Randy Gibson
New Member
Hello Folks,
I need some advice, I am at a point where I am not sure where to attack next.
1987 Bertone X, fuel Inj. Was hard to start, but would get there and Idle OK, but rough. I decided first to replace plugs, wires, rotor, cap, coil, coil resistor and O2 sensor. No real noticeable change. I then adjusted the valves to spec. Better, but not good enough, so I then replaced all 4 injectors with rebuilt OEM and also re-spliced the harnesses at all the injectors with easier to remove connectors. I have never been able to get it to start again after the injector swap. It coughs at points like it wants to go, but either floods, starves or does something else that talks it out of going.
Ok, so here is what I do know:
1. All 4 injectors appear to fire as designed.....I think. I tested this by removing the injector(s) from their mount and cranked the ignition. A tiny amount of fuel is expelled from each unless I manually push open the mass air flow gate, at which point they fire more fuel - but again, only a nominal amount at ignition until the air flow sensor gate is held open.
2. The cold start valve is operational as intended. It fires during ignition startup when the engine is cold for about 8 seconds.
3. Timing marks on the cam wheel, flywheel and main pulley are all lined up as they are supposed to, rotor pointing to #4 when everything aligned. No doubt ignition is NOT timed properly at this point, as I have been slightly moving the rotor left or right as I turn it over hoping to get it to catch, however, even so I am not significantly far out to time.
4. Spark is present at all 4 plugs, but it is quite possibly weak spark. I am not sure how to test spark intensity. Voltage across the coil is 12v straight, and 9v with the ballast resistor. The plugs being new, still look good and clean.
5. I followed the troubleshooting guide for "starter runs, engine will not start", and everything checks out through step 19, at which point which it says replace control unit. I am not sure I buy that, but then again, that's why I am where I am at this point, asking for suggestions.
Thank you for reading.
Randy
I need some advice, I am at a point where I am not sure where to attack next.
1987 Bertone X, fuel Inj. Was hard to start, but would get there and Idle OK, but rough. I decided first to replace plugs, wires, rotor, cap, coil, coil resistor and O2 sensor. No real noticeable change. I then adjusted the valves to spec. Better, but not good enough, so I then replaced all 4 injectors with rebuilt OEM and also re-spliced the harnesses at all the injectors with easier to remove connectors. I have never been able to get it to start again after the injector swap. It coughs at points like it wants to go, but either floods, starves or does something else that talks it out of going.
Ok, so here is what I do know:
1. All 4 injectors appear to fire as designed.....I think. I tested this by removing the injector(s) from their mount and cranked the ignition. A tiny amount of fuel is expelled from each unless I manually push open the mass air flow gate, at which point they fire more fuel - but again, only a nominal amount at ignition until the air flow sensor gate is held open.
2. The cold start valve is operational as intended. It fires during ignition startup when the engine is cold for about 8 seconds.
3. Timing marks on the cam wheel, flywheel and main pulley are all lined up as they are supposed to, rotor pointing to #4 when everything aligned. No doubt ignition is NOT timed properly at this point, as I have been slightly moving the rotor left or right as I turn it over hoping to get it to catch, however, even so I am not significantly far out to time.
4. Spark is present at all 4 plugs, but it is quite possibly weak spark. I am not sure how to test spark intensity. Voltage across the coil is 12v straight, and 9v with the ballast resistor. The plugs being new, still look good and clean.
5. I followed the troubleshooting guide for "starter runs, engine will not start", and everything checks out through step 19, at which point which it says replace control unit. I am not sure I buy that, but then again, that's why I am where I am at this point, asking for suggestions.
Thank you for reading.
Randy