Lack of Power/Sluggish/Spongy/Stumble

Engine delivers less than expected power. Little or no increase in speed on slight acceleration.

POSSIBLE CAUSE ACTION

EGR malfunction Check EGR system in "Testing
Procedures" in Emissions



Spark timing - excessive retard Check Spark Controls in
"Computerized Engine Controls"



Defective PTC heater Check PTC heater system
in "Testing Procedures" in Emissions



Initial timing incorrect Check Ignition Timing in "Adjustment
Procedures" in Emissions



Restricted exhaust Check Catalytic Converter in
"Testing Procedures" in Emissions



Poor or contaminated fuel Recommend higher grade fuel