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Why does your 1990 buick park ave run fine while driving but cuts off as soon as you press the brakes even after replacing fuel pump fuel filter and spark plugs?
Wiki User
∙ 18y ago
1. Disconnect brake light switch (under dash, at brake pedal arm) -- this will eliminate "miss-wirings". 2. Pull Fuse #7 at fuse block -- this will disable the A/C Compressor motor. If problem solved, test/replace: a. A/C Select Relay in Relay Control Panel (behind glove box) b. A/C Hi-Pressure Cutout Switch, c. A/C Cycling switch, Replace Fuse #7. (These switches control the Compressor Clutch which should be de-energized during Wide-Open-Throttle, Engine-not-running, Power Steering load is excessive, coolant temperature exceeds 237 degrees F, OR A/C not requested.) 3. Pull Fuse #5 at the fuse block and remove the A/C Cutout Relay (engine compartment, at firewall). This will keep the A/C Compressor Clutch from engaging. Replace Fuse #5. 4. Dump your engine codes. Key Off Jumper two "left-most on the "forward row" of pins on ODB-1 connector block (just above main heater outlet at transmission hump) -- toward the left front tire. Key to RUN (not START). Count the codes at the 'Service Engine Light'. Code '12' is OK -- just acknowledging communications with the ECM. Record any other codes. 5. Dump Diagnostic codes. Engine OFF. Jumper out. Key OFF. Key ON (not START). Insert jumper at "left-most on the "forward row". Read and record codes.
Wiki User
∙ 18y ago
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