Deceleration System: Testing
- Connect tachometer to engine and raise speed to 3000 RPM several times. Engine speed should delay for several seconds at 1500 RPM, then return to idle at 900-950 RPM.
- If engine speed remains high for more than 2-3 seconds or does not return to idle, disconnect vacuum line from vacuum unit. If RPM is still high, check for binding linkage from vacuum unit or accelerator pedal. Adjust vacuum unit or carburetor if necessary.
- If engine speed returns to idle with hose off, check vacuum hose routing and adjust deceleration valve. If problem is not corrected, replace valve.
- If engine does not delay before returning to idle, check vacuum routing and condition of hoses. Disconnect vacuum hose (green stripe) from vacuum tee and connect to deceleration vacuum unit. If linkage does not move, replace vacuum unit. If linkage moves, adjust deceleration valve. If adjustment does not correct problem, replace valve.
Courtesy of PEUGEOT MOTORS OF AMERICA, INC.