fluctuation

The problem I am getting when the car is up to temperature about 87c after a while it drops to 80c after a short time it goes back to 87c then back to 80c and so on it never goes past the normal temp It's a 2014 c class w204 Does any one know what the problem could be? Many thanks john

As you can see from the following video, there is a very small amount of fluctuation on my rev tachometer when idling. https://www.dropbox.com/s/unwpqkoj9ebcagh/Video%2004-12-2014%2020%2047%2033.mov?dl=0 Any ideas on this? Only other notable problem is slight rattle/vibration as revs...

Hello . I have a W211 E270 2003 and when temperatures are negative as soon as I start the car i have a fluctuation at idle for about 10 seconds. It`s not a big fluctuation.... between 800 and 820 rpm after which it stabilizes at 800 and when it warms fixed drops to 780 . Do you think it`s a...

Petrol 3.5 engine with 722.9 7 speed gearbox, Dec 2007 build. Noticed last night when on a gentle motorway run to pick up some friends from the airport that I have an issue with fluctuating rpm. I was on cruise at 55mph as I was running a bit early and noticed the rpm was fluctuating by up...

Hi All, Last week I bought a 123 300d. Reasonable miles at 233k – you could say around twenty per day! The car drove fine the 220 miles home, (70/80), used no oil – a little noisy on start-up, valves to adjust and a purge due, etc. Oil pressure quickly up to max, only dropped to just below two...

I had a suspicion that my 6yr old W211 E240 engine speed was fluctuating very slightly from time to time. I could hear a very slight change in engine note. On a long gentle 40mph incline yterday I spotted it happening on the rev counter - the needle gently fluctuated (wobble?) a couple of times...

I've been encouraged to start a new thread with an issue I'm having.. might be similar to ones I've found in other searches but not quite sure so thought to get some your opinions... When I am idling in drive gear (never happens in neutral), there is the slightest hint that the engine idle rpm...

Ok this is a wierd one was wondering if anyone else had this problem. I have a 2.0l 190e and when in traffic the idle revs are at 2000rpm if I tap the accelorator they go back to normal and this only seems to happen in traffic when crawling along, when driving normally its fine when I stop, any...