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[Guide] How to clean throttle body (2.0 petrol)

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Old Jan 19th, 2018, 23:11   #1
StatusRed
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Last Online: Yesterday 22:38
Join Date: Jul 2015
Location: Glasgow
Post [Guide] How to clean throttle body (2.0 petrol)

I recently cleaned out the throttle body on my 2009 2.0 petrol S40 and thought I'd write up a guide for anyone else interested in doing it. I assume this would be very similar for the 1.8 petrol engine but I'm not sure about the others. Access was very easy for my engine.

Before:




After:



Tools required:
  • 7mm spanner or socket
  • 8mm spanner or socket
  • Flathead screw driver
  • (OPTIONAL) Torx screw drivers (torx 15 or 20 IIRC)
  • Throttle body cleaner
  • Rag
  • Toothbrush

Steps:
  1. Open up the bonnet and take off the engine cover, the throttle body is at the front of the engine bay, made of aluminium and connected to the airbox by a wide flexible rubber hose
  2. Use either the 7mm spanner or flat head screwdriver to undo the two jubilee clips either end of the flexible hose from the airbox to the throttle body
  3. One loosened wiggle the flexible hose at either end and remove it entirely from the engine bay (this can take a bit of force to slide it free but it will come free)
  4. Slide the rag underneath the gap between the throttle body and airbox (hopefully this will catch any screws if they fall out when unscrewing the throttle body)
  5. Use the flathead screw driver to unclip the electrical connector on the throttle body
  6. Undo the 4x 8mm bolts on the throttle body, a bracket will come away at the bottom (don't lose this and memorise the way it fit onto the throttle body)
  7. Take the throttle body out and it should expose the intake into the engine, I placed some clingfilm over this and the airbox (probably an over the top precaution but I was paranoid about something getting inside it)
  8. (OPTIONAL) Remove the plastic enclosed electrical unit held onto the side of the throttle body with torx (torx 15, or 20 I think) screws (I didn't have the correct torx bit at the time, so didn't do this step which is meant to be precautionary so the throttle body cleaner doesn't damage electrical parts)
  9. Spray throttle body cleaner onto both sides of the throttle body and over the flap, agitate it with the toothbrush and wipe with the rag (it took a long time to get the crud shifted on my throttle body, it was really baked on but be persistent and eventually it will clean)
  10. Once clean, wipe the rubber seal too to ensure its clean
  11. Allow to dry
  12. (OPTIONAL) Reconnect the electrical plastic enclosed unit with the torx screws
  13. Refit into the car, ensuring the bracket at the bottom is in the right position, tightening up to the same as before (this isn't ridiculously tight)
  14. Reconnect the flexible air hose and tighten the jubilee clips (there are groves in certain positions that line up with the airbox and throttle body so it should be obvious how it fits)
  15. Reconnect the electrical connector to the throttle body
  16. Start the engine with the bonnet still up to listen for any air leaks, check the engine revs correctly and as expected with accelerator input



Extra notes:
  • I applied silicone grease to where the flexible hose connects to the airbox and throttle body to make it easier to remove in future (probably totally unnecessary)
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2009 S40 SE Lux 2.0i | 2022 Suzuki V-Strom 650 | 2002 Audi TT 225


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clean, maintenance, throttle, throttle body


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