OK... where to start, i recently installed a replacement engine into my '95 Ghibli. The transplant went smoothly, the car worked perfectly for 3 days and approx 80kms, it had excellent power.
Then, when i was driving the engine started to have an intermittent stumble / hesitation / slight backfire / low on power like an ignition issue or not firing on all cylinders.
When taking the car home, the engine cleared on two or 3 occasions back to normal, but would then would go back to the same symptoms.
Now that car will still start but has a low idle, smells rich, stumbles when revving.
So far i have done the following:
Next ideas to try.... any suggestions?
I have the car booked in next Wednesday for an inspection but i want to keep going to see if i can sort it out on my own as fault finding can get very $$$$!!!
Cheers! Mike
Then, when i was driving the engine started to have an intermittent stumble / hesitation / slight backfire / low on power like an ignition issue or not firing on all cylinders.
When taking the car home, the engine cleared on two or 3 occasions back to normal, but would then would go back to the same symptoms.
Now that car will still start but has a low idle, smells rich, stumbles when revving.
So far i have done the following:
- I swapped over the 5 relays from the other side of the engine bay, cleaned and checked all sensor connections are tight, cleaned and checked fuse box.
- I checked all crank / cam sensor air gaps and adjusted shims to .6mm as specified.
- I checked crank and cam sensors with multimeter - all read 700 ohm
- I checked all coil packs, all read 700 ohm
- I then removed all spark plugs: Cylinder bank 1-3 are all even colour - slightly lean / grey but look OK, however cylinder bank 4-6 are all even colour but appear more black / rich - so for some reason this bank is running rich.
- I ohm test air intake sensors cold and hot, one sensor reads OK, the other is faulty, replaced sensor, no change.
- I ohm test water sensors - cold then in hot water - both read OK
- I replaced both Lamda sensors with new sensors, no change.
- I removed and cleaned MAP sensors with contact cleaner - tested ohms OK, although i have not yet tested to see if the MAP sensors hold pressure...
Next ideas to try.... any suggestions?
- I have not checked throttle position sensor - i will check this tonight, i will test resistance when manually opening the throttle? Could this cause this type of symptom?
- I have not tested fuel pressure reg / fuel pump / fuel filter or injectors - although does not explain why one bank has a different mixture to the other.
- I have not removed plenum to check for cracks (although unlikely vacuum related as symptoms were initially intermittent.
- I haven't done a compression test yet but i'm leaing towards a sensor issue or perhaps an ECU fault?
I have the car booked in next Wednesday for an inspection but i want to keep going to see if i can sort it out on my own as fault finding can get very $$$$!!!
Cheers! Mike