I have a '97 E300 diesel with about 135k miles. When holding fairly constant
speeds of between 35 and 50 mph (with or without cruise control) the engine
surges at about one surge per second. It does not happen at low speeds or at
high speeds. And it does not always do it. At first I thought it might be a
bad batch of diesel, but after 3 refills it still does it. Any suggestions?
This is a non-turbo engine so turbo issues can be eliminated. That
leaves a few possibilities.
Restricted air flow - an obstruction in the engine's air intake or a
dirty air filter.
Transmission: torque converter lock-up feature is locking and releasing,
locking and releasing raising and lowering the engine's speed.
Something with the injection system, but not having knowledge of this
engine I have to leave it at that obviously limp suggestion which could
include a dirty fuel injector.
T.G., your input into this sight is most appreciated. FYI, I had my engine
and the fuel lines on the engine were beginning to crack and leak. Put a new
set on and all is well. BTW, having logged over half a million miles on
300SD engines, I find the performance on the non turbo '97 more than
adequate. I'd buy another.
On a 3-litre it wasn't considered top priority then. Remember there were
sub-2-litre diesels on the old days, too. The rise and rise of diesel fuel
has resulted in significant advances in diesel engines.
For example, I just drove a 1.9-l turbodiesel (on a small Alfa Romeo).
Great acceleration and from inside you'd never know it was a diesel.
For direct contact replace nospam with schmetterling
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.