The frequency valve should be a constant noise. Before you suspect the computer make sure the relay isn't cutting in and out. I saw this happen on another car and we thought it was the relay, it was a bad connection to ground. The valve is grounded by a single wire going to the side of the air intake. Make sure all of the connections are clean and tight. Replace the "O" ring seal on the cold start valve where it connects to the intake while you have everything apart. These are usually included in what the vendors call a Master Water Pump Kit. If you aren't replacing the water pump you should replace the 2 hoses behind the water pump and the seals on the water distribution pipe as long as you are in there. Since you have had trouble with the injectors plugging up you might consider emptying the fuel tank and cleaning it out and then replacing the fuel filter. Maybe it is the gas you are using? Before reinstalling the intake pressure test the cooling system to make sure there are no leaks. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "Jim Reeve" <ultra@xxxx> wrote: > As an update to the hesitation issues with my car, 5 of my injectors > have a poor spray pattern. These were brand new in spring of 2001 > when I rusted my original ones. I'm going to have them > professionally cleaned with the bosch tool or whatever it is (my > uncle has the thing) next friday. > > My car also seemed to be running perfectly when analyzed. It had .02 > CO emmitions, 0 of the P emmitions (I honestly dont remember what > that one is called, I just 96know there is a P in it). Thats also > without a CAT. The timing was dead on. >