300GE Performance Problem
 

I have a 1990 300GE. Taking off from a dead stop the truck chokes, struggles to pick up speed but once it gets going it seems to be fine until I come to a stop and have to take off again. If I am on even a small hill it is almost impossible to take off sometimes I have to engage the low 4x4 to move along, and it gets worst if I have the A/C on. Standing still if I floor the accelerator it misses and sometimes backfires. I have either replaced (new) or tried the following parts from another 300GE in good running condition:both fuel pumps, fuel accumulator, fuel distributor and fuel pressure differential attched to it, injectors, fuel pressure regulator at return line, crank position sensor, coolant sensor, ignition module, ignition coil and wires, distributor cap and rotor, electronic control module but to no avail. I don't know what else to do. At this point I am thinking about a switch to diesel engine. Any help will be appreciated.

Thank you

Hate to state the obvious but did you try new plugs, the 103 engine doesn't like platinum plugs just the good old Bosch non resistor.
Good luck :)

Hi,
Yes I have several times, and I am using what Mercedes Benz calls for Bosch H9DCO.

Thanks

OVP relay or fuel pump relay? Have you cleaned all the grounding points, they can create all sorts of problems.Does it rev freely in neutral and only bog out when under load?

300GE Performance Problem
 

When I rev in neutral there is one spot between 1500 and 2000 rpm where the engine misses, if I floor it you can clearly feel the choking and delay in acceleration and sometimes it backfires. Under load its terrible but once it passes 1500 to 2000 RPM spot it is ok. Also cut off everytimes i come to a stop if I don't give it some gas. I already replace the overload protection relay but nothing. I need to try the fuel pump now but I don't have one yet because the 300GE is the only vehicule that uses this relay. Thanks for your feedback.

Tetekale