2nd Generation Specific 1986-1992 Discussion

AFM Won't Respomd. Help!

Old 05-22-2013, 09:25 PM
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Default AFM Won't Respomd. Help!

I have a 1986 S4 N/A RX that I've been slowly getting to run since November. I've got it to the point where I can start the car but I can't drive it. The only way the car will start is if I hold open the flap on the AFM to let air in. I talked with a local guy that knows a little more about rotaries than I do, and he said the AFM is bad and I need a new one. I bought a brand new one (autopartswarehouse) and installed it and I have the same problem, won't start unless I prop open the flap, and if I take out the prop the engine dies.

Possibly unrelated, but it smokes A LOT when I start it (I've started it twice this way for a few minutes each, it never gets fully warm). There is no coolant missing and only a small amount of oil is gone so I assume that this is the infamous oil burning I've heard about since the car has been sitting around for around a year.

Here is where I need your help. What am I missing? There is only one thing I can think of, and that is in the photo attached to this post. There is one wire missing from the plug in that goes into the AFM.

Attached is a view of the afm plug in when it is attached. I did the test on the AFM as per the service manual (Page 4A 54, S4 service manual) and here is the results.

E2 - VS (Suppose to be 50-500 ohms) I got 330 ohms
E2 - VREF (Suppose to be 200-500 ohms) I got 280 ohms
E2 - THA (Dependent on temperature, measured at 78 degrees F) I got 1721 ohms
E1 - FC (Suppose to be ∞) I got ∞

Now for the flap
E1 - FC fully closed (Suppose to be ∞) I got ∞
E1 - FC fully open (Suppose to be 0) I got 0
E2 - VS fully closed (Suppose to be 50-500 ohms) I got 310 ohms
E2 - VS fully open (suppose to be 50-500 ohms) I got 84 ohms

Suggestions? Ideas? I'm stumped. Like I said in the previously the car will only start if the flap is propped open, and if I take the prop out the engine dies.
Attached Thumbnails AFM Won't Respomd. Help!-0519131838.jpg   AFM Won't Respomd. Help!-0520131830.jpg  
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Old 05-23-2013, 08:54 AM
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Default Re: AFM Won't Respomd. Help!

Will it stay running if you give it gas?

What color/smell is the smoke?
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Old 05-23-2013, 06:32 PM
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Default Re: AFM Won't Respomd. Help!

Smoke is whitish color and I don't notice any smells. Engine dies if I rev high enough otherwise when I rev it sputters. Idling is perfectly fine other than the smoke. I'm not seeing any missing coolant only a little oil gone.
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Old 05-24-2013, 07:50 AM
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Default Re: AFM Won't Respomd. Help!

White is usually indicative of burning coolant, usually smells sweet. Gray is oil, black is excess fuel.

Have you done a compression test?
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Old 05-27-2013, 12:28 AM
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Default Re: AFM Won't Respomd. Help!

Originally Posted by Baldy View Post
White is usually indicative of burning coolant, usually smells sweet. Gray is oil, black is excess fuel.

Have you done a compression test?
I haven't done a compression test because I don't have a second body to help, but when I do I will. I don't think it is burning coolant there isnt any missing, but there is a small amount of oil missing. I know it isn't leaking because the oil has been sitting in there for around a month without the level dropping. I've only started it in the evening hours so it might have been grey/white it is difficult to tell in poor lighting conditions
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