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Ether is combustable, right? Right. So ether in the combustion chamber is just like extra fuel. Thus, I still say you're just not getting enough fuel. If you were, you would have had fouled plugs by 10 starting attempts (I assume you've pulled the plugs after you tried to start the car).
Anyways. According to the Volvo manuals, only the turbos (and maybe some V6s) got the impulse relay. So I assume yours was very much an aftermarket job. The impulse relay should be wired in parallel (not series) with the other thing (thermal time switch) controling that fifth injector.
If you're having cold start problems, the TTS is probably to blame. The thermal time switch is designed to pulse the cold start injector when the coolant temperature is at or below a specified temp.
If you're having hot start problems, the impulse relay is probably to blame. The impulse relay is designed to pulse the injector when the coolant is warm to avoid vapor lock.
Of course if the impulse relay wasn't wired in properly, that could be the cause right there. If you indeed have no hot start problems, you should have no problem ripping out the impulse relay and all of its wiring.
- alex
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