Boost Control Solinoid wiring

[under pressure]

I have a 85 model SVO that had the original style boost control solinoid. I converted the engine over to 86 model specs, cam, PE computer, head, etc. I tossed the original BCS and adjusted boost by the threaded rod on the wastegate and always ran the car in the premium position. I aquired a 86 model BCS that I'd like to hook. The 85 BCS connector out of the harness has 3 wires. Red, Orange, Black or dark blue, smaller guage ( 12 or 14ga.) The 86 BCS has 2 wires, Red, Black with Red or a light Purple stripe. Can I wire the 86 style into my harness without smoking the computer? Thanks Rick

[SVOeric]

I split this out into a new thread, as it really had nothing to do with the other thread you stuck it in.

You will have to get wiring diagrams for each computer andcheck the pin-outs. then figure out which wire needs to go where. You may have to re-pin, or you may be able to plug and play.

[NavySVO]

Rick,

Lemme look at the diagrams I have and get back with you later today. I am at work now, and they are at home.

If someone gets to you first, cool.

Kurt

[NavySVO]

Rick,

according to my schematic, the boost solenoid gets it's VPWR from pin 37 and boost cotrol comes from pin 32 (octane switch runs through these same pins too).

NOTE: pin 57 piggie-backs with a VPWR tie-in with pin 37

If you give me an email address, I will scan this and send it to you.

[under pressure]

Thanks Kurt. Check your pm. Rick

[under pressure]

Ok I tested the 3 wire connector off the harness that connects to the old style BCS module. Red has power on it all the time, no matter which position the fuel switch is in, (reg. or preium). KOEO. The black wire has no voltage and does not go to ground. The black wire changes resistance. In the reg. position the black wire has 60-64 ohm's. In the preium position it has 104-107 ohm's. the orange wire has no power, no ground, no resistance. The 86 BCS has a red wire and a black with purple stripe. I'm not sure what the VPWR means. (voltage power with resister?) I think the VPWR out of pins 37 and 57 , connected together(PE comp.) are hot and is the red wire going to the BCS on the 86 style. I think the black/purple wire goes to pin 32 (PE). Can somebody with a 84 elec schematic look for the 3 wires to the BCS see what colors they are and what pins they come out of the 84 ECA, and can somebody with a 86 see if the resistance changes on one of the 2 wires that is connected to the 86 style BCS I think the black wire on my harness( purple on 86) might go to pin 30, old ECA, pin 32 (purple) on PE. This whole thing might be too wirery!

[Alex L]

im in the same position. just swapped out my FE for a LA3. the directions i found only said to disconnect the boost control module, but not how to hook the BCS up to the harness.

the black/purple wire does go to pin 32, directions said to move it to pin 31 for the LA3.

seems the gt350r site is missing the svo schematics, but we do have this, for the LA3. its only 1 pin differnt then our applciation for what we care about. it shows pin 31 (32) being connected to one side of the BCS, and the other side being connected to the hot red. I think you're right on the color matching.

Ill try it tommorrow morning. love being able to spin the piss outta it, but I'd really like my boost back as well.

[NavySVO]

Originally posted by under pressure
I'm not sure what the VPWR means. (voltage power with resister?)

Can somebody with a 84 elec schematic look for the 3 wires to the BCS see what colors they are and what pins they come out of the 84 ECA

VPWR = V ehicle P oWer supply voltage R egulated to 10-14 volts

As for the 84, my reference for the '84 is a little vague as to the certainty, because it doesn't show the VPWR for the boost solenoid coming from 37 and 57, although 37 and 57 seem to provide voltage to the same goodies that need VPWR to actuate(injectors, EGR solenoid, IAC, fuel pump(s), WAC, inertia switch and STC). Actually, the boost solenoid isn't on this schematic, BUT it does reference pin 32 (same as '85 and PE) as the boost control pin with a line coming from it stating "to boost control circuitry".

As for the 3 and 2 wire configurations, the 2 wire plug is for the Boost Control Solenoid (BCS). The 3 wire is for the Boost Control Module (BCM). The BCM does not get wired to the EEC (at least not in anything I have looked in..), just the BCS, with the 2 wire configuration going to pins 37 & 57 for power supply, and 32 for ground (accomplished through the EEC).

ALEX

Check your link, it no workee bro.

[SVOeric]

Alex -- to be able to do this, you will have to swap to the newer style (85.5-86) boost controler

[Alex L]

Originally posted by SVOeric
Alex -- to be able to do this, you will have to swap to the newer style (85.5-86) boost controler

well crap. i already hacked the harness to wire it up, with no avail. *shrug* been meaning to get a gillis valve for a while, guess nows the time, eh? Then i can use the BCS wires to tap in a ACT sensor when i switch intakes.

as for the image, looks like angelfire doesnt like hotlinking. ill snag it down to digipimp and post it when i get home.

[under pressure]

Kurt. The schematics are quite vague from one to another. On the print you sent it shows the BCS and below it it says Non-SVO. I'm not sure if the black wire or the orange wire in my early wiring harness returns to the computer from the BCM to pin 32 or 30. On the print you sent (86) at the top it shows the octane switch connected to pin 30( NOS A/T only, and just below it pin 30 NOS M/T only it goes straight to ground. I need to know where the black wire and the orange wire go from the BCM on a 84 schematic. Thanks for your help I know that reading these weird wiring diagramns are brain racking. Rick

[NavySVO]

Originally posted by under pressure
Kurt. The schematics are quite vague from one to another. On the print you sent it shows the BCS and below it it says Non-SVO. I'm not sure if the black wire or the orange wire in my early wiring harness returns to the computer from the BCM to pin 32 or 30. On the print you sent (86) at the top it shows the octane switch connected to pin 30( NOS A/T only, and just below it pin 30 NOS M/T only it goes straight to ground.

Rick,

The 2 boost solenoids shown (SVO and non-SVO) are there because that schematic is for 3 different cars........look at the top of the page. The other part for pin 30 is NDS or Neutural Drive Switch, the M/T (manual trans) and the A/T (auto trans).

I cannot help you as for the wire color.

Email this guy to see if he has the EVTMs for both years. He got me one for my '85. He got me all the Ford service books I have, and takes PayPal if you use it. Quick shipping too.....about 3 days.

dvogelauto@aol.com

[Gyrhead]

Ford Diagrams?

Guys are they the Ford diagrams?

I bought, way way back, the 86 Ford Mustang wiring diagrams (18x24" fold out ones) that you read like a map by coordinates. So if the BCS is indicated at C210, you flip the pages to 210 and follow up to C. Pretty neat and comprehensive. So far I've found them to be highly accurate for my 86' SVO. They show all the connectors and their design, so if it's an "D" style, the diagram shows it, along with the wire colors, tracers, wire gauges and circuit numbers. Nice resources.

If anyone wants me to look up a circuit and scan the diagram in, I can.

[NavySVO]

Re: Ford Diagrams?

Originally posted by Gyrhead
Guys are they the Ford diagrams?

No Paul, they are from a FI and EEC book I have. Thedrawings are also just for the EEC-related components, and do not include all the wiring for the car.

[under pressure]

Ok first Kurt thanks for the help and the wiring schematic. I got it figured out. The old 3 wire connector plug which connected to the BCM, Red .. orange ... black. Red VPWR (voltage, pin #37 which is connected to pin #57)... black- connects into the fuel selection switch from there it changes color to purple and goes to pin # 32 of the ECA. In the regular fuel position the black wire is open and has no continuity to pin #32. In the preiumn position there is continuity thru the BCS thru the black wire thru the switch to pin #32 (purple wire). There are 2 orange wires that come out of the 60 pin connector. Pin #49 and Pin #26, both orange. # 26 goes to the MAP sensor. #49 is the ground for the EGOG. I'm not hooking up the orange wire. Alex there is nothing connected to pin # 31 on the 60 pin connector & the PE computer does not have a pin for # 31. Eric I know it is a B-Map but the schematic refer to it as a MAP sensor so if someone reads this they'll not be confused by reading the schematic prints. Ok it's a done deal! Rick