89 rx7 goes from start to redline
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89 rx7 goes from start to redline
Ok so here's the deal. Every time I start my 89 rx7 non turbo it goes immediately to full throttle...at least it seems...screaming to redline before i have to shut it down. It seems to be running smooth enough, but I can leave it running long enough to really tell. Anyone have any ideas?
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#9
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Double Throttle Diaphragm (looks like a small can with a right angled pipe coming from it that connects to a vacuum hose that runs towards the rear of the throttle body and connects to the white plastic nozzle called the thermovalve). Helps keep secondary throttle plates closed when the engine is cold. Could you perhaps provide a close up pic of the throttle linkage at the front of the throttle body? There is a lever in the horizontal position which rests upon the bottom of a short lengthed screw. It is directly in front of the black cap on top of the throttle body. The lever is part of the secondary plates. When idling it needs to be in the same position as it is in your pic. If it, the lever, drops down just a bit from contacting the screw the idle will increase greatly.
Last edited by satch; 09-09-14 at 09:02 PM.
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The picture above is not actually of my car. i removed that piece from my car because it was faulty and somehow misplaced it. i havent been able to find a replacement for it. here is what my car looks like.
#11
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In your pic the lever, which I speak of, is not in the horizontal position which means the secondary plates connected to the lever is causing these plates to be open when you start the car which will definitely cause the idle to zoom to extremely high levels. You need to rectify this issue and the idle will drop substantially.
#15
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And you need to take care of the vacuum line as well. Normally, there is but one line to the diaphragm but it looks like for yours there are two lines, which likely means the car is/was an automatic as autos have two vacuum lines running to the diaphragm but a standard would only have one (thermovalve has 2 nipples if a standard and three if an auto).
Last edited by satch; 09-10-14 at 09:34 AM.
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My car is a manual, but the motor is a swap from a 91? I think. Very possibly an auto. Should I change that part out or is there anything else I should do?
#17
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The white plastic thermovalve is a key tell as to whether it was from a standard or auto. All you need to do is make sure the lever I speak of is horizontal (and from the looks of it that screw is too long and keeps the lever from springing fully closed but it might just be the pic). The first pic provided illustates how it should look. Besides capping the vacuum line(s), you need to make sure you don't get on the throttle immediately after starting a cold engine and prevent from doing so until the engine has warmed sufficiently.
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