I sure hope hope someone can help me.
my daughter has a 1993 maxima SE (3.0 DOHC) that ran ok until one day when she left work and started the car it was running very rough (missing and sputtering).
She had the car towed here and I looked it over,it had a lot of visible problems which I have fixed (cracked coil packs,leaking valve cover gaskets, filthy fuel filter,clogged pcv valve, oil saturated air filter,spark plugs burned down to nubs etc, I replaced all those obviously defective parts) but the car still idles very rough,idles too low RPM
s(400-500 rpms),exhaust smells like raw fuel and it only gets 5 miles to the gallon on my last test drive.
I removed the intake manifold to get to the rear fuel injectors to see if they might be stuck open and leaking.The car had been sitting for about 5 days with the battery disconnected and when I removed the first injector there was no fuel in the injector or the rail and no pressure in the rail.
I left the injector out overnight and the next morning there was fuel all over the top of the engine and in the fuel rail.
I put the injector back in and unbolted the rail,I reconnected the battery and turned the key to start the fuel pump.I waited for about 3-4 minutes and did not see any fuel leaking from the injectors.I turned the key off and removed it from the ignition,disconnected the battery and bolted the fuel rail back down.I again removed one of the injectors and there was no fuel in the injector or the rail and no pressure in the rail.After about 2 minutes, with the key out of the ignition and the battery disconnected,I saw fuel start filling the rail and the injector port, so I quickly put the injector back in.
I`m thinking the next step would be to replace the fuel pressure regulator and recheck the injectors for leaks.Am I on the right track here with the pressure regulator? What could be causing the car to suddenly start acting this way, my daughter said the car ran fine on her way to work ( although I hardly think it could have been running “fine” with cracked coil packs,clogged air filter,worn plugs etc)
Any suggestions will be greatly appreciated.