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Erik,
I have an '84 900S, which is nearly identical to your '85 model (engine-wise), as both have the 8V motor. The fuel pressure regulator on 16V cars isn't quite the same as the control pressure regulator (a.k.a. "warm-up regulator") on 8V cars like ours.
On 8Vers, the "warm-up regulator" controls the fuel pressure (control pressure) which bears against the fuel distributor plunger, and, in turn, the airflow meter--an arm and circular plate--(which all air coming into the motor must flow past). The "warm-up reg." (and related pieces in the fuel distributor) are what makes the fuel/air mixture richer when the engine is warming up to operating temperature.
How it works: when the car is cold (has been sitting w/motor off), the warm-up regulator sends less fuel pressure to the fuel distr. plunger, making it not have as much pressure against the airflow arm (and metering plate), so at any given airflow rate (i.e. throttle opening) the mixture is richer than normal. The warm-up reg. has an electrically heated thermostatic coil inside linked to a fuel valve (the reason for its electrical plug & fuel lines) which gradually warms up the longer the engine runs, and gradually opens its valve up and, thus, the fuel distributor plunger to full line pressure (normal or warm value).
A malfunctioning warm-up reg. will provide cold-engine compensation ALL THE TIME (I think), making the mixture too rich when warm and causing driveability problems when engine is warm.
Other 8V fuel system spots to check are clogged fuel filter, sticking fuel distributor plunger (if magnet or needlenose pliers can't raise the airflow plate, located above the air filter, then plunger is prob. stuck closed, necessitaing it's removal & cleaning in gasoline), and fuel spray pattern at injectors. Check injectors by jumping fuel pump relay terminals 30 & 87 together w/relay removed and lifting airflow plate--with injectors CAREFULLY unbolted from intake manifold and placed in a pan/bucket/etc. Fuel lines don't age gracefully and become brittle, so don't bend them too much! Fan-shaped pattern is good. Haynes 8V manual shows good pictures of both good and bad spray patterns, not sure about Bentley 8V.
So, to answer your question, the warm-up regulator (or fuel pressure regulator) is not really in the fuel distributor area.
Hope this helps and is pertinent!
Micah in NC
'84 900S, 205K mi.
'90 900, 60K mi. (Mom's)
posted by 208.61.12...
, Mon, 18 Mar 2002 20:15:00
, Mon, 18 Mar 2002 18:05:45
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