I'd be willing to bet the noise is the diaphragm vibrating in the FPR under pressure.Somewhere under the hood. Couldn't pinpoint it before I yanked the wires to prevent damage.
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I'd be willing to bet the noise is the diaphragm vibrating in the FPR under pressure.Somewhere under the hood. Couldn't pinpoint it before I yanked the wires to prevent damage.
plausibleI'd be willing to bet the noise is the diaphragm vibrating in the FPR under pressure.
I'm in the process of removing everything between me and the injectors. Having a hard time removing the intake manifold. Yes, I'm using the FSM (page FI-57). Figured I'd ask in this thread instead of making a new one.
I've removed the connectors, hoses, EGR stuff, cold start injector pipe, the 2 bolts holding the stays in front and behind the manifold, 2 nuts and 7 bolts at the bottom of the manifold. The thing will not move. The mechanic I took it to previously decided to put a silicone gasket on the mating surface at the bottom. Could that be holding it? I gave a couple good tugs and it didn't release.
I was finally able to pry the intake manifold off. For the record and those who might have the same problem later on, the solution was to use a gooseneck crow bar. The ones that curve back towards you. I found the best location to place it was between the air/smog pump and the manifold. My manifold had a nub that sat above the mating surface that I could grab a hold off. Needed to take off the air tube from the filter to the pump. Pry towards the front of the vehicle.
As for the repair, I'll get at the injectors this week then have them cleaned.
best of luck.. happens to all of us :dI need to not be so mechanical and think when doing things. When the injectors were initially removed, the rubber spacer stayed in the injector cup. I doubled up when I went to install refurbished injectors. Hence the issue. Ordered new cups+orings. The old ones were nasty. Thanks for the rubber ducking MUD!
I'm about at the point of doing the fuel injection on my rebuild, so this and the diagnostic info, is timely.
Do you happen to have a pic of the end of your injectors? I'm curious which style they are.
Sweet, thanks. I'm more curious than anything else, because I have both kinds. I've got a '90 date (91 model year) motor and a 91/91 motor, and the injectors are different between them.Here ya go. If you want anything else let me know before I put everything back in.
View attachment 2325689
you can temporarily install a non return valve on the main fuel supply line.Got around to tackling this annoying startup issue again. Truck was in the shop getting some good good upgrades done. Had the valves adjusted and timing checked. Timing was spot on and valve adjustment was minor. Engine sounds great with a little less tick sound. But starting issue remains.
I tested the fuel pressure again today, as I never did so since rebuilding the injectors. Shop said they observed no leaks when rebuilding.
Pressure at idle = 36 psi.
Pressure with fuel regulator vacuum disconnected = 44 psi.
Pressure seconds after turning engine off = 14 psi and dropping to about 5 psi in less than a minute.
Based on this, I think the only possible cause of this is a faulty check valve in my *new* denso pump. Am I correct in this diagnosis? If so, is there a way to fix the valve without getting a new pump?