928 Questions
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Joined: Apr 2013
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From: Nipomo, Calif.
928 Questions
Hello, My son and I bought a 1988' 928 s4 A/T with 78,000 miles, engine basket case (engine was completely disassembled) old owner tore it apart because he thought it blew a head gasket but later found that it was only the oil cooler. Thanks to some kind folks on this forum we were able to rebuilt the engine (What a project). We finally started her up and sounds great, but I do have a few more questions if someone has the time.
#1, Cant find where this female 2 wire connector goes (its on the main engine harness and goes through the fire wall and end near fuse panel).
#2, needing vacuum diagram for connections near brake booster.
#3, I got one little bracket left and cant figure wear it goes.
Thanks soooo much
#1, Cant find where this female 2 wire connector goes (its on the main engine harness and goes through the fire wall and end near fuse panel).
#2, needing vacuum diagram for connections near brake booster.
#3, I got one little bracket left and cant figure wear it goes.
Thanks soooo much
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From: Oman
Do not immediately recognise the bracket but it sort of look familiar.
The 4 way vac connector consists of the feed from the booster, the line to the vac reservoir [located in the driver's side cavity behind the front wheel], line to the HVAC system under the dash and the line to the flappy solenoid.
The electrical connector is a puzzle. That is a water proofed field connector- i.e. logic says it belongs in the engine bay. I have never seen such in the central electrical area before but maybe something I have missed. Has it been pulled through accidentally [i.e. is the tail long enough for it to fit in the engine bay?]. Looks like the kind of plug that fits to the idle stabiliser. Does the motor tick over OK or does it die if you come off the pedal?
Regards
Fred
The 4 way vac connector consists of the feed from the booster, the line to the vac reservoir [located in the driver's side cavity behind the front wheel], line to the HVAC system under the dash and the line to the flappy solenoid.
The electrical connector is a puzzle. That is a water proofed field connector- i.e. logic says it belongs in the engine bay. I have never seen such in the central electrical area before but maybe something I have missed. Has it been pulled through accidentally [i.e. is the tail long enough for it to fit in the engine bay?]. Looks like the kind of plug that fits to the idle stabiliser. Does the motor tick over OK or does it die if you come off the pedal?
Regards
Fred
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From: Irvine, CA
Bracket goes over the lower posterior end of the passenger side valve cover and acts as a mount for the engine harness as it makes its way from the firewall to the rear of the engine valley.
That 3-pin AMP connector may be 'extra' for a US-spec car, I think it connects to the CO pot on European-spec 928's and thus isn't used here.
That 3-pin AMP connector may be 'extra' for a US-spec car, I think it connects to the CO pot on European-spec 928's and thus isn't used here.
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From: Oman
You are right- there is a connector of that type on the CO pot. Forgot about that one as there is generally no need to undo it!
Regards
Fred
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From: Dubai, UAE. Oxford UK during semester.
Bracket goes over the lower posterior end of the passenger side valve cover and acts as a mount for the engine harness as it makes its way from the firewall to the rear of the engine valley.
That 3-pin AMP connector may be 'extra' for a US-spec car, I think it connects to the CO pot on European-spec 928's and thus isn't used here.
That 3-pin AMP connector may be 'extra' for a US-spec car, I think it connects to the CO pot on European-spec 928's and thus isn't used here.
To the OP, There should be nothing connected to that if you have an O2 sensor and a catalytic converter
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Joined: Apr 2013
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From: Nipomo, Calif.
928 Questions
Thanks for the quick reply, but i'm still confused with one mistery vacuum hose, its the one that comes off the small check valve @ 90 dregees, also is there only one vacuum hose comming out of drivers fender well. The 2 wire female plug does it need to plug into something or do just I tape it up.
Thank You,
Jess
Thank You,
Jess
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From: Ball Ground, GA
Your vacuum set-up looks pretty good. The check-valve is usually a small, black and blue drum-shaped device. There are three small vacuum lines after the check valve:
- black, to the firewall to feed the HVAC system.
- black, white or yellow to the fender to the vacuum reservoir.
- white to the intake flap solenoid on the front of the engine. It runs along the top edge of the left cam cover, pretty much out of sight. Make sure that it isn't melted or broken by checking for vacuum at the solenoid with the engine running.
Either just tuck the electrical connector out of the way, or tape over the end if it makes you nervous.
- black, to the firewall to feed the HVAC system.
- black, white or yellow to the fender to the vacuum reservoir.
- white to the intake flap solenoid on the front of the engine. It runs along the top edge of the left cam cover, pretty much out of sight. Make sure that it isn't melted or broken by checking for vacuum at the solenoid with the engine running.
Either just tuck the electrical connector out of the way, or tape over the end if it makes you nervous.
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From: Florida
You can check the vacuum diagram on 928R'Us website (link below):
http://s287999742.e-shop.info/shop/p...WT&shop_param=
http://s287999742.e-shop.info/shop/p...WT&shop_param=
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From: Nipomo, Calif.
Thanks guys, but the mystery goes on. I'm still looking for one item in the engine compartment that needs vacuum. I already hooked up the flappy, reservoir and HVAC vacuum lines but have 1 more small line to hook up its the one that comes off the small check valve at a 90 dregee. please look at my pic's
Thanks again
Thanks again
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From: Mukilteo, Wa.
Thanks guys, but the mystery goes on. I'm still looking for one item in the engine compartment that needs vacuum. I already hooked up the flappy, reservoir and HVAC vacuum lines but have 1 more small line to hook up its the one that comes off the small check valve at a 90 dregee. please look at my pic's
Thanks again
Thanks again
Thomas
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From: Dubai, UAE. Oxford UK during semester.
That is not the original check valve, there should be no 90degree angle. Get the right one from Roger, they're cheap anyway!
Just cap it off for the meantime as you are introducing a leak to the system.
Just cap it off for the meantime as you are introducing a leak to the system.
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From: North Country
Thanks guys, but the mystery goes on. I'm still looking for one item in the engine compartment that needs vacuum. I already hooked up the flappy, reservoir and HVAC vacuum lines but have 1 more small line to hook up its the one that comes off the small check valve at a 90 dregee. please look at my pic's
Thanks again
Thanks again