2000 Chevrolet Camaro SS, 2D Coupe, AutomaticFACTORY OEM SERVICE PROCEDURE

Test 16: Metro

  1. With engine cool, ensure EGR valve is not loose or broken. Replace as necessary. Start engine and warm to normal operating temperature.
  2. Place finger on bottom of EGR valve diaphragm. Increase engine speed. EGR valve diaphragm should move. If diaphragm does not move, allow engine to idle. Disconnect vacuum hose from EGR valve. See Fig 1.
  3. Apply 8 in. Hg of vacuum to EGR valve and place finger on diaphragm. Vacuum should hold, diaphragm should move and engine should run rough and may stall. If EGR valve operation is as specified, go to next step. If EGR valve operation is not as specified, replace EGR valve.
  4. Check for carbon in valve which may cause a restriction. Restriction may be small enough so that engine may not stall, but large enough to cause DTC P0400 to set.
Fig 1: Identifying EGR System Components
G96I09863Courtesy of GENERAL MOTORS CORP.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.