy reply, do you think I should replace it or may it just need cleaning, I heard that some of these sensors can be cleaned with a electrical special spray switch cleaner! Its not that I am being tight fisted, I was thinking that if I had it cleaned and all was ok the I could save the rest of the money to buy you a drink the next time I see you. Lol......but seriously, I am prepaired to spend the money if it is faulty, actually my warranty company would pay for it, but only if the fault shows up in STAR, should a faulty MAF Sensor always show up in STAR?

 

[television]

I do not know on your engine that well, In this case I would not bother trying to clean it as it is probably going out of spec, this is one of the only things that can give this type of fault, OK one day then a power loss till you switch off and start up again

 

[B1 ECC]

I haven't got an instant answer to your problem, but, if we apply a certain amount of logic, this is how i would look at it. Fault is intermitant and is cured by switching of the ignition and restarting the car, i would now assume that the ecu is "reset" and all functions are normal until the fault comes back, i have a recollection of oil penetrating the wiring loom for the gearbox which sends erroneous signals to the engine management? Maybe the reason the fault doesn't show on Star is because of the reset issue, ideally when you get the fault dont turn it off, have it plugged into Star to see if there's any record. Hope this helps.

 

[television]

The MAF will never show up on STAR, or seldom does, yes the MAF alters the parameters of the engine ECU till you switch off, and re start, very few other things will do that as seen by so many threads on here.

The oil leaking into the gearbox ECU also seldom affects the performance, oil has a infinitive resistance to electronics.

 

[Xtractorfan]

Yes as above.. one way of finding the faulty MAF problem is to connect one of those hand held diagnostic computers into the car and drive it until the fault occurs.....I had to do this after the garage I bought my car from told me they had replaced the MAF (They had done .. with a cheapie) and that it wasnt the problem.... It was a faulty MAF....

 

[BRABUS R230]

Faulty MAF?

I do not know on your engine that well, In this case I would not bother trying to clean it as it is probably going out of spec, this is one of the only things that can give this type of fault, OK one day then a power loss till you switch off and start up again

Do you have any ideas of the part number of the MAF?

 

[BRABUS R230]

I haven't got an instant answer to your problem, but, if we apply a certain amount of logic, this is how i would look at it. Fault is intermitant and is cured by switching of the ignition and restarting the car, i would now assume that the ecu is "reset" and all functions are normal until the fault comes back, i have a recollection of oil penetrating the wiring loom for the gearbox which sends erroneous signals to the engine management? Maybe the reason the fault doesn't show on Star is because of the reset issue, ideally when you get the fault dont turn it off, have it plugged into Star to see if there's any record. Hope this helps.

Thanks B1 ECC for your reply, I did have this problem with the oil leaking from the loom of the gearbox and this problem was sorted sometime ago but it did not seem to affect my driving.

 

[HaydnM]

Do you have any ideas of the part number of the MAF?

Please double check this, as its not clear from Bosch, but I make it to be

113 094 00 48 MB & 0 280 217 810 Bosch.

Please let someone else also confirm, or ring MB Dealer and obtain the number, then I can cross ref for you

 

[BRABUS R230]

Is this it

Please double check this, as its not clear from Bosch, but I make it to be

113 094 00 48 MB & 0 280 217 810 Bosch.

Please let someone else also confirm, or ring MB Dealer and obtain the number, then I can cross ref for you

Thanks

Is this it
http://cgi.ebay.co.uk/NEW-Air-flow-mass-meter-sensor-MERCEDES-E55-AMG-210-074-/280538266290?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4151623ab2

 

[BRABUS R230]

MAF Sensor SL55 AMG £39.99

Cheapest place is Bosch at £157 or MB at £257 this is as near as I can get to your engine

I have found this part for £39.99 with free postage, does this seem to be the part?

http://cgi.ebay.co.uk/NEW-Air-flow-mass-meter-sensor-MERCEDES-E55-AMG-210-074-/280538266290?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4151623ab2

 

[Miffy]

Hiya Cliff, if I was you, I would get the MAF direct from Bosch or MB only, if you get a cheap chinese ebay MAF, it has been known for these to start out being poorly made and may lead you into a false sense of security that the fault can now not be MAF related as you have swapped that out.

 

[BRABUS R230]

Faulty MAF Cheap Replacement!

Hiya Cliff, if I was you, I would get the MAF direct from Bosch or MB only, if you get a cheap chinese ebay MAF, it has been known for these to start out being poorly made and may lead you into a false sense of security that the fault can now not be MAF related as you have swapped that out.

Hey Miffy, thanks for your reply, nice to hear from you. I was thinking that if I purchased this cheap one for £39.99, fitted it, then see if all is ok then if so I can purchase a genuine one rather than spend £270.00 then find out the problem is still there. What do you think?

 

[HaydnM]

Don't buy a cheap one, you making problems worse for yourself if you do

Cheap china copy is not going to help you resolve you problem

 

[television]

As all the above post on it, they are useless, from any Bosch service outlet only, there a centers in every towngo to the dealer locator

http://www.boschautoparts.co.uk/#

 

[BRABUS R230]

As all the above post on it, they are useless, from any Bosch service outlet only, there a centers in every towngo to the dealer locator

http://www.boschautoparts.co.uk/#

Thank you, i have been searching until the early hours of the morning trying to find a genuine Mercedes/Bosch MAF Sensor replacement but without any joy, even the one i found on ebay states is for an E55, I also visited the website called "the maf shop" it shows almost all the mb models including the older R129 SL but not one for the
SL55, i know that you said it has one but seeing as i can't actually find one specifically for my car, is it possible that its part of something else and not a separate item as other models?

 

[HaydnM]

like I said, please double check the number, as Bosch is not making it 100% clear.

As with you, I could find air mass for SL500 AMG & ML55 AMG, But not for SL55 AMG

Now you can see why I ask you to check

 

[television]

The picture I put up was for a SL55 AMG and the 113.992 engine'

 

[BRABUS R230]

Check MAF info

like I said, please double check the number, as Bosch is not making it 100% clear.

As with you, I could find air mass for SL500 AMG & ML55 AMG, But not for SL55 AMG

Now you can see why I ask you to check

Yep, i understand fully, was thinking if removing my one to check the number but not sure of its exact location, Malcom kindly posten a schematic picture but i am not sure if it was spacificly for a SL55 AMG, not knowing how difficult it is going to be locate it, I may need to take it to my MB Stealership!