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1995 E280 Using to much fuel

8K views 13 replies 10 participants last post by  samm 
#1 ·
Hi everybody, i recently purchashed a E280 manual, i brought this manual becouse i heard they dont use that much fuel as an automatic, but im getting like 18 MPG round city and motorway, my automatic E280 used to do at least 25 MPG. The other day i toped up my E280 with 99 octane fuel and done 52 miles on it and it used over half of it. I was shocked, i also changed the Viscus coupling as it was on all of the time, i think something is also wrong, i would appreiciate any help thanks
 
#3 ·
man you think youre getting it bad... my 91 300e is returning about 12-13 mpg! Driving nice and smooth, no heavy acceleration. There is a definite problem.
So I took it to a specialist/independent mech in London (still dishonest and a rip off for a 6 min test, charged whole hour rate)....
Anyway had the hydrocarbon level tested and it was a approx 4800 units. So this proved that a large amount of UNBURNT fuel was leaving the engine. So it roughly calculates that my engine is consuming between 20 to 25% more fuel at the moment.
It is now obvious that this is what is causing a slight hesitation at idle and a considerable lack of response when I put my foot down (kickdown does work).
Im thinking it is either the spark plugs, s plug leads and/or distributor cap and rotor. Although I just had these all changed, they were NOT genuine, except the plugs were bosch. The rest was BERU, a German co but the original stuff is made by Bosch. So Im going to have a good think about it and do a few tests and then possibly go and buy all original parts.

I has been serviced in full, I mean everything changed but if it aint bosch or genuine Merc Im taking it out!!
 
#11 ·
hi mr_benz, i own an e280 auto 1993 and had the same problems as you,
on mine there is a relay behind the battery called the, over, voltage, protection, relay, or in short o.v.p.r, its about 3,inch high with a fuse on top there about £74.00 from your main dealer, after i changed mine i started getting 25-28 around town 30-35 m-ways, i hope this helps,
 
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