TheLandYacht
New member
Recently (within the last couple of days), I've noticed a new symptom.
Under any acceleration level at all (although more pronounced the more accel you apply), the engine will surge/stall on about a 5sec/2sec cycle. 3 to 5 seconds of surge (feels like acceleration) followed by a couple of seconds of stall (feels like no acceleration applied at all.
The start of each accel surge is accompanied by a reasonable cloud of black smoke (think the cloud you get when you punch it down into passing gear).
Fuel Rail Pressure is ~4000psi at idle, and increases as normal as more pedal is applied, up to about 11000psi at full throttle & 60mph.
MAF readings are around 1.5lbs/min at idle, about 4lbs/min around 30mph, up to around 6 to 8lbs/min at 60mph.
Fresh fuel filter (less than a thousand miles), fresh air filter (last night), recently replaced injection pump & fuel rail (about 3 weeks ago).
This vehicle has about 174,000 miles.
Suggestions?
Under any acceleration level at all (although more pronounced the more accel you apply), the engine will surge/stall on about a 5sec/2sec cycle. 3 to 5 seconds of surge (feels like acceleration) followed by a couple of seconds of stall (feels like no acceleration applied at all.
The start of each accel surge is accompanied by a reasonable cloud of black smoke (think the cloud you get when you punch it down into passing gear).
Fuel Rail Pressure is ~4000psi at idle, and increases as normal as more pedal is applied, up to about 11000psi at full throttle & 60mph.
MAF readings are around 1.5lbs/min at idle, about 4lbs/min around 30mph, up to around 6 to 8lbs/min at 60mph.
Fresh fuel filter (less than a thousand miles), fresh air filter (last night), recently replaced injection pump & fuel rail (about 3 weeks ago).
This vehicle has about 174,000 miles.
Suggestions?