Yet another AFM (?) problem
03-21-07, 01:39 PM
#1
Senior Member
Thread Starter
Join Date: Nov 2004
Location: Houston
Posts: 372
Likes: 0
Received 0 Likes
on
0 Posts
Yet another AFM (?) problem
Ok, now I have seen this thread pop up many times, but I need some conclusive findings. I finished putting her back together after vacuum rack removal, fresh gaskets, fresh hoses, etc. and now she starts and dies. As far as I understand, it could be one of 2 things (but this is why I am posting, right?): Huge vac leak, or AFM. When I put it back together it is possible I overlooked something, but I triple checked everything, and it is as it should be (more on that later). When I tested the AFM (in accordance to what I found upon searching) E2->Vs should read 200-600 closed, and 20-1000 fully open. While opening and checking I observed that the values were nonlinear (they bounced around). Does this indicate a bad AFM?
Major second question:
I have seen many vac routing diagrams for vac rack removal, and they seem to differ greatly. I can attach the ones I have, so you can see what I am dealing with. I need to know which one to use. I think the PCV part is the most confusing. Thanks in advance. (88 T2 btw)
Major second question:
I have seen many vac routing diagrams for vac rack removal, and they seem to differ greatly. I can attach the ones I have, so you can see what I am dealing with. I need to know which one to use. I think the PCV part is the most confusing. Thanks in advance. (88 T2 btw)
03-21-07, 02:42 PM
#2
Seduced by the DARK SIDE
Join Date: Apr 2001
Location: Orange Park FL (near Jax)
Posts: 7,323
Likes: 0
Received 2 Likes
on
2 Posts
The sweep in values as you open the AFM is in steps.
They gradually go up to near wide open, then they level off & fall back a little.
If there are dead spots or drop-outs in the sweep - it's bad.
At least, if it's an S4, you can clean the contacts.
They gradually go up to near wide open, then they level off & fall back a little.
If there are dead spots or drop-outs in the sweep - it's bad.
At least, if it's an S4, you can clean the contacts.
03-21-07, 03:19 PM
#4
Seduced by the DARK SIDE
Join Date: Apr 2001
Location: Orange Park FL (near Jax)
Posts: 7,323
Likes: 0
Received 2 Likes
on
2 Posts
#1 Keeps the charcoal canister purge. Some like keeping it.
#2 Ignores the oil sump vent.
#3 Is like I did my S5. The fuel pressure regulator gets it's pressure from behind the throttle plates for better mileage, or in front of the throttle plates for big fireballs when shifting.
#2 Ignores the oil sump vent.
#3 Is like I did my S5. The fuel pressure regulator gets it's pressure from behind the throttle plates for better mileage, or in front of the throttle plates for big fireballs when shifting.
03-21-07, 04:59 PM
#5
Senior Member
Thread Starter
Join Date: Nov 2004
Location: Houston
Posts: 372
Likes: 0
Received 0 Likes
on
0 Posts
Also, #3 ignores the twin scroll actuator, which is one thing I am keeping. Also, what do I do with the hose coming from the bottom of the canister? I believe I am supposed to keep that one open, but I am not totally sure. Anyway, all of this confirms my deepest fear: huge air leak... 
..... Guess its time for an air compressor and some soapy water.... Thanks for the help though. Also: on my AFM there are 4 or 5 huge sweeps as I open it, I am guessing this is what you mean. Nothing falls to zero, so I think I am OK. Maybe I can get some local help, and borrow an AFM. I am gonna test out my N/A AFM to see if the values are similar. I know I can't use it for the T2, but maybe I can get a better Idea on how these things work.
..... Guess its time for an air compressor and some soapy water.... Thanks for the help though. Also: on my AFM there are 4 or 5 huge sweeps as I open it, I am guessing this is what you mean. Nothing falls to zero, so I think I am OK. Maybe I can get some local help, and borrow an AFM. I am gonna test out my N/A AFM to see if the values are similar. I know I can't use it for the T2, but maybe I can get a better Idea on how these things work.
Thread
Thread Starter
Forum
Replies
Last Post
The1Sun
1st Generation Specific (1979-1985)
7
09-18-15 07:13 PM
