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Throttle Body Cleaning
 

Pelican Technical Article:

Throttle Body Cleaning

Jared Fenton

Time:

1 hour1 hr

Tab:

$0 to $275

Talent:

***

Tools:

Screwdrivers, T30 Torx driver

Applicable Models:

Volvo C30 T5 (2008-13)
Volvo C30 T5 R-Design (2008-13)

Parts Required:

Throttle body gasket

Hot Tip:

Use care when moving the throttle butterfly

Performance Gain:

Smoother running engine

Complementary Modification:

Replace spark plugs

An easy project for the first timer is to clean out the throttle body on your Volvo C30. As the miles build up on your car, the emissions control devices on your engine allow a certain amount of air back into the intake. This air is typically mixed with a combination of carbon and also oil vapors. Over time, this mist leaves deposits on the throttle body, which if not cleaned periodically, can lead to uneven running or even a sticking throttle.

Loosen the hose clamp (green arrow) holding the intake hose to the throttle body.
Figure 1

Loosen the hose clamp (green arrow) holding the intake hose to the throttle body.

Pull the intake hose off the bottom of the throttle body.
Figure 2

Pull the intake hose off the bottom of the throttle body.

Loosen and remove the 8mm bolt (green arrow) holding the upper intake duct to the chassis.
Figure 3

Loosen and remove the 8mm bolt (green arrow) holding the upper intake duct to the chassis. Pull the intake duct up and off the lower elbow piece.

Pull the elbow piece (green arrow) out of the airbox.
Figure 4

Pull the elbow piece (green arrow) out of the airbox. It simply slides out and to the left. Removing the duct will give you more access to remove the bolts.

Now you're ready to remove the throttle body.
Figure 5

Now you're ready to remove the throttle body. Remove the four T30 Torx bolts holding the throttle body to the intake manifold (green arrows, one of the bolts is not visible in this picture). You'll have to feel for the bolt on the rear left hand side. Once the throttle body is removed, turn it over to access the electrical connection.

Press the tabs (green arrows) on either side of the electrical connection and pull it off the clip (yellow arrow) on the throttle body.
Figure 6

Press the tabs (green arrows) on either side of the electrical connection and pull it off the clip (yellow arrow) on the throttle body. You can also see a buildup of carbon and oil sludge on the backside of the throttle body. Clean the deposits off with some carburetor or brake cleaner on a soft, clean rag. You don't want to scratch the surface of the throttle bore or the butterfly. Also keep in mind that the throttle body on the Volvo C30 is electronically operated. There is no direct link between the pedal and the engine. That said, take care when rotating the butterfly. You will encounter a bit of force to move it, but don't force it. You could damage the unit, which is very expensive and requires the factory computer to mate it with the engine.

Here's the same throttle body after cleaning.
Figure 7

Here's the same throttle body after cleaning. You can really see the difference here after a few minutes work. When re-installing the throttle body, use a new seal where it mates to the intake manifold and don't over-tighten the bolts holding it in place. Installation is the reverse of removal.


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Page last updated: Sun 12/10/2017 02:42:14 AM