If you have Chevrolet Car you must download Manual Chevrolet Technical Service Bulletin Guide for you will found detail information about this car. Free service bulletin for user, owners, and buyers guide. Get best performance for this chevrolet by maintenace schedule periodic and service/repair manual with do it by your self.
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……content summary………Models: 1999 Chevrolet and GMC Medium Duty Trucks w/ IMPCO LPG Fuel System Condition Some drivers and/or technicians may notice a severe surge at idle. The idle speed of the engine will fluctuate between approximately 300 and 1200 rpm. Normal idle speed is approximately 650 to 750 rpm. On certain vehicles, the idle surge will be intermittent. This condition will be more noticeable first thing in the morning after a cold start. Certain vehicles may also experience stalls, hesitation and overall poor driveability. Cause The Fuel Control Solenoid (FCS) sticks intermittently. Correction Cleaning the Fuel Control Solenoid (FCS) with carburetor / throttle body cleaner (non- chlorinated / O2 sensor safe) should fix the condition. Important Preliminary Checks: – Verify all engine electrical connections are secure. – Verify the PCV vacuum plug behind throttle body is in place. – Verify the hose connection between the throttle body to AF fuel metering module (elbow) is secure. Repair any of the above conditions as necessary. If no trouble is found, clean the FCS using the following procedure. 1. Loosen the clamp and disconnect the ¼” vacuum hose from the 90° fitting on top of the regulator directly above the stainless steel fuel outlet fitting. 2. Start the engine. CAUTION: Carburetor / throttle body cleaner is highly flammable. 3. Shoot about a two-second burst of carburetor / throttle body cleaner ( non- chlorinated / O2 sensor safe ) into the vacuum hose. 4. Allow the engine to idle for about ten seconds. Important: Operating the engine for more than 30 seconds with the vacuum hose disconnected may set a DTC and illuminate the CHECK ENGINE light. 5. Stop the engine and re-connect the vacuum hose. 6. If CHECK ENGINE light is illuminated, clear any DTCs. Perform steps 4 thru 6 of the AF Powertrain OBD System Check in the 99 MD LPG Service Manual…..download for more information……..
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