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Home >> Plymouth >> 1985 >> Turismo Base, 2.2 C, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> 1.6 & 2.2L Feedback Carburetor System >> Testing >> Test 13 - Checking Carburetor Idle System

Test 13 - Checking Carburetor Idle System

  1. Connect tachometer to engine. Remove air cleaner. If equipped, disconnect and plug vacuum hose at solenoid kicker. Start engine, momentarily raise engine speed above 1100 RPM, and then wait 2 minutes for idle speed to stabilize. Plug idle air bleed hole.
  2. Engine speed should drop. If engine speed drops, go to step 3). If engine speed does not drop or increases, repair carburetor for a plugged circuit.
  3. Connect tachometer to engine. Disconnect vacuum hose from EGR valve. Connect auxiliary vacuum supply to EGR valve. If equipped, disconnect and plug vacuum hose at solenoid kicker. Start engine, momentarily raise engine speed above 1100 RPM and then wait 2 minutes for idle speed to stabilize. Very slowly apply vacuum to EGR valve.
  4. Engine speed should begin to drop when applied vacuum reaches 2 to 5 in. Hg of vacuum and continue to drop as more vacuum is applied. Engine may stall before 5 in. Hg of vacuum is applied. If engine speed drop is okay, go to step 5). If engine speed does not drop or engine speed does not drop until 5 in. Hg or more vacuum, replace EGR valve.
  5. Connect tachometer to engine. Where applicable, vacuum hose at solenoid kicker plugged. Engine running at idle for than 2 minutes. Disconnect EGR hose. Connect vacuum gauge to EGR vacuum hose. Slowly increase engine speed.
  6. As engine speed increases so should the reading on vacuum gauge. If vacuum reading is okay, go to TEST 14  . If vacuum is not okay, go to step 7).
  7. Turn engine off. Remove connector from EGR CVSCC valve. Connect vacuum pump to either port of valve. Try to apply vacuum. Vacuum should not hold with engine coolant above 125°F (52°C). If vacuum does not hold, check EGR signal hose from carburetor, for leaks or restrictions. If vacuum holds, replace EGR CVSCC valve.
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