Question: 5.7 Olds Injector Pump Question

[archangel1190]

I bought a just about perfect 1980 Eldorado diesel, I know about them and was aware of their reputation. I have been driving it awhile and it suddenly started acting weird, last week i was driving it home and it was losing power and wouldn't respond when i would depress the throttle. I limped it home but several times it died while idling. I have been researching the injector pumps and read about the plastic ring that degrades and clogs the return line and this causes problems. I haven't had time to look at it, but i read to look for fuel coming out of the return line, also if the pump is bad whats a rebuild like, i am a mechanic so not afraid of working on cars but am afraid of messing up an injector pump. I have poppet injectors, but i am confused about rebuild kit and where to find the replacement metal ring.

[dieselolds]

It’s a easy pump to fix.A local stanadyne shop will have a rebuild kit with o-rings and seals with a new flex ring.I think it’s part number 24370.

[57diesel]

Its not too hard to get the top off these pumps. IIRC you kinda slide it away from the front of the car as you lift it to clear the shutoff solenoid. A look at what is floating in the fuel there will tell you a lot about the condition. If its clean fuel you should check other places before condemning the pump. If there is crap floating in the fuel there its done and needs a rebuild. If its clean chances are good the gasket will be in good shape too and go back on and seal so you aren't out much more than some time.



What part of the us/world you in? Cloth or leather interior? I still have my 80 Eldo and its got a good pump on it if you are not too far away from MN.

[archangel1190]

I live in Spokane Washington, so if you have a good working pump i would be interested in it as a spare, it would also allow me a little more time to learn on mine as i take it apart. My eldo has leather, stainless top, sunroof and just about every possible option, its a really nice driving car. and i am surprised by the mileage even with it being a diesel.

[57diesel]

Sounds like a nice car and you are a little far from me to make a whole parts car deal practical. At the moment I don't really want to just sell parts off it.



80 is an oddball year for the diesels. Partway through the year they switched from the pencil to micro injectors. 81 they added the cold advance so that makes a micro with no advance a half year item. Rebuild kits are not a problem because they were somewhat universal but the exact pump can be tricky. Later pumps should work and you can add the advance wiring since its the same circuit as the fast idle and glow inhibit.



Other odd thing about the 80 is the heads. There was only the part year that had the micro injectors and external EGR. 81 had the micro but internal EGR like a gas engine. IF you are looking at intake gaskets the ones you need have the 2 square gaskets for the crossover and the intake ports are also pretty square. The later and more common internal EGR gasket set has more rectangle crossover gaskets with the small egr port in the middle of them and the intake ports are also more narrow and rectangle. If you get the wrong ones you end up with leaks into the crankcase which isn't good for a diesel.