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Throttle Response Cam Instructions

Tools you will need:

13mm wrench – X2
19mm wrench

Tightening the nut on your new throttle cam is very important, over tightening will result in a high idle. Watch the video at the bottom of this page to get the correct torque, and the most enjoyment out of your new part.

Procedure:

1. Open the hood and find the Porsche throttle cam.

Porsche 944 throttle response cam installation

2. Remove the throttle cable before unbolting the cam. Use one hand to hold the throttle cam open, then slide the throttle cable out of the cam.

Porsche 944 throttle response cam installation

3. Remove the 13mm nut from the top of the throttle cam. This nut should NOT be on very tight. When loosening the nut we do NOT suggest loosening it against the throttle body. Hold the cam open halfway and then loosen the nut. This will keep pressure off the internal parts.

Porsche 944 throttle response cam installation

4. Install the throttle cable into your new throttle cam, and slide the new cam onto the throttle body.

Porsche 944 throttle response cam installation

5. Now we need to remove the extra slack in the throttle cable. Loosen the 2 13mm nuts on the throttle cable adjuster.

Adjusting nuts for the early 944 are located on the throttle cable against the firewall. Loosen both jam nuts shown by the red arrow. Then loosen the adjuster nut, green arrow, until the extra slack is removed from the cable.

Porsche 944 throttle response cam installation

Adjusting nuts for the late 944 are located on the end of the throttle cable.

Porsche 944 throttle response cam installation

6. Adjust the nuts on the throttle cable adjuster to remove the slack in the cable.

Caution: Don’t over tighten the cable. This will hold the throttle open when you start the car, resulting in a high idle.

The throttle cable should have a little slack. This allows the throttle body to close all the way, and return the car to a proper idle.

Once the cable is adjusted correctly, tighten the 2 13mm nuts on the cable adjuster.

Porsche 944 throttle response cam installation

7. Install the lockwasher and nut onto the throttle cam.

IMPORTANT: This is very important or your 944 will NOT idle correctly. This nut needs to be installed to the correct torque. Tightening this nut just a little too tight will cause an idle of about 2000rpm. If this is happening with your car, watch the video below and tighten the nut the way we did.

Porsche 944 throttle response cam installation

8. Adjust the plastic stopper bolt under the gas pedal. Press the gas pedal fully down with your hand until it stops. Then loosen the bolt until it comes in contact with the gas pedal. Then loosen it just a little bit more (1/8 – 1/4 turn). Use a 19mm wrench or your fingers to loosen this plastic bolt.

Porsche 944 throttle response cam installation

Porsche 944 throttle response cam installation

Watch this video to properly tighten the nut on a 944 throttle cam.

Why does the throttle cam nut needs to be so loose to work right?

Porsche uses a switch to tell the computer (DME) that the throttle is fully closed. If this switch is not activated, the car will not idle correctly. Tightening the nut on the top of the throttle cam too tight creates some binding inside the throttle body. This slight binding holds the throttle open just a little bit, and will not activate the switch telling the computer to have the car idle at a normal RPM. Instead the car will idle at about 2000RPM.

Another way to see if the nut is the correct tightness, is by listening when the throttle cam is opened and closed. Open the throttle cam by hand, and very, very slowly close it. Close it as gently as you can, while listening. You should hear a clicking noise when it’s fully closed. This is the switch activating. If you can’t hear a click, then the nut might be too tight.

The nut is not on very tight, will it back loose?

We have had no issues with the nut backing loose. But if you are concerned about this, we would suggest a drop of LOW strength loctite on the threads. We do NOT suggest a lock nut. Although this will work, it will be much harder to get the correct tightness, and will be very easy to over tighten.

If you need any help, or have any questions, please email us.