Secondary Throttle Operation
08-21-03, 03:12 PM
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Secondary Throttle Operation
I have a 1988 RX7, none turbo, which is a beautiful car, but has no *****. Have a manual coming, but not in hand. Convinced the "secondary throttle" system, if that's what it's called, doesn't open up. Anyone have a way to test, diagnose this system? Have VOM, and plenty of tools. The engine seems to run fine at partial throttle operation, no missing, gas milage is seemingly normal, Idle good, all tune up parts new, or recent.
When you accelerate at full throttle, would say 1995 Mazda 626 5spd I used to have would beat it to 70MPH with no problem. Certainly a lot slower on accel than 74 RX4 I used to own. I do notice if you punch it hard, go to 6000 rpm, let off, wait a momenr, hit it again, brief surge of extra power, but goes away, back to what it always accel like.
pro4art@core.com if you want to email off list
When you accelerate at full throttle, would say 1995 Mazda 626 5spd I used to have would beat it to 70MPH with no problem. Certainly a lot slower on accel than 74 RX4 I used to own. I do notice if you punch it hard, go to 6000 rpm, let off, wait a momenr, hit it again, brief surge of extra power, but goes away, back to what it always accel like.
pro4art@core.com if you want to email off list
08-21-03, 03:40 PM
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Well, try to move the secondary throttle blades by hand. If they move, then they aren't stuck. If they aren't stuck, apply vacuum to the actuator. The throttles should open. If they do, I'd say your fine. You should also test the vacuum thermo switch. Follow the vacuum line from the secondary throttle actuator to where it meets the vacuum thermo switch at the back of the manifold. Remove the line from the manifold to the switch. Apply vacuum with car cold. Throttles should not move. Now fully warm up the car and apply vacuum. Throttles should open.
08-22-03, 10:24 AM
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Secondary Thrrotle operation
Originally posted by Aaron Cake
Well, try to move the secondary throttle blades by hand. If they move, then they aren't stuck. If they aren't stuck, apply vacuum to the actuator. The throttles should open. If they do, I'd say your fine. You should also test the vacuum thermo switch. Follow the vacuum line from the secondary throttle actuator to where it meets the vacuum thermo switch at the back of the manifold. Remove the line from the manifold to the switch. Apply vacuum with car cold. Throttles should not move. Now fully warm up the car and apply vacuum. Throttles should open.
Well, try to move the secondary throttle blades by hand. If they move, then they aren't stuck. If they aren't stuck, apply vacuum to the actuator. The throttles should open. If they do, I'd say your fine. You should also test the vacuum thermo switch. Follow the vacuum line from the secondary throttle actuator to where it meets the vacuum thermo switch at the back of the manifold. Remove the line from the manifold to the switch. Apply vacuum with car cold. Throttles should not move. Now fully warm up the car and apply vacuum. Throttles should open.
Hope that fixes it, as I might keep it, rather than sell it
Beginning to bug me, as only have 1250 miles on it since May 2002, and I ought to sell it, and my Peugeot and Volvo wagons. RX7 is a "Garage Queen" and only been in rain maybe 6 times in last 4 years. With all the bad weather here in Ohio, never get to drive it.
Insurance is a bitch, as also have a V6 Stick Hyundai that my wife drives.
08-22-03, 11:20 AM
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Originally posted by Aaron Cake
Well, try to move the secondary throttle blades by hand. If they move, then they aren't stuck. If they aren't stuck, apply vacuum to the actuator. The throttles should open. If they do, I'd say your fine. You should also test the vacuum thermo switch. Follow the vacuum line from the secondary throttle actuator to where it meets the vacuum thermo switch at the back of the manifold. Remove the line from the manifold to the switch. Apply vacuum with car cold. Throttles should not move. Now fully warm up the car and apply vacuum. Throttles should open.
Well, try to move the secondary throttle blades by hand. If they move, then they aren't stuck. If they aren't stuck, apply vacuum to the actuator. The throttles should open. If they do, I'd say your fine. You should also test the vacuum thermo switch. Follow the vacuum line from the secondary throttle actuator to where it meets the vacuum thermo switch at the back of the manifold. Remove the line from the manifold to the switch. Apply vacuum with car cold. Throttles should not move. Now fully warm up the car and apply vacuum. Throttles should open.
I plugged the Vaccumme line on mine and they now stay open all the time.
Have you checked the secondary plates that are opened by the throttle linkage. I found mine were not opening soon enough and had to readjust.
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