I have spark and engine runs briefly on sprayed fuel, but no power to injectors. Checked for power at injection harness and no pulses when cranking. Tip over switch is in up position and checks out. What gives?.... Any tips would be greatly appreciated.

Pat

First. Leave the inrichment system out of the equation.

Second One wire to the injector should be hot all the time when ignition switch is on. It makes it's pulses when a thing called an injector driver is energized and it then closes and makes a path to ground.

Third go to auto parts store and buy some "Noid" lights. Find the one that fits the injector connector and plug it in. It should flash. If it doesn't you either don't have power or the driver isn't switching to ground out the circuit. The power is probably a fuse or broken wire.

Ignition fire at plugs and no impulse at injectors is probably in cam sensor circuit problem. Ecm's don't go bad very often.

Go out and buy another cam and crank sensor. the quickest way to test them is replace them and it is nice to have back ups at the race track.

The driver gets more complicated. Usually a broken wire or stretched out or corroded terminal from the cam sensor to the ecm.

Take that turn over switch and open it up carefully and epoxy it, If you don't you will wish that you had.

Honest Dad himself

Unwrapped cut down harness and some shady grounds were made. Cleaned up the issues and tried again. Fired right up. Then intermittently it would just die. I carefully pulled the tip over sensor apart and tried it in different positions and presto!! Found the issue that was really causing the problem. Epoxied and now I'm good. Thank you for the information.

Pat

When the injected motors first came out a local hot shoe at Little Salem was the first to get one. This was before they cut down the harness, he even had the spedo and ign switch. That thing was fast, he won his heat and started on the pole for the main. About 2 or three laps went by and as he was going into turn 3 he decided to show off a bit and threw it in then he hit a rut and that roll over switch thought that he had flipped and killed the car in front of 19 other cars. He regained his composer and went to the tail and it did it again. Best I can remember it took about 3 or 4 races to figure out. If we could get these cars to lay over like a motorcycle does in the turns that switch would be neat but since we can't that thing can cause real problems.

Put your self in that guy's seat.

Honest Dad himself