Natro,
What year is your car?
What year car did the AFM's come from? 82 is unique. 83-85 should all be interchangeable.
Has the AFM idle bypass screw been exposed and adjusted?
If you don't know what I'm referring to, see a pic I put up at this address: http://photos.yahoo.com/bc/deanjanderson
Look in the album called "Modifications to Supras", picture number 7.
Here's what I'm thinking....
If the AFM idle bypass screw has been turned to allow a lot of air to get through, then perhaps enough is getting through the AFM to run the car at idle without opening the AFM flapper door. This could mean that the AFM will signal the fuel pump to shut off since the flapper door is closed.
Another simple way to test for proper fuel pump signal coming from AFM is to remove air filter, put key in ignition, turn to on position (without starting the car), then use your finger to barely open the flapper door. When you push it open about a quarter inch, you should hear the fuel pump start up. You'll hear the fuel running through the lines in the engine compartment pretty easily. If you have to push it open a lot, something is wrong with the AFM.
Hope that helps.
What year is your car?
What year car did the AFM's come from? 82 is unique. 83-85 should all be interchangeable.
Has the AFM idle bypass screw been exposed and adjusted?
If you don't know what I'm referring to, see a pic I put up at this address: http://photos.yahoo.com/bc/deanjanderson
Look in the album called "Modifications to Supras", picture number 7.
Here's what I'm thinking....
If the AFM idle bypass screw has been turned to allow a lot of air to get through, then perhaps enough is getting through the AFM to run the car at idle without opening the AFM flapper door. This could mean that the AFM will signal the fuel pump to shut off since the flapper door is closed.
Another simple way to test for proper fuel pump signal coming from AFM is to remove air filter, put key in ignition, turn to on position (without starting the car), then use your finger to barely open the flapper door. When you push it open about a quarter inch, you should hear the fuel pump start up. You'll hear the fuel running through the lines in the engine compartment pretty easily. If you have to push it open a lot, something is wrong with the AFM.
Hope that helps.
