Mixture Solenoid - Poor Driveability/MIL ON/Code 44 Set

86chevy02

Number: 82-161

Section: 6C

Date: Apr., 1986

Subject: POOR DRIVEABILITY OR CHECK ENGINE LIGHT CODE 44 (LEAN) OR CODE 45 (RICH)


Model and Year: 1982 CAVALIER WITH 1.8L (L46) VIN CODE G ENGINE


TO: ALL CHEVROLET DEALERS


This cancels and replaces Bulletin 82-160 dated February, 1986, which should be destroyed. The new Bulletin identifies the correct part number to order when replacing solenoid fuel valve tips.

If the owner complains of poor driveability or check engine light Code 44 (LEAN) or Code 45 (RICH) the problem may be due to a failed mixture control solenoid fuel valve tip.

Some O.E.M. solenoids have rubber fuel valve tips and some have stainless steel fuel valve tips. The replacement kit for both rubber and stainless steel is #17111445 stainless steel.

Rubber valve tips can fragment causing a lean or rich condition with the following symptoms:

LEAN RICH

^ Loss ot part throttle power. ^ Sulfurous odor.
^ Stumble or hesitation on part- ^ Stall at idle. throttle acceleration.
^ Occasional backfire on acceleration. ^ Black smoke in some cases.
^ Surge. ^ "CHECK ENGINE" light w/Code 45 stored in ECM.
^ "CHECK ENGINE" light w/Code 44 stored in ECM.
If an owner experiences any of these symptoms, the mixture control (M/C) solenoid fuel valve tip should be checked for proper sealing, following the Solenoid Fuel Valve Tip and Metering Orifice Check. If it does not pass all the checks, replace it.
1. Remove M/C solenoid from carburetor.
2. Inspect the solenoid to float bowl seal. If cracked or damaged, remove retainer, seal, and spacer, for this check.
3. Energize M/C solenoid using a 12 volt source, (solenoid will be in the lean position).
^ Connect a jumper between the RIGHT terminal of the solenoid connector and the positive (+) terminal of the 12 volt source.
^ Connect the LEFT terminal of the solenoid connector and the ground (-) terminal.

Hand Operated Vacuum Pump:

4. Use J-23738-A or BT-7517, hand operated type vacuum pump, to apply approximately 5" Hg (16kPa) vacuum to the seal end of the solenoid. Do not exceed 5" Hg (16kPa) vacuum as the fuel valve tip could become stuck in the metering orifice.
^ If it does not hold some vacuum for approximately five seconds, the fuel valve tip is not sealing properly, and the solenoid should be replaced.
5. Remove the jumper lead to the 12 volt source. The gage reading should go to zero. If it does not, the fuel valve tip is sticking or the fuel metering orifice is blocked, and the solenoid should be replaced.
6. Apply rapid vacuum pumping action. Gage should move only slightly, then return to zero before the next, rapid stroke. If it does not, the fuel metering orifice is restricted, and the solenoid should be replaced.
7. Reposition or replace solenoid seal if necessary.
8. Install M/C solenoid in carburetor with a new gasket.

THIS SERVICE IS COVERED BY THE EMISSION WARRANTY PROVISIONS OF 5 YRS/50,000 MILES.