Guest
New member
Model: 924
Engine: 1984cc (non-turbo)Year: 1982
Problem: Won't fire
Hi
I wonder if anyone can help. I recently acquired a 924 and drove it once, but since have been unable to start it: the engine turns over, but doesn't fire. I have checked the following:
Starter Motor: The motor has been tested and cleaned up and cranks the engine at a reasonable speed
Distributor / coil: the plugs are sparking well and the voltages on the coil all check out. The rotor arm on the distributor has been replaced (original cracked) and the HT leads and plugs renewed.
Timing: The timing is correct.
Ignition Control Box (Bosch): All the voltages / resistances check out, and there is no sign inside the unit of any damage / melting etc.
Fuel Pump: The pump is working and fuel is being delivered at high pressure to the distribution unit, from which I infer that the relay is functionning correctly.
Auxiliary Air Valve: The resistance checks out at 30 ohms and air flows freely through the valve when cold.
Cold Sart Injector: Fuel is duly being injected and the plugs are wet after cranking. However, the thermo time switch doesn't seem to be functioning, since the voltage delivered to the cold start injector does not seem to stop even after cranking for more than 10 seconds. The resistance of the thermo time switch checks out at infinite, from which I infer that it's broken. Although this shouldn't prevent the car from firing when cold, I have tried bridging the thermo time switch while cranking and breaking the circuit after 10 seconds, but with no result.
One thought is that the cold start injector is flooding the engine preventing it from firing, but I have tried cranking the engine with the plugs out to clear it and this has made no difference.
Air Inlet Valve: If the rubber pipe is disconnected and the valve is lifted manually with a magnet while cranking, the fuel distribution unit duly engages and injects fuel to each cyinder ( this can be heard happening). This seems correct since the cold start injector should cause the engine to fire which in turn will induce enough vacuum in the air inlet manifold to raise the air valve and thus inject fuel from the distribution unit to the cylinders.
DME: Although I have heard this is a common problem, this car does not seem to have a DME unit
I would be grateful of any suggestions because, to be honest, I have run out of ideas, and would like to get the car going so I can proceed to some bodywork restoration.
Thanks
Will
Engine: 1984cc (non-turbo)Year: 1982
Problem: Won't fire
Hi
I wonder if anyone can help. I recently acquired a 924 and drove it once, but since have been unable to start it: the engine turns over, but doesn't fire. I have checked the following:
Starter Motor: The motor has been tested and cleaned up and cranks the engine at a reasonable speed
Distributor / coil: the plugs are sparking well and the voltages on the coil all check out. The rotor arm on the distributor has been replaced (original cracked) and the HT leads and plugs renewed.
Timing: The timing is correct.
Ignition Control Box (Bosch): All the voltages / resistances check out, and there is no sign inside the unit of any damage / melting etc.
Fuel Pump: The pump is working and fuel is being delivered at high pressure to the distribution unit, from which I infer that the relay is functionning correctly.
Auxiliary Air Valve: The resistance checks out at 30 ohms and air flows freely through the valve when cold.
Cold Sart Injector: Fuel is duly being injected and the plugs are wet after cranking. However, the thermo time switch doesn't seem to be functioning, since the voltage delivered to the cold start injector does not seem to stop even after cranking for more than 10 seconds. The resistance of the thermo time switch checks out at infinite, from which I infer that it's broken. Although this shouldn't prevent the car from firing when cold, I have tried bridging the thermo time switch while cranking and breaking the circuit after 10 seconds, but with no result.
One thought is that the cold start injector is flooding the engine preventing it from firing, but I have tried cranking the engine with the plugs out to clear it and this has made no difference.
Air Inlet Valve: If the rubber pipe is disconnected and the valve is lifted manually with a magnet while cranking, the fuel distribution unit duly engages and injects fuel to each cyinder ( this can be heard happening). This seems correct since the cold start injector should cause the engine to fire which in turn will induce enough vacuum in the air inlet manifold to raise the air valve and thus inject fuel from the distribution unit to the cylinders.
DME: Although I have heard this is a common problem, this car does not seem to have a DME unit
I would be grateful of any suggestions because, to be honest, I have run out of ideas, and would like to get the car going so I can proceed to some bodywork restoration.
Thanks
Will
