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Mercedes - 1971 Mercedes 250
Expert: Robert - 11/6/2009
Question
I have a 1971 Mercedes 250 that has a hesitation when taking off, I can't seem to get rid of. Fuel pump was replaced along with filter and lines cleaned. Gas tank was removed and reconditioned. New plugs and wires, I also use a premium fuel. Service records from previous owner indicates past history of this, but Mercedes Dealership never found problem. This car was serviced by an authorized Mercedes Dealer. I did switch to a single exhaust but hesitation was present with dual pipes. What do I check next?
Answer
Steve,
It sounds like a broken timing advance. Or a vacuum leak on the advance diaphragm. Find an independent shop that has a sun diagnostic machine with scope or equivalent.
If the vehicle has catalytic converter it may be clogged. This would not allow full acceleration.
Good Luck
Rob
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