Thread: Where did my power go??

They sell generic injector pulse width reader. It actually plugs into the wiring to test the signal to the injector. Generally they just flash when the injector is supoosed to be open.. So if it stayed on uwoudl know if u had problems electically.

I changed out my FPR earlier today and to my surprise, and disappointment, it still didn't solve my problem. I really had high hopes that this would do the trick.

With the key turned to ON, I get closer to 48psi now compared to 43psi before I changed it. After I start the car I am getting 84psi compared to the 78psi to 84psi before I changed it. I also pulled off the vacuum line with the engine running and there was no change. I was able to position the pressure gauge so I can see it from inside the car. While the car was in gear but holding down the brake, I am able to rev the engine enough so that it bogs down. The fuel pressure is still above 80psi while the engine is bogging down.

I'm not exactly sure of the mechanics behind the supercharger but it also seems that the bogging happens whenever the supercharger is giving boost according to the dashboard gauge. Could part of the problem be that the engine is getting extra fuel because of the boost but not enough air to match and is therefore dumping in way too much fuel with out enough air to back it up? Like I said, I'm not sure of the mechanics behind the S/C but I'm grasping for straws. I still don't think this would explain the reason for such high fuel pressure.

Any suggestions would be greatly appreciated.

With high fuel pressure, the first thing that pops into my head is some sort of obstruction in the fuel filter, fuel lines or fuel rail, or possibly a kinked line.

When's the last time the filter was changed?

Inspect the entire fuel path (lines/rail) for kinks/bends.

If you can get your hands on a cut-off return line with fuel rail quick-connect, you could hook that to your return on the fuel rail, put the other end into a fuel can, and check pressure then; if it's normal, at least you know the obstruction is somewhere after the rail.

I changed the fuel filter twice since since this problem with bogging down has started.

Someone else had also mentioned to me about checking to see if the return fuel line is blocked. I tried to disconnect the return line where it changes from the steel line to the rubber line (directly above the motor) but I can't seem to get it disconnected. Is there a special tool I would need to disconnect them?

I'll also try to get the car up in the air so I can inspect every inch of the lines under the car.