sweet928

I just picked up a 2nd 928. This one is a '80 auto. It's really a nice car but it needs some attention. I (in part) bought this one to learn how to do my own work without making mistakes I might regret on my minty '79 (which is the same color as the 80).

The 80 starts and runs but -- is running rich. I did some searches but can't really find where to start for MY. Any help would be appreciated.

From what I know so far I can get a long allen key and start turning the screw (very slightly) in the MAF but it's a cheater way to adjust a different and likely problem. Any better place to start?

My green wire is frayed and getting replaced and my temp II sensor connector is loose and cracked and also getting replaced. I don't know if that could cause a rich running. The car has new injectors and plugs and fuel pumps and fuel filter from PO.

Thanks,

scotts911e

well my car had the same problem first check to see if there is any fuel in the vacuum lines going to the fuel regulators and the fuel dampener my guess one or all of them are leaking if not check the vacuum lines for cracks or leaks. The vacuum itself limits the amount of fuel so if there isn't any or not enough then the regs. will operate at full pressure all the time giving you the rich mix. hope this helps!
1979 non euro auto
1982 non euro auto

sweet928

I'm new to doing my own work. Can anyone point out the lines to inspect on the enclosed picture of my engine? Thanks for your help!

por917

The fuel dampener is in the front center just under your spark plug wires in the pic, the vacuum line runs from the dampener to the aft side of the throttle body. To check your 2 fuel pressure regulators you will have to remove the airflow sensor housing. This is the housing that contains the air filter. It's no big deal to remove, just take the top off remove the airfilter and you will see two 13mm bolts. Remove them and lift the body out of the throttlebody housing, but as you lift there is a electrical plug that has to be disconnected. The way to disconnect it is on the sides there is the retaining wire which wraps around the plug just push it back on one side and pull lightly then get the otherside. Once removed you will see the pressure regulators one on each side. The vacuum lines are on the aft side of them and should be attached. You will also be able to see the other vacuum lines with the Airflow sensor housing removed. I hope this helped.
Rich

sweet928

Thanks. That helps a lot. I'm going to try to start tomorrow. Assume I should disconnect the battery or not necessary?

por917

I would disconnect the battery. Whenever you do anything that involves disconnecting plugs and such it is a good practice to do it. Just disconnect the grnd i the back behind the tool carrier, but just make sure it is secured from touching the body. I usually rest the tool carrier on top of the grnd stap and leave the wingnut on the carrier.

Ethre

Be careful with those vacuum lines. The ones underneath the plenum were plenty brittle on my car. Stands to reason they should be on a 79 too.