Andre Hedrick

This is my next guess on my adventures to try and pass smog.

Stromius

I think that by using the fuel pressure guage on the passenger rail (remember temporary is recommended now), you should see pressure remain fairly constant for say at least 30 minutes after running and turning off. Mine disapated after a short few minutes thus confirming a need for new injectors. I did rule out the dampers and FPR first though.

Andre Hedrick

Well to add to the list ...

Fuel Pressure Gauge bounces when the injector/injectors fire by about 5-7 psi.
You lean the car out and then pull your CAT and look up the manifolds.

My fuel pressure regulators where shot and have been replaced.

Bart-Jan

If the fuel pressure is dropping, I guess also the check valve could be broken. Or you have a leak somewhere. It won't help you to test the injectors I guess.

Why not pull them, put compressed air on the inlet and stick the outlet in a cup of water?

Andre Hedrick

I would go there but when I pulled the CAT the last time, the driver's side manifold was red-brown rust like the plugs, and the passenger's side manifold was black shoot but the plugs were red-brown so one or more must be leaking on the exhaust stroke. When I lean it out and come off the throttle, the backfires are horrid so they are getting worse.

I failed smog for a second time even worse than the first. time.