- Joined
- Mar 1, 2004
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A letter I received today....
I don't know if you can think of a common fault that would cause my son's 1995 3.9 V8 Discovery to fail to start. We have tried everything we can think of (including borrowing a Testbook system) to cure the fault(s). If we add a jump battery and really crank it over and over eventually it will start and run, but the CO reading is too high (2%approx) and it runs "lumpy". We have tried new plugs, rotor arm, distributor cap, ignition module, fuel filter, checked fuel pressure, checked the ignition timing, checked for air leaks all around the intake and even tried a new filler cap. Without the jump battery the engine will crank ok, but usually fires once or twice then refuses to start. We suspect from the readings on Testbook that the injector opening times of 2 to 3 milliseconds means the engine is overfuelling and flooding the spark plugs. The local Landrover agent here in the uk had the car for weeks, fitted a new coolant temperature sender they said was faulty, and then said it needed new Hego sensors because it wouldn't start, but several other technicians said this was nonsense, as the Hego sensors don't do anything for about 20 seconds after the engine starts. When the car is running the Hego O2 levels do vary from approximately -16 at idle to 0 at fast idle (say 2000 rpm). They don't go positive, but if the engine is running rich we wouldn't expect it to? The car had been running rough just before it let my son down, and had always been heavy on fuel, but he thought that was normal for this car. An ex Land Rover technician has checked the fuel pump for blockages etc and checked all the things we had already tried but to no avail. He also said the Hego sensors would not prevent the engine from starting. Do you have any other suggestions we could try?.
Yours hopefully
What do you guys think?
I don't know if you can think of a common fault that would cause my son's 1995 3.9 V8 Discovery to fail to start. We have tried everything we can think of (including borrowing a Testbook system) to cure the fault(s). If we add a jump battery and really crank it over and over eventually it will start and run, but the CO reading is too high (2%approx) and it runs "lumpy". We have tried new plugs, rotor arm, distributor cap, ignition module, fuel filter, checked fuel pressure, checked the ignition timing, checked for air leaks all around the intake and even tried a new filler cap. Without the jump battery the engine will crank ok, but usually fires once or twice then refuses to start. We suspect from the readings on Testbook that the injector opening times of 2 to 3 milliseconds means the engine is overfuelling and flooding the spark plugs. The local Landrover agent here in the uk had the car for weeks, fitted a new coolant temperature sender they said was faulty, and then said it needed new Hego sensors because it wouldn't start, but several other technicians said this was nonsense, as the Hego sensors don't do anything for about 20 seconds after the engine starts. When the car is running the Hego O2 levels do vary from approximately -16 at idle to 0 at fast idle (say 2000 rpm). They don't go positive, but if the engine is running rich we wouldn't expect it to? The car had been running rough just before it let my son down, and had always been heavy on fuel, but he thought that was normal for this car. An ex Land Rover technician has checked the fuel pump for blockages etc and checked all the things we had already tried but to no avail. He also said the Hego sensors would not prevent the engine from starting. Do you have any other suggestions we could try?.
Yours hopefully
What do you guys think?
