CHIRPING NOISE AT IDLE AIR CHECK VALVE INFORMATION

A "CHIRPING" NOISE COMING FROM THE ENGINE COMPARTMENT AT IDLE MAY BE FROM THE A.I.R. CHECK VALVE IN THE AIR SUPPLY LINE TO THE CATALYTIC CONVERTER (SEE FIGURE 1). THIS NOISE MAY BE EVIDENT WHEN THE VEHICLE IS FULLY WARMED UP. TO DETERMINE IF THIS NOISE IS ORIGINATING FROM THE CHECK VALVE, PINCH OFF THE RUBBER HOSE BETWEEN THE CHECK VALVE AND THE AIR MANAGMENT VALVE. IF THE NOISE STOPS, THE CHECK VALVE SHOULD BE REPLACED. THE ORIGINAL CHECK VALVE (P/N 22017478) SHOULD BE REPLACED WITH CHECK VALVE, P/N 22036195. THE CHART BELOW LISTS THE VEHICLES AND ENGINES. V.I.N. ENGINE CODE VEHICLE APPLICATION ENGINE 1981-82 1983 CAMARO MALIBU/MONTE CARLO CAPRICE 3.8L V6 - LC3 K 9 1981 1981-83 1981-83 5.0L V8 - LG4 H H 1981 1981-83 1981-83 5.7L V8 - LM1 L 6 1981 1981 1981-83 5.0L V8 - L69 - 7 ---- 1983 (MONTE CARLO) -------

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