Shutter valve gone and I'm dancing in the street
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Shutter valve gone and I'm dancing in the street
Ok, turns out my shutter valve is bad. I was checking it because a Mazda mechanic told me that if your car doesn't hold idle with the A/C on, it's like the valve.
So I took the big shutter valve hose off, cut it in half and filled the ends with JB weld.
She idles perfect now, no more lobing. When I click the A/C on, she idles up to 1000 rpm's perfectly smooth. (Also replaced the idle compensation mushroom with another one since the old one was sticky).
So, for now, I can't afford a new shutter valve so I am going to run with the plugged hoses.
Here's the differences:
Backfires - Gone
Hesitiation - Gone
Fluctuation in cruise/idle/mixture ratio (have lambda sensor) - Gone
Fear of taking a date out in my 7 - Gone
So I took the big shutter valve hose off, cut it in half and filled the ends with JB weld.
She idles perfect now, no more lobing. When I click the A/C on, she idles up to 1000 rpm's perfectly smooth. (Also replaced the idle compensation mushroom with another one since the old one was sticky).
So, for now, I can't afford a new shutter valve so I am going to run with the plugged hoses.
Here's the differences:
Backfires - Gone
Hesitiation - Gone
Fluctuation in cruise/idle/mixture ratio (have lambda sensor) - Gone
Fear of taking a date out in my 7 - Gone
#4
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Anyone know if the shutter valve is specific to a carburated rotary? I mean, I guess that would limit them to just 12a's, but you can always put injection on one....
Just curious.
Just curious.
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Ya it's specific to carbureted. The FI's can turn the 2nd set of injectors on and off at will so they don't need it.
So we'll see how my mileage is now. I don't know why they felt the need for that shutter valve. When I let up on the gas my primaries close anyways reducing airflow and hence Bernoulli's vacuum. Oh well, I am sure their was a reason why, just can't seem to find it
So we'll see how my mileage is now. I don't know why they felt the need for that shutter valve. When I let up on the gas my primaries close anyways reducing airflow and hence Bernoulli's vacuum. Oh well, I am sure their was a reason why, just can't seem to find it
#6
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When the shutter valve died on the 83 I put a plug in the appropriate hole in the aircleaner well. It solved the problem, but I think my gas mileage dropped noticeably.
B
B
#7
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Originally posted by bliffle
When the shutter valve died on the 83 I put a plug in the appropriate hole in the aircleaner well. It solved the problem, but I think my gas mileage dropped noticeably.
When the shutter valve died on the 83 I put a plug in the appropriate hole in the aircleaner well. It solved the problem, but I think my gas mileage dropped noticeably.
I plugged mine and my gas mileage stayed the same. I'll bet your MPG problem is related to something else.
--Bob
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Originally posted by inittab
Make sure there is no way for that plug to pop out and go down the carb.
I plugged mine and my gas mileage stayed the same. I'll bet your MPG problem is related to something else.
--Bob
Make sure there is no way for that plug to pop out and go down the carb.
I plugged mine and my gas mileage stayed the same. I'll bet your MPG problem is related to something else.
--Bob
Maybe I have some fuel problems with the 83. Now, when I start it there is about 10 secs of stumbling like it's starved before it runs smoothly: hot or cold. Could it be a vacuum line problem? I don't think it's an ignition problem. So far it's just a minor annoyance.
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