Nissan Skyline

[gdp260860]

HELP! I have a 1990 RD30 Skyline using excesive fuel $60 for 50ks. Have had it to an auto electrican and a good mechanic but they are unable to find the fault. No faults on the computer and computer has been sent away its OK. They have changed many of the sensors, the problem is still there. It started to play up 12 months ago having more good days than bad. It has gradually got worse, top speed now 40ks, blows heaps of black smoke now at the stage of being almost not drivable. I would appreciate any one ideas.

[GMMAD]

what sensors have you replaced?
02's, AFM?

[sleeper]

Blocked cat?

[bok1]

neighbour stealing your petrol while you sleep?

[HSV271]

Black smoke under acceleration + excessive fuel use = Stuffed injectors/Fuel pump pressure/regulator issues.

Aslo you would probably have fouled the pluggs. :yep:

Good luck...

[gdp260860]

[QUOTE=gdp260860;65637]HELP! I have a 1990 RD30 Skyline using excesive fuel $60 for 50ks. Have had it to an auto electrican and a good mechanic but they are unable to find the fault. No faults on the computer and computer has been sent away its OK. They have changed many of the sensors, the problem is still there. It started to play up 12 months ago having more good days than bad. It has gradually got worse, top speed now 40ks, blows heaps of black smoke now at the stage of being almost not drivable. I would appreciate any ideas. I have changed the Air flow meter, water temperature sensor and pressure regulator control solenoid valve. Fuel pump pressure/flow checks out OK.

[GMMAD]

have you checked afm voltages?
checked for leaking injectors?