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McMichem
Joined: 26 Jun 2015
Posts: 38
Location: Buffalo NY
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 Posted: Fri Jun 26, 2015 12:04 pm Post subject: Check out my first Porsche. 1980 931 :) |
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I had posted on rennlist a while back, ended up buying a 924 turbo.
Needs an ignition switch and a timing belt just to be safe, then I'll find out what exactly I bought.
So here it is:
1980 931 with 67k miles
Absolutely no rust, newer paint job done last year by the owner (owned a bodyshop).
Interior is decent for what it is.
Here is where I could use some help, the option code sticker is not in the back...
It has the 5 lug wheels + discs, electric mirrors, Looks like AC, rear wiper... so it seems like the owner spared no expense and got everything. I don't have a jack so I can't see if it has the LSD yet but I assume it does.
Here are my questions:
I hear a whining near the transmission as well as near the intake as soon as i hook up the battery, what do you think this is?
Is there anywhere else on the car that lists the options?
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bradito
Joined: 04 Aug 2011
Posts: 63
Location: Iowa
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| Posted: Fri Jun 26, 2015 12:44 pm Post subject: |
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Congratulations and welcome to the forum! You will find an abundance of information here from extremely knowledgeable folks who are usually more than happy to help (I have found in my experience). Also a lot of information has been posted before so if you do an advanced google search on this site you will find lots of posts relevant to what you may be searching for. Once you get a jack I know I have seen somewhere on here before that if you can get the numbers off the bottom of your transmission you should be able to figure out what kind it is. I don't know how to do that but there are other peeps on here who can! You may even be able to send the VIN to Porsche and find out what all options your car has. They keep pretty extensive records from what I can tell. Hard to say what the whining is but the fuel pump can make a "whining" sound, but it shouldn't engage as soon as you hook up the battery...
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1982 924
1981 931 |
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Fasteddie313
Joined: 29 Sep 2013
Posts: 2595
Location: MI
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| Posted: Fri Jun 26, 2015 1:13 pm Post subject: Re: Check out my first Porsche. 1980 931 :) |
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| McMichem wrote: | I had posted on rennlist a while back, ended up buying a 924 turbo.
Needs an ignition switch and a timing belt just to be safe, then I'll find out what exactly I bought.
So here it is:
1980 931 with 67k miles
Absolutely no rust, newer paint job done last year by the owner (owned a bodyshop).
Interior is decent for what it is.
Here is where I could use some help, the option code sticker is not in the back...
It has the 5 lug wheels + discs, electric mirrors, Looks like AC, rear wiper... so it seems like the owner spared no expense and got everything.
How about headlight sprayers? Sport seats you don't have or a power antenna, if you want a power antenna I won't be using mine..
I don't have a jack so I can't see if it has the LSD yet but I assume it does.
Mine is just like yours and has LSD
Here are my questions:
I hear a whining near the transmission as well as near the intake as soon as i hook up the battery, what do you think this is?
Well that sounds like the fuel pump running and the injectors spraying.. This should in no way happen as soon as you put the battery on but there are logical reasons it could be happening..
1. your fuel pump power must be jumped, It is common to do for diagnosis, check your fuel pump relay (2nd from left top row iirc, long one) for a jumper on it between pins 30-87, or some other manual method of powering the fuel pump, the fuel pump should not run unless the fuel pump relay sees a tach signal so it knows the engine is running, the overboost switch needs to be grounded, and accessory power (key on)
But it is very common to jump all that for CIS diagnosis to just run the pump for tests and it may well have been left jumped for you to find..
2. The injectors should not be spraying while the fuel pump is jumped and the engine not running, the air metering plate connected to the fuel distributor should have to be moved slightly for the injectors to spray..
Once again there are logical reasons they very well could be spraying.. If you adjust the AFR/air fuel ratio/CO adjustment too rich the injectors will spray before the plate moves, its a 3mm allen screw down in that hole between the fuel distributor head and the rubber boot that covers the air metering plate, The hole needs to be covered to run or its a vacuum leak.... A good base setting for it is rich just until the injectors spray with the plate not moved (pumps jumped) and then back just until the injectors stop spraying..
If this is true change your oil immediately after you get it to stop because your oil will be full of gasoline from the injectors dumping fuel in your engine while it's not burning it and it winds up in your crankcase, very bad for bearings....
If this is not true I'll be a monkeys uncle..
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Nice car I'm excited for you!! Same as mine and I love it..
Looking at your pics...
OPTIONS: You have rear defrost and obviously forged fuchs wheels, 3 spoke 930 steering wheel but not exclusive (real crest), turbo center between tail lights, you have some neat pin striping as well and no belt line trim..
Look your fuel distributor - airbox boot covering the metering plate is already half off for you, And a spark plug wire off, said overboost switch is just above the spark wire, it needs its wire or the wire must be grounded for the fuel pump relay to work..
You need airbox straps, and to replace any of those braided cloth hoses on vacuum circuits or tuning is a waste of your time, ok maybe not a complete waste but these are extremely sensitive to vacuum leaks..
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80 Turbo - Slightly Modified |
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morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
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| Posted: Fri Jun 26, 2015 4:59 pm Post subject: |
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looks rather decent. with a bit of work it can be a very nice car.
welcome !
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Supercharger and EFI kits
https://www.the924.com |
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McMichem
Joined: 26 Jun 2015
Posts: 38
Location: Buffalo NY
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| Posted: Sat Jun 27, 2015 12:05 am Post subject: |
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Thank you all for the responses!
The plug boot was only off because I took it off a few minutes before. I mispoke about the noise though, it happens when I turn the key to the position just before you crank the engine. The front sounds almost like a hissing coming from the injectors in guessing, and the rear sounds like the fuel pump priming but it doesn't stop, I let it sit there for 2 minutes and it never stopped. I would really like to turn the car over but I'm worried about the timing belt and with my luck it would go right away.
I realized this car would need work when I got it because the "ignition switch" went on it and I couldn't start it before I bought it. I was looking and it has a new starter, dist cap and some other random things so I am kinda thinking they were chasing some type of electrical problem and maybe never found it.
It's at my apartment and not my garage so I don't have my jack, hoping to borrow the neighbors tonight to see if I have lsd. |
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McMichem
Joined: 26 Jun 2015
Posts: 38
Location: Buffalo NY
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| Posted: Sat Jun 27, 2015 1:33 pm Post subject: |
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Against my best judgement I decided to try and turn the engine over and see if the ignition was bad like he said, I know I shouldn't have without changing the timing belt but it looks almost brand new... But anyhow the engine turned over no problem, even though the guy said it wouldn't for him. It must like its new home 
Here's ny issue, must be the injector is stuck because it sits there and whines and so does the fuel pump. It flooded the cylinders and now I have oil in my gas. Where do I go from here? |
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Sat Jun 27, 2015 1:42 pm Post subject: |
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Sounds like the fuel pump relay, on the fuse/relay panel under the dash, has been bypassed so that the fuel pump runs all the time.
This thread should help:
http://www.924board.org/viewtopic.php?t=22724
Its down below in the 931 Tech section.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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Fasteddie313
Joined: 29 Sep 2013
Posts: 2595
Location: MI
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| Posted: Sat Jun 27, 2015 2:25 pm Post subject: |
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| McMichem wrote: |
Here's ny issue, must be the injector is stuck because it sits there and whines and so does the fuel pump. It flooded the cylinders and now I have oil in my gas. Where do I go from here? |
Just as I thaught..
It could be a stuck injector but likely just a misadjusted AFR screw keeping your injectors spraying (like I said), turn that screw in the hole to the left with a 3mm allen and see if they stop spraying..
Unless you think its just 1 injector then it may be a leaking one, if the screw doesn't stop it pull the injectors, put them in bottles, and see what's going on..
If the fuel pump is powered it runs all the time no matter what, it doesn't cycle to keep pressure, it overpressures and is then the pressure is regulated down in the fuel distributor and the WUR/warm up regulator/control pressure regulator (name depends on what book you read),
Turn that screw, check that relay, buy a hanes manual, maybe a CIS pressure tester, read read read, post post post, you can do it..
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80 Turbo - Slightly Modified |
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McMichem
Joined: 26 Jun 2015
Posts: 38
Location: Buffalo NY
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| Posted: Mon Jun 29, 2015 2:28 am Post subject: |
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Finally have half of a day off to mess with my car. I turned the screw out and it is still making noise in the fuel distributor, a lot more with it turned out.
I also checked the fuel pump relay, pulled it out completely out. It is slightly melted and the pump is still running and the fuel dist. Still whining even with it out?? |
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McMichem
Joined: 26 Jun 2015
Posts: 38
Location: Buffalo NY
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| Posted: Mon Jun 29, 2015 2:44 am Post subject: |
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| Correct me if I'm wrong, because I don't know sh*t about wiring... I pulled the fuse box down and looked behind it and the only wire hooked up that hasn't been cut is the green/white. So from what I'm seeing the WUR is powered off of one of those wires, more specifically the red/white. So the WUR has no power and isn't regulating the fuel pressure in the distributor? |
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Fasteddie313
Joined: 29 Sep 2013
Posts: 2595
Location: MI
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| Posted: Mon Jun 29, 2015 4:18 am Post subject: |
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With the pumps running fuel flows into the fuel distributor where it is regulated and returned to tank, fuel also flows to the WUR where it is regulated again and eventually returns to the tank, also the frequency valve should be buzzing, it also regulates fuel pressure in a different area via its duty cycle signal from the Lambda system to fine tune idle/cruise AFR..
The fuel distributor should sound like fuel is flowing through it all the time the pumps are on even with the injectors not spraying, same with the WUR..
The WUR's power is to a bi-metallic heated strip inside of it which bends via temp and adjusts control pressure in relation to strip/engine/heater temperature, this is how it regulates the "Warm Up" aspect of its function, it does not need power to "turn on" and will flow even more fuel with no power actually..
The injectors, on the head, to each cylinder should NOT be spraying while the pumps are running and the "dizzy" and WUR are regulating fuel UNLESS the air metering plate is moved..
The injectors have a distinct whine to them while there spraying, push the metering plate to hear there whine change pitch with flow rate, they should not wine with the plate in the resting position..
As far as the fusebox wiring being all cut and burnt stuff... That sucks, sorry to hear that.. Have fun..
Get a haynes manual for wiring schematics and there is a post around here that helps explain how to understand the wiring diagrams, I suggest just putting everything back to OEM all in one shot and fixing whatever needs fixing..
Here it is...
How To Read 924 Wiring Diagrams
http://www.924board.org/viewtopic.php?t=24683
Hope you got a good deal on the car, I don't think they exist without work needed.. Look on the bright side, at least you don't have to do body work eh?
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80 Turbo - Slightly Modified
Last edited by Fasteddie313 on Mon Jun 29, 2015 4:38 am; edited 1 time in total |
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Fasteddie313
Joined: 29 Sep 2013
Posts: 2595
Location: MI
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