BEFORE YOU BEGIN

Make sure that your throttle body box came with the following parts:

Make sure that you have the following tools available:

You will also need to have access to a DIGITAL MULTIMETER so that you will be able to "set" the TPS sensor onto the new STR Throttle Body.

These instructions are for performing the installation on a factory (STOCK OEM) intake manifold.

	FAMILIARIZE YOURSELF FIRST WITH THE TWO SENSORS YOU WILL BE WORKING WITH. The two sensors are the TPS (Throttle Position Sensor) and the MAP (Manifold Air Pressure) sensor.  It might be a good idea to label each plug before you unplug them so you do not get them confused with each other.  They share IDENTICAL plugs, and they plug into each other's sensor.  The engine will not idle or run properly with these two plugs mixed up.
	Unplug both 3 wire plugs from the MAP sensor and the TPS sensor.
	Using a Philips screwdriver, unscrew the two screws holding the MAP sensor down.
	Be careful not to lose the factory O-ring.  You will use it again later.
	Disconnect the throttle cable from the factory throttle body.
	Carefully disconnect any intake piping you may have.
	Using a 12mm wrench, unbolt the factory throttle body.  There are two bolts and two studs.
	ENGINE COOLANT MAY BE HOT!!!  Using a good set of pliers, disconnect the factory coolant lines that come from the throttle body.
	ENGINE COOLANT MAY BE HOT!!!  Using a good set of pliers, disconnect the factory coolant lines that go INTO the throttle body.
	Using the supplied brass union, connect the two hoses together so that the engine coolant can flow through the system.  You may use the factory hose clamps, or use a pair of your own.
	Use the factory o-ring and place it in the groove in the new STR throttle body for the MAP sensor.  If you are going to place a bolt to plug the hole, use silicone sealant as well to ensure a leak-proof plug.
	Screw the MAP sensor onto the new STR throttle body using the factory screws.
	Use a good set of duck bill pliers and clamp onto the edges of the screws that retain the factory TPS sensor onto the factory throttle body.  Use extra care while doing this! (The screws appear to be rivets, but none the less, they are screws)
	Put the factory TPS sensor onto the new STR throttle body.  Make sure that the trigger inside is in between the groove on the STR throttle body.  Use the provided hardware to bolt it back on.  Don't tighten the screws just yet.  Just tighten them enough so that it can still be rotated around a little, and so that it will not simply fall out.
	On certain applications, you may have to trim the factory wire loom a little so that the MAP sensor plug can reach the new position that it is in with the STR throttle body.  Carefully perform this procedure, and ensure that you do not accidentally cut any wires!
	Using a single edged razor blade, remove any remnants of the factory throttle body gasket from the intake manifold.  Use a ScotchBrite pad to finish off what the single edge blade left off.  Use the PROVIDED SCENTED GASKET and bolt the new STR throttle body back on the intake manifold.
	Re-connect the intake piping.

• ADJUSTING THE TPS SENSOR

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• On the factory TPS sensor, there are 3 wires.  The center wire is “regulated voltage”. At CLOSED 
  throttle check the voltage reading of the center wire. The reading should be between 0.44 - 0.50 volts. Rotate the sensor clockwise or counter-clockwise until the reading falls within that range. Tighten the two screws. At WOT, the reading should be between 4.50 - 4.85 volts. Make adjustments as necessary.  

If you require more adjustment, you can remove the metal inserts on the TPS and that will allow you to rotate the sensor even further.

• After you are done adjusting the TPS sensor, go ahead and tighten the two screws holding it down.
   

• PRE-START CHECKLIST
  
  Do NOT connect the throttle cable onto the STR throttle body just yet!  You would want to start the engine first to see if the throttle body was properly installed.  Don't worry -- having the throttle cable disconnected will not affect how the engine will idle.
  
  START THE ENGINE
  
  Immediately shut the engine off if it revs on its own past 2,000 RPM!  Check and see if the small set-screw for the throttle wheel is backed out so that the butterfly in the throttle body can completely close.  Start the engine again.  Adjust the idle speed by turning the idle-air bleed screw and/or the throttle wheel stop set screw.  On a stock-ish engine, you would want the idle speed to be around 700-1000 RPM.  On a modified engine, the idle speed may be compromised a little.

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• START THE ENGINE AGAIN

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• If the problem persists, check around the base of the throttle body and make sure that it is properly seated onto the intake manifold.  Make sure that you did not accidentally trap any wires, or any other foreign object  beneath it and sandwiched it between the throttle body and intake manifold.

• Also, check and make sure that you did not mix up the two plugs for the TPS and the MAP sensor.  
  
  If there are no problems, your engine should smoothly idle and your installation was successful!

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• COMPLETE THE INSTALLATION BY CONNECTING THE THROTTLE CABLE TO THE THROTTLE BODY.  MAKE SURE THAT YOU HAVE AN ADEQUATE AMOUNT OF "SLACK" IN THE CABLE. 
   

  Reconnect the factory throttle cable, and your installation is now complete!

  
  RACE PROVEN...
  
   

  This throttle body eliminates the factory coolant passages.

  The MAP sensor port is tapped so that it can be easily blocked off with a standard bolt for high performance applications.

  Throttle body butterfly shaft is black oxide coated and revolves around two sealed ball bearings for a worry free application.

   

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  The STR throttle body was designed for high performance applications.

OTHER INFORMATION:

1. 1.  The two MAP sensor port is threaded 1/4-20 SAE

2. 2.  The STR throttle body is primarily constructed out of high-grade 6061 aluminum

3. 3.  All components, packaging, and the STR throttle body itself are proudly made in the USA.

FREQUENTLY ASKED QUESTIONS

Can the STR throttle body be used for street cars?

Yes, the STR throttle body is "streetable".  It has no provision for cruise control.  It also does not have engine coolant running through it -- may cause problems in areas with extremely cold climates.

Can the STR throttle body be serviced?

Although it is very unlikely for the throttle body to require "service", it still can be done.  So, yes, the STR throttle body can be serviced.  We advise that you send your throttle body in to be serviced here at STR so that we may remedy whatever problem you may be experiencing.  

Can the STR throttle body be made available in custom colors and finishes?

We manufacturer our throttle bodies completely in-house.  On special requests, we can pull a throttle body off the production line and accommodate your needs.  We charge a nominal fee to perform such a service.  Throttle bodies can be anodized a variety of colors.   We do request a 14 day lead-time.  

Will the throttle body cause my check engine light to turn on?

From our testing, the only "check engine" light that can possibly be affected by the throttle body would be because of the mis-positioning of the TPS sensor.  Scroll up and review the instructions on how to "clock" the TPS sensor so that you will not trigger a check engine light.

I think I have a defective throttle body.  What can I do?

On rare occasions, a defective throttle body will accidentally get sent out.  Several times, you can remedy the problem yourself, and we can help you do so over the phone.  We are all proud of our products and stand behind them firmly.  We offer a limited lifetime warranty on our products, so we will try our very best to ensure that you have spent your money wisely. 

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