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Mudd
Joined: 27 Aug 2012
Posts: 78
Location: Cincinnati,Ohio
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 Posted: Fri Jul 12, 2013 1:07 am Post subject: A/F |
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Where is the A/F mixture adjusting screw on a 1978 924.
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1978 924
1987 944 |
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staticsan
Joined: 19 Jan 2009
Posts: 450
Location: Sydney, Australia
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| Posted: Fri Jul 12, 2013 4:48 pm Post subject: |
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It's down inside the air-mass meter, underneath the fuel distributor. There's a port to get to it between the boot over the meter plate and the fuel distributor. You will need a 3mm Allen key that is at least 6 inches long.
The Haynes book tells you in more detail, including pictures.
Wade.
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'82 British NA - Which I think I've been very lucky with! |
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scriblz7
Joined: 07 Dec 2008
Posts: 112
Location: kirkland WA.
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| Posted: Fri Jul 12, 2013 6:34 pm Post subject: |
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do not go adjusting your mixture unless you know you have no vacuum leaks, and you have the correct fuel control and system pressures. it will just make things more wonky.
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Riley
79 924 n/a with gt body
15 VW GTI |
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ThomasJoseph315
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| Posted: Fri Jul 12, 2013 6:55 pm Post subject: |
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| You really don't wanna fiddle with this thing unless you know what your doing. As scribles said, check for vacuum leaks. I had leaks all over. Check the injector seals, and the warm up injector gasket, and of course vacuum lines. Get a can of brake cleaner and go nuts. Trying to make your A/F work for you when you got leaks is pointless. Also, when adjusting, I have installed a A/F gauge in my car. I suggest you do the same. Total cost for me was under $150 for a narrow band. $50ish for gauge, $20 for O2 sensor, and $60 to weld it in. I would be lost without this little guy. I may just upgrade to a wide band one soon, prolly next month. |
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Mudd
Joined: 27 Aug 2012
Posts: 78
Location: Cincinnati,Ohio
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| Posted: Sat Jul 13, 2013 12:54 am Post subject: |
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I am going to clean my WUR and I have been screwwing with the air bypass screw, so after the WUR is clean I figure I will have to adjust something to get my idle correct. I replaced all of the vacuum lines and am pretty confident I don't have any vacuum leaks.
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1978 924
1987 944 |
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ThomasJoseph315
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| Posted: Sat Jul 13, 2013 3:04 am Post subject: |
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| Mudd wrote: | | I am going to clean my WUR and I have been screwwing with the air bypass screw, so after the WUR is clean I figure I will have to adjust something to get my idle correct. I replaced all of the vacuum lines and am pretty confident I don't have any vacuum leaks. |
I cleaned mine without disassembling it, but check the heater for ohms. I would pull the screens out on the larger line, mine had 5 screens that where all clogged up. Then you'll see the small holes where the gas goes though. Blast that thing with car/brake cleaner. Mine was definitely clogged as it took a few times then I seen a ton of black grime come out.
Good luck! |
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scriblz7
Joined: 07 Dec 2008
Posts: 112
Location: kirkland WA.
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| Posted: Sat Jul 13, 2013 7:52 am Post subject: |
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like i said earlier, once your wur is clean you will have to check your fuel system and control pressures. those will more than likely be out of spec. get those in spec and then if you have to can mess with the idle control on the throttle body and the a/f ratio.
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Riley
79 924 n/a with gt body
15 VW GTI |
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Brockoli
Joined: 06 Feb 2007
Posts: 621
Location: Edmonton, Alberta, Canada
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| Posted: Sat Jul 13, 2013 11:44 am Post subject: |
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i bought the innovate mtx-l wideband o2 sensor. i think i paid about $180 for it. heres an ebay listing for one...
http://www.ebay.ca/itm/INNOVATE-3844-MTX-L-DIGITAL-WIDEBAND-AIR-FUEL-GAUGE-KIT-/370520832034
It is easy to install especially if your car came with an O2 sensor, my '80 did. This sensor is pretty good, it even can output a narrow band signal that you can wire back into the fuel system to keep the frequency valve operational. I didnt, I think when the frequency vavle is unplugged the car runs 50:50, meaning it doesnt lean out or get richer, which was nice for tuning as I just adjust the fuel mixture screw.
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'80 924 M471,Wideband O2, Full coilover susp,23/19 sways,Bilstiens,KLA Strut Brace,Roll Bar,Test Pipe,BBS RS, Willwood BBK
25% of a '87 944 Chumpcar http://straightpipe.ca/forums/showthread.php?t=2454
'79 924 Sebring Edition(Sitting) |
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staticsan
Joined: 19 Jan 2009
Posts: 450
Location: Sydney, Australia
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| Posted: Mon Jul 15, 2013 8:04 pm Post subject: |
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| scriblz7 wrote: | | do not go adjusting your mixture unless you know you have no vacuum leaks, and you have the correct fuel control and system pressures. it will just make things more wonky. |
Oh yes. Adjusting mixture and idle speed is an iterative process, too. Change one, and you will probably need to move the other. And _any_ vacuum leaks will mean changed to either mix and idle pointless at best and highly dangerous at worst.
Wade.
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'82 British NA - Which I think I've been very lucky with! |
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