Idle/Governor issue
- Thread starter 85hauler
- Start date
Chuckdiesel
Full Access Member
Well I dont have an answer but I think I idle high as well about 800rpms where is the normal range and How can I adjust it
Mine used to idle around 600 or so. My other truck idles at 650, I think the valve cover decal says 650. Normally you adjust the screw on the linkage on the side of the pump. I now have the screw back off so much that it doesn't even contact and my idle is still at 875.
whitestroker
Registered User
what was your rpm increase?
Mr_Roboto
Full Access Member
I know that moving the "torque" screw on the back of the IP will change the idle speed. I forget which way does what.
Isn't the torque screw only on the factory turbo pump?
It will now rev too 3900 out of gear just holding it at WOT. The current pump would only rev to 3000 before. The first pump that was in the truck when I got it (Had it rebuilt 1 time) would rev to 3400 or so. I was only looking to get it back to the 3400 -3500 range but 3900 will do.
dieseldummy
Lost in time
If the low idle screw doesn't do anything you'll need to take the top cover off and adjust the springs. To get it to idle lower you need to tighten the spring down so that the whole assembly is shorter.
Diesel JD
Full Access Member
With the pump cover off, just make sure you have something to clap over the intake in case it tries to runaway on you. Good luck with that, you showed some major guts diving into one of these pumps yourself. What you did is one of the two big mods that Ken and other performance pump builders do to make a turbo pump. 1) Replace gov. springs with GM for higher redline 2) adjust fuel delivery curve 3) replace the fuel plungers with larger ones.
The Injection pump is about the only thing in the Auto and Diesel world that I haven't dived too deep into. I've been building drag cars for years and have worked on everything from heavy equipment to single engine aircraft. The injection pump is the final frontier so to speak. I have a spare one that I plan too tear down and rebuild, but there is little info available on the pumps. The pump shops tend to be tight lipped about the inner workings of the pumps. If the info was more readily available then I don't think people would be so scared of them. It's just another mechanical device.
dieseldummy
Lost in time
Yeah, tighten just like you said. You might get a few more RPMs that way too. I agree with you about the pumps and lack of info. I was always tired of not being able to find anything out about them so I jumped in with both feet. I'm no expert now, but I do fully under stand how they work.
