I'm doing a tune-up on my /90 Mustang 5.0 L. I've got an idle that surges from about 600 to about 900 rpm every few seconds when engine cold, after it warms up the idle surges from about 600 to 700 rpm every few seconds. I've replace all plugs, plug wires, rotor, dist. cap with no change. I pulled the PCV valve and grommet with no problem, but the screen for the PCV valve won't budge. I used a hook at the end of a wire and it still won't budge so I made a sort of snorkle and used that to spray carb cleaner directly onto the screen. The idle now holds perfectly at 750 rpm with maybe a plus or minus 10 rpm. My concern is that this cleaning maybe won't hold for long and I definitely want to remove the screen for proper cleaning. Mark Houlahan, in his book "Mustang 5.0 Projects" (an excellent how-to book by the way) uses a pick to remove the screen, no auto supplie store around here knows what a pick is (maybe it's called something else up here). After struggling with this screen for the best part of any hour, I'm thinking maybe it isn't what is used but that there may be a special technique in removing the screen outside of removing the intake manifold.
Any help or tips would be much appreciated. Thanks in advance.
Cheers,
Mark
Any help or tips would be much appreciated. Thanks in advance.
Cheers,
Mark