85 190E 2.3 Won't Go Fast

[Hawaii Mercedes]

Driving Ok then loses speed - limited to 35 mph at times - especially on hills. Once at the top - OK again. Doesn't overheat. This also happens on the flat but less predictable.

Have replaced the following:
Fuel injectors
spark plugs & wires
catalytic converter
distributor
fuel pump

Timing is fine

Have taken it to the dealer - almost ripped off (needed to drop the gas tank to check the fuel lines!) Also another German car repair shop - has seen it. Am about ready to donate to the Kidney Foundation!

:evil: Would appreciate suggestions on what this might be & how to fix it! Aloha, Hawaii Mercedes

 

[Spike]

Have you checked your airfilter...best to check the obvious before spending loads of money.

BTW, what colour are your plugs...you should get an idea whats going on by taking a look at them.

 

[Nostrils]

Hawaii, your problem sounds the same as my car did a couple of years back. The ECU memory module gave up the ghost and I too was limited to about 30mph. On speaking with my mechanic, he said that most ECU will have some sort of 'get you home' mode.

I did question why the car seemed fine upto about 35....He explained from his knowledge it was because if someone were to be on a motorway or fastish road, that they could still drive at a suitable pace until a suitable exit was found.

Good Luck in your enquiries...post back to the board what you find!

Cheers