Hesitation, Poor Idle: ECU Failure with Codes 2-3-1 2-3-2 Symptoms Related to Engine Sensors or ECU:Įngine Failure/No Start/Severe Stumbling: Bad ECUĮngine Lacks Power When Hot: Bad Regina/Rex ECU Stumble, Stall, Poor MPG: Bad Engine Ground Connection Hot/Cold Air Box Thermostat and AMM Failure Hesitation Poor Driveability: Bad Air Mass Meter Symptomsīackfire, Poor Acceleration: Failing Radio Suppression Relay Slight Hesitation on Acceleration Several Diagnostic Checks Intermittent Stalling: Faulty IAC or Hall Sensor Low Idle or Stall in Regina-Equipped Car: Coil Pack Runs Rich Black Smoke Poor Acceleration: ECT, TPS, FI. Mixture, Misfire or Idle Control Problems: No Start, Poor Fuel Economy: Timing Problems Intermittent No Start/Stall: Battery Cable Connector Failureįrequent Stall or Hesitation: Carburetted Engines Intermittent No Start: Water Leaking Onto Distributor Intermittent No Start: Fuse Contact Failure Intermittent No Start or No Warm Restart: Radio Suppression, FI Relay, RPM Sensor No or Poor Cold Start: Problem Diagnosis and Repair No or Slow Hot Start: Problem Diagnosis and Repair Guide No Start Frequent Stall or Hesitation: Basic Diagnostics Poor idle, Smoke, Oil Leaks: Clogged Flame TrapĮngine Dies After Starting, Won't Idle Needs Intake Cleaning Poor Idle, Idle Surge and Hunt: Cleaning Your Throttle Body General Symptoms and B2XX Series Engines:ĭon't Panic: Diagnose First Before Concluding the Worst! Some notes relate to carburetted cars: they are identified as such. Diesel symptoms are covered in the diesel file. Symptoms for B6304 engines used in the Volvo 960/90 series cars with Bosch Motronic are covered in a separate 960 file. Where known, these are noted in the relevent section. Regina-equipped cars have some differences in components and component failure patterns. Most of these notes apply to Bosch LH 2.2 and LH2.4-equipped cars. Note: Symptoms may involve several potential failures, so diagnosis should start with a general perusal of this entire section. VOC Home | FAQ Home Engine Tune and PerformanceĮngine Tune and Performance: Symptoms PDF
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