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, Wed, 12 Nov 2008 15:21:03
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Nobody mentioned that the jumper wire they are talking about goes on the relay socket. With the fuel system pressurized by jumping the two poles on the relay socket, you should be able to gently lift the plate without resistance.
One 99 that I worked was acquired through a tow-company abandoned car auction. It suddenly developed a no-start problem. In diagnosing the problem, there was a lot of pressure resisting lifting the plate. The plate is attached to an arm that is hinged inside the distributor body at the other end. The plunger contacts this arm just ahead of the pivot. Lifting the plate raises the plunger in the injector body, allowing fuel to flow to the injectors. Doing some research, I discovered, from various fuel system drawings that I have, that behind the fuel pressure adjusting plunger (it's on the side of the fuel distributor body, under a hex-head screw and normally should not need to be messed with) there is a tiny orifice between the upper and lower chambers of the fuel distributor. If that orifice is clogged, there is high fuel pressure on the top of the plunger, and none on the lower side, because the orifice allows the pressure to equalize. The high pressure prevents you from lifting the plate. Removing the hex screw allows access to that orifice for carb-cleaning spray. It took a couple of washings with cleaning solvent to clear the crud out of the orifice. Once I cleared the orifice, I was able to lift the plate easily, as the pressure on both sides of the plunger was equalized.
If you remove the hex screw from the pressure regulating valve, be _very_ careful not to lose any of the parts behind it. There is a small spring, a plunger, and possibly a small disc, which is a shim to modify the spring pressure on the plunger. I seem to have run across at least one car that had two of these tiny shims. The plunger should also have a small rubber seal on it. When the system reaches a certain pressure (determined by the spring pressure and the thickness of that little shim), the plunger is pushed off of its seat, and excess fuel bleeds off down the return line to the tank.
posted by 71.214.68...
, Mon, 10 Nov 2008 20:38:07, Wed, 19 Nov 2008 21:07:56, Thu, 20 Nov 2008 17:35:24, Mon, 17 Nov 2008 15:01:32
, Mon, 17 Nov 2008 18:58:58, Tue, 18 Nov 2008 09:16:44, Tue, 18 Nov 2008 09:14:33, Mon, 10 Nov 2008 20:42:20, Mon, 10 Nov 2008 20:51:35, Tue, 11 Nov 2008 05:09:17, Tue, 11 Nov 2008 07:32:28, Tue, 11 Nov 2008 10:38:27, Wed, 12 Nov 2008 15:21:03, Sun, 30 Nov 2008 13:02:00
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