Raj Morar

Hi Everybody. Please help. I recently purchased a second hand engine for my car (E320 petrol). The engine arrived with a spark plug attached to the plug lead, like the previous owner was checking for spark. I fitted the motor which started up perfectly. It drive smooth under normal driving. The moment you apply load, like up hill, its picks up a severe misfire. No codes and on real time data, it does not pick up any cylinder misfire.
I changed, the plugs, coils, injectors, injector rail, egr, throttle body, air flow sensor and all pneumatics. In fact I changed every part and item above the engine. According to diagnostics, this car is perfect. Why is it misfiring. Please I will appreciate any assistance.

Raj Morar

UPDATE: I just returned from the engineer. Pressure tested both heads. No leaks or cracks. No problems with the valves.

cmriv

but did ya change the coil sparkplug WIRES?

Raj Morar

Sorry. Should have mentioned it. I did change the spark plug wires.