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Checking intake manifold change-over function — AUDI

Checking intake manifold change-over function on Audi: 13 steps, engines AXW, BGU, BHD, BLR. What to remove, in what order, and what to check after.

Checking the intake manifold change-over is a quick vacuum-side test that applies across a large family of petrol engines on the platform codes listed below (8K, 8T, 8F, merged from many variants). The engine cover comes off, the engine idles, and a second person blips the throttle while you watch the vacuum unit move the change-over linkage. If it does not move, the job becomes a check of the vacuum system: leak-tightness, line routing, porous hoses, and whether the mechanism moves freely by hand. Finally the hose to the vacuum unit is pulled at intake manifold flap valve N316 and hand vacuum pump VAS 6213 is used to pull the unit directly. That last step separates a dead vacuum unit from a supply or valve problem, which is what decides whether you renew the unit or chase the hoses.

13 steps 40 engine codes engine codes merged from 20 documented variants

🧭 Before you start

Remove the engine cover, idle the engine and have a helper rev it sharply while you watch the change-over vacuum unit. If it stays still, check the vacuum system for leaks, line connections and porosity, and confirm the linkage moves freely by hand. Disconnect the hose at N316, set VAS 6213 to vacuum (position A) and pump the vacuum unit directly; if it still does not move, renew it. Refit the engine cover.

Fits: Audi A5 Cabriolet (8F), Audi A5 (8T, 2007–2016), Audi A4 B8 (8K, 2007–2015)

  • Renewed: vacuum unit

Don't miss

  • Check the linkage moves freely by hand before blaming the vacuum unit.
  • Set the adjuster ring on VAS 6213 to position A (vacuum) before connecting it.
  • Disconnect the hose at N316 so you test the vacuum unit alone, not the valve.
  • Porous vacuum hoses often pass a visual check; flex them along their length.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

AXWBGUBHDBLRBLXBLYBMBBPUBSEBSFBVYBVZBYTBZBCABACABBCABDCADACAEACAEBCAEDCAWBCBFACCSACCTACCUACCZACCZCCDAACDHACDHBCDLHCDNBCDNCCDZACESACETACFKACGMACHJA

📐 50 workshop diagrams for AXW

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

Checking intake manifold change-over function — AXW · diagram 1
Checking intake manifold change-over function — AXW · diagram 2
Checking intake manifold change-over function — AXW · diagram 3
Checking intake manifold change-over function — AXW · diagram 4
Checking intake manifold change-over function — AXW · diagram 5
Checking intake manifold change-over function — AXW · diagram 6
Checking intake manifold change-over function — AXW · diagram 7
Checking intake manifold change-over function — AXW · diagram 8
+ 42 more diagrams
🔒 50 workshop diagrams for this job Ask about your Audi AXW — free or sign up free to see the drawings

📋 Procedure

  1. Remove engine cover panel .
  2. Start engine and run at idling speed.
  3. Have a second mechanic rev up engine quickly (short burst of throttle) and observe vacuum unit for intake manifold change-over.
  4. Check vacuum system for leaks.
  5. Check that change-over mechanism moves freely by operating linkage manually.
AXW? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Check proper connection of vacuum lines.
  2. Check vacuum hoses for porosity.
  3. Disconnect vacuum hose (1) leading to vacuum unit for intake manifold flap valve N316 at intake manifold flap valve N316(2).
  4. Move adjuster ring (1) on hand vacuum pumpVAS 6213 to position -A- to select "vacuum".
  5. Connect hand vacuum pumpVAS 6213 to vacuum unit for intake manifold flap valve N316.
  6. Operate the hand vacuum pumpVAS 6213 several times.
  7. If vacuum unit does not move, renew vacuum unit.
  8. Install engine cover panel .
Workshop diagrams

Ask TorqFix about your Audi AXW — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.

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Other AUDI procedures

Who makes these pages, and how

TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.

The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.

Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.

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Workshop data on this page last updated 20 Sep 2026.