joeynat
Active LVC Member
I searched and tried some things other members have done but it hasnt worked.
I have 3 problems whether their related I dont know.
1994 Mark VIII 102xxx miles
1. Takes a long time to start whether cold or after driving. During cranking it sounds like shes starving for fuel or like the timings off and when it finally starts the rpms go from barely idling (bucking) to a normal idle.
2. Under WOT (when cold) she bucks like crazy with the rpms jumping up and down in harmony with the bucking. Its much worse when cold but you can feel the lack of power and slight bucking after its warmed up on the highway at WOT. I should mention this only happens under load not while in park.
3. When coasting down the road with no throttle the rpms fluctuate from 45 mph down to 25 mph. Hard enough to rock my head forward and back.
What Ive done in the last year...
New fuel pump and filter
New crank position sensor with pigtail
New camshaft position sensor with pigtail
Pulled out BOC performance chip
New plugs and wires
2 new coil packs
No vacuum leaks
Pulled each wire off the packs when running and the motor sputtered for each one.
There were 3 error codes..... 511 Read only memory (ROM) test failure - KOEO 214 Cylinder Identification circuit failure (in continuous memory) 116 Engine coolant temperature higher or lower than expected (KOER)
These codes are no longer there, removed chip, new camshaft sensor.
I just ordered motorcraft plugs and wires. Everything else i changed was motorcraft except for the pigtails, and current plugs and wires.
Any theories please...
I have 3 problems whether their related I dont know.
1994 Mark VIII 102xxx miles
1. Takes a long time to start whether cold or after driving. During cranking it sounds like shes starving for fuel or like the timings off and when it finally starts the rpms go from barely idling (bucking) to a normal idle.
2. Under WOT (when cold) she bucks like crazy with the rpms jumping up and down in harmony with the bucking. Its much worse when cold but you can feel the lack of power and slight bucking after its warmed up on the highway at WOT. I should mention this only happens under load not while in park.
3. When coasting down the road with no throttle the rpms fluctuate from 45 mph down to 25 mph. Hard enough to rock my head forward and back.
What Ive done in the last year...
New fuel pump and filter
New crank position sensor with pigtail
New camshaft position sensor with pigtail
Pulled out BOC performance chip
New plugs and wires
2 new coil packs
No vacuum leaks
Pulled each wire off the packs when running and the motor sputtered for each one.
There were 3 error codes..... 511 Read only memory (ROM) test failure - KOEO 214 Cylinder Identification circuit failure (in continuous memory) 116 Engine coolant temperature higher or lower than expected (KOER)
These codes are no longer there, removed chip, new camshaft sensor.
I just ordered motorcraft plugs and wires. Everything else i changed was motorcraft except for the pigtails, and current plugs and wires.
Any theories please...