I have a 92 RR with about 60 k miles on a 4.0 replacement engine. It makes a banging backfiring type sound under load at about 2000 rpm. It runs perfectly if you rev the engine w/o load to 5000 rpm. There is some loss of power when you have the noise.
I have had it two mechanics working on it.
So far: new plugs, new wires, new distribute cap. Checked timing, checked compression, removed and tested catalytic converters, replaced coil, replaced wires a second time, new fuel pump, replaced fuel with new fuel, new fuel filter, had the fuel injectors cleaned, fuel pressure is fine, new temp sensor on the injection. Oil change too. Check engine light is not on. Rovercom shows that the engine is running fine with no errors.
Ok what is it?
I have had it two mechanics working on it.
So far: new plugs, new wires, new distribute cap. Checked timing, checked compression, removed and tested catalytic converters, replaced coil, replaced wires a second time, new fuel pump, replaced fuel with new fuel, new fuel filter, had the fuel injectors cleaned, fuel pressure is fine, new temp sensor on the injection. Oil change too. Check engine light is not on. Rovercom shows that the engine is running fine with no errors.
Ok what is it?
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