Dieseling under lad

Tiny
HONDAGUY
  • 1999 CHEVROLET
  • 200,000 MILES

Changed plugs, wires, cap, rotor. Fuel pressure is 55pds. The engine still does this dieseling under load.

Do you
have the same problem?
Yes
No
Tuesday, August 30th, 2011 AT 3:29 AM

3 Replies

Tiny
DAVE'S BIG BACKYARD!
  • EXPERT
  • 264 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

Was this
answer
helpful?
Yes
No
Tuesday, August 30th, 2011 AT 7:13 PM
Tiny
JDL
  • EXPERT
  • 16,281 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.

Was this
answer
helpful?
Yes
No
Tuesday, August 30th, 2011 AT 7:57 PM
Tiny
DAVE'S BIG BACKYARD!
  • EXPERT
  • 264 POSTS

Most newer cars have spark knock under control, unless it has a vac leak or a fuel, or egr flow issue.

Was this
answer
helpful?
Yes
No
Tuesday, August 30th, 2011 AT 8:41 PM

Please login or register to post a reply.

Other Fuel System Pump Pressure Questions