Date registered: Nov 2004
Location: Gloucestershire, England
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Fuel distributor pressure, hesitation
The car is a 190e 16v on which I have rebuilt the top end. It now has plenty of pull throughout the rev range, however unfortunately there is a hesitation in this. When you floor the throttle it hesitates a bit, then shoots off.
I am thinking it might need a new fuel distributor. Perhaps the plunger inside is sticky and so can't respond to the quick demand for fuel? What are the symptoms of a failing distributor? I have checked and it doesn't seem to leak fuel into the intake under the throttle butterfly. Is there any way to test the plunger. The air flow sensor seems to sit correctly. Starting and idling is 99% fine, occasionally it will stall (more likely when engine hot) but always starts rigth away even in the cold.
Also if I can get a mechanic to test fuel pressure/control pressure, will that help? We looked at the plugs after some hard driving and it's not running lean or rich. Idle mixture is good. Just the hesitation..