dieseling under lad

1999 CHEVROLET
200,000 MILES
Avatar
HONDAGUY
  • MEMBER
  • 1 POST
Changed plugs,wires,cap,rotor.fuel pressure is 55pds.the engine still does this dieseling under load.
Aug 30, 2011 at 3:29 AM
Advertisement
Avatar
DAVE'S BIG BACKYARD!
  • EXPERT
  • 262 POSTS
try up grading your fuel it might help.one more thing hook a scaner to it and make sure it dont have any egr codes
Aug 30, 2011 at 7:13 PM
Avatar
JDL
  • CERTIFIED EXPERT
  • 16,098 POSTS
What is model of vehicle, litre size of engine? If you have preignition, can be caused by a hot spot. I thought dieseling was with the key off? Check compression.
Aug 30, 2011 at 7:57 PM
Advertisement
Avatar
DAVE'S BIG BACKYARD!
  • EXPERT
  • 262 POSTS
most newer cars have spark knock under control,unless it has a vac leak or a fuel, or egr flow issue.
Aug 30, 2011 at 8:41 PM