|
|
|
I am working on a 1980 245 DL with the B21F motor. I am tracing down bad vacuum lines and in the process, identifying problems with the cold start circuit. I have already idendified a bad thermal time switch.
I also tested the auxilliary air valve by applying +12 VDC across the terminals. I observed the damper opening slowly rotate to a closed position in approximately 30 seconds. I then removed the voltage and watched the damper rotate to an open position in the same amount of time.
I then tested for voltage at the wiring harness between the two leads - with the key on, no voltage, and with the motor running, no voltage. It looks like this valve is sourced through the fuel pump relay (blue wire?). I checked that wire at the relay, and it is switching +12 VDC. Are there any other components between the relay and the auxilliary air valve? My diagram indicates not.
--
Ten Sleep 1980 245DL 1995 850 Turbo
|
|
-
|
|
First let me compliment you on your post. To me it's well written, with nice, short paragraphs, and most welcome "white space".
You don't say what diagram you have, but there is a connector between the Fuel relay and the AAV. I have it hand-marked as position 7 in the gray 8-pin firewall plug.
My notes from an '83 turbo harness job show it as (perhaps?) being the one on the Left side**. Maybe one blue wire in from relay, and two blue wires out to AAV and WUR. (Got +12 on WUR blue?)
If you have a Bentley, you can see the connector symbol (a rectangle with •• inside) in the lower right of grid B-1.
** EDIT: Now I see it's not a turbo, so there's just one firewall plug. But it's still pin 7, with a Brown wire in pin 8 to/from Starter #16 below it.
(Frankly, the brown wire puzzles me now, since it doesn't come from inside. Maybe it runs from Starter 16, to the plug, then to the Coil side of the Ballast resistor near the right hood hinge??)
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
|
|
-
|
|
|
Thanks for the compliment, Bruce, but I do have to admit that I have not bought my Bentley manual yet - I'm struggling along with a Chilton's. In addition, the previous owner has left me with some wiring messes underneath the dash. I will order my Bentley manual today.
The Chilton's says that the second blue wire goes to the control pressure regulator - is that synonymous with the WUR (I'm not sure what that acronym stands for)? On the fuel pump relay, +12 VDC comes in on terminal 30 via one red wire and is switched by the relay to terminal 87b, to which the two blue wires are connected.
I'll see if I can track down the second blue wire to the WUR(?) or pressure control regulator.
Thanks for your help on this one!
--
Ten Sleep 1980 245DL 1995 850 Turbo
|
|
-
|
|
|
...and means Warm Up Regulator. That's the Bosch term, but really it's more than that, since Control Pressure (Regulator) is important after warm up too.
Tell me where in Chilton you found that wire color and relay terminal information. It's correct, but I have 2 editions (pretty good K-Jet description, with few errors), and can't find those details. Mine are 1970-83, about 1/2 as thick as the 1970-89.
You can find Bentley manuals online for under $30. It will be 99% good for your '80. I have an '80 too, that I saved from death last Fall. Last registered in '95, with 127,000 on it. The main problem was broken timing belt since '95 I guess. PO had put in a NAPA coil trying to get spark. With a new belt and cleaned-up ignition connections it fired up with an old Bosch coil, and ran pretty good on the gas in the tank.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
|
|
-
|
|
|
My Chilton's is Manual #72300 for 1970-1989. I am using Fig. 25 on page 5-20 for the fuel system. I am using Fig. 100 and 101 on pages 6-66 and 6-67 for the electical systems. I am making notes on these schematics as I go, i.e. the pinout on the fuel pump relay and ground on the thermal time switch.
Thanks for clearing up the control pressure regulator/warm up regulator question - just wanted to be sure we were talking apples to apples! I haven't had the time to locate the CPR/WUR under my hood - could you give me a clue where to look? From Fig. 25, it looks like it mounts on the bottom of the air flow sensor housing, radiator side.
Yeah, I can relate about resurrecting old cars - if I can sort out the minor problems with mine, I have every confidence that the old girl is sound in all major respects, i.e. no rust, no wrecks, just replaced most of the wear components in the suspension systems, etc.
--
Ten Sleep 1980 245DL 1995 850 Turbo
|
|
-
|
|
|
I wish I could refer you to a Chilton page or picture, but my 1979-'89 is an old # 7040, with no section numbered pages and nothing electrical on FI.
The CPR is on the block toward the front, under the intake. There are 2 fuel lines on the top of the FD running from it back to the FD (14mm and 12mm banjo bolts). Not real easy to access, but that's where you'll attach a fuel pressure gauge (at the 14mm Banjo), if it comes to that.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
|
|
|
|
|
