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Originally Posted by cdigerlando
Great ideas guys. Thanks.
I actually had some injector rail leaks where they were welded. Had them rewelded twice  Now I can't see any leaks. My fuel rail system is now custom and simplified from the stock arangement. I was thinking of pulling the rails from the motor and energizing the fuel pump to see if I see any leaks into the intakes, or like was said, one of the injectors is failing to close, since I cannot see any visible leaks. If everything is OK I was thinking of draining the fuel and blowing some smoke into the system. Then using my compressor rubber nozzle to pressure test the system with a couple of psi of air.
Still stumped about the tach. Pehaps this is the trouble with the electrical? I'll try these things this weekend and let you know how it turns out.
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The tachometer receives its signal from the ECU. This could indicate problems in that direction, with crank angle sensors being possibly suspect.
You will have quite a weekend. Careful with smoke generation and fuel.
Best of luck, Trevor.