Problem 17 - Engine Starts Hard And Runs; Rough / Lacks Power / Backfires - Generac Power Systems 7 kW NG Repair Manual

Section 4.4
Troubleshooting Flowcharts
Problem 17 – Engine Starts Hard and Runs Rough / Lacks Power / Backfires
TEST 50 – CHECK
FUEL SUPPLY AND
PRESSURE
BAD
FIND AND CORRECT
CAUSE OF NO FUEL
OR LOW PRESSURE
BAD
TEST 60 – CHECK
IGNITION MAGNETOS
BAD
ADJUST OR
REPLACE
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IF RECONFIGURED TO LP GAS,
VERIFY THAT PROPER
GOOD
PROCEDURE WAS FOLLOWED.
(REFER TO SECTION 1.3)
TEST 55 –
GOOD
CHECK FOR
IGNITION SPARK
CHECK
FLYWHEEL
KEY
GOOD
CONTACT TECHNICAL
SUPPORT
GOOD
TEST 53 – CHECK
CHOKE SOLENOID
BAD
REPLACE CHOKE SOLENOID
TEST 57 –
CHECK SPARK
PLUGS
BAD
CLEAN, REGAP
OR REPLACE
TEST 58 – CHECK
ENGINE
GOOD
COMPRESSION
BAD
REFER TO ENGINE
SERVICE MANUAL
PART 4
ENGINE/DC CONTROL
CHECK AIR FILTER -
REPLACE AS NEEDED
READJUST
BAD
TEST 63 –
CHECK AND
GOOD
ADJUST VALVES
GOOD
TEST 12 – CHECK
STEPPER MOTOR
GOOD
CONTROL
BAD
REPAIR OR
REPLACE