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Stop/start will halve the life of your battery, smart charging used on a 2011+Merc`s will only charge the battery up to around 75% under engine power, the rest has to come from energy recuperation if there is any, that`s why stop/start is intermittent especially on short journey`s. The most...

Unfortunately the smart charging system now in most modern cars won`t fully charge the batteries on short journeys. Even when you replace the batteries the problem will reappear if your car is still mainly used for short journeys. To check charging voltage purchase an Ebay cig socket voltage...

Dan ennis, Recently came across this post, did your Merc have stop/start tech?. Regards, Rob.

I have only had one diesel car in over 60 years of driving, a Merc 2004 C-Class sports coupe, bought it new kept it less than a year. Really inspiring when you hit around 5,000 rev`s and the limiter kicks in, bought it for the economy, nothing to do with emissions. From that point on no more...

It appears not many are interested in this subject, they should be as a worn chain can destroy the engine, these single row chains are causing severe engine damage far earlier in vehicles fitted with stop/start technology be aware. Quote Plus, many engines are now using stop-start technology...

I thought I would resurrect this thread as I feel it is important. I have been banging on about this on different forums trying to get the message across. To start an engine you have to overcome the moment of inertia, as mentioned by an earlier poster, this is when the chain comes under...

Quote My om6521 has done 130000 and is running fine although it's not a stop start engine. Never seen the point in those myself. Quote. That`s the information we need, how many cars reach that mileage when stop/start is in regular use, need to be honest here. If this technology is trashing...

Quote On the 271 it's a batch of timing sprockets not made to spec. Quote What years, from when, to when, I thought those soft sprockets were early years, pre 2010.

Found this link on Piston heads, stop/start is mentioned again, most of the high mileage cars that don`t suffer early timing chain problems appear to be pre Blueefficiency stop/start cars. https://www.pistonheads.com/gassing/topic.asp?h=0&f=96&t=1659383&i=20

To add to post above, I believe the chains in the M271 engine don`t break they elongate with wear on the links, the tensioner is then taken to it`s maximum limit and cannot tighten chain, the slack chain rides up the timing gear teeth and wears them down then jumps those worn teeth especially at...

Quote That's the strange thing, I have done timing chains and water pumps on this engine as low as 80,000 miles. Some have been that loud on start up after an oil change that I had feared it would snap. And yet some do much larger miles and have no problems at all. I have wondered if the...

Hi Guys, I am trying to find the cause of early timing chain failures on the M271 cgi engine also known I believe as the M271 evo. This engine is said to have a redesigned chain tensioner but problems with the timing chain/tensioners are now occurring earlier (45,000 miles) than with the...

Hi Guys, I am trying to find the cause of early timing chain failures on the M271 cgi engine also known I believe as the M271 evo. This engine is said to have a redesigned chain tensioner but problems with the timing chain/tensioners are now occurring earlier (45,000 miles) than with the...

quote The 271 engines are affected in the same way even without stop start. quote Some are suggesting the earlier timing chain failures are due to the introduction of the turbo in those M271 engines. If those 651 turbo diesels are failing earlier when fitted with stop/start then this appears...

Quote Though I wouldn't be too concerned with a rattle after a 2 month layover. quote Actually, I didn`t get a rattle after the layup, perhaps it is because I have never activated the stop/start function. Quote It isn't the tensioner that's the problem it's the worn sprockets and chain that...

Engine rattle on cold start, First vid is my car, Dec 2011 1.8 CGI with 41,000 miles and stop/start deactivated, car has been parked for about 2 months, last started 3 days prior to vid. Some owners have posted that after work has been completed they no longer use stop/start, other vids are off...

Thanks Amf Mercedes, Is the engine toast if EML light comes on with rattle (ref to 1.8 cgi 2011+ cars. Rob.

alexanderfoti As specialists can you comment on my (Rob22) post regarding the M271 CGI engine, does this timing chain problem give some warning prior to failure or does it just let go. Rob.

Quote It isn't the tensioner that's the problem it's the worn sprockets and chain that put the tensioner at the limit of its travel. quote This interesting read, As we had described, the CGi motor will show signs of timing components nearing complete failure early enough to get it repaired...

Sorry Guy`s, wrong forum, but good info, as sensor disconnect works on Merc`s and Porsche`s.