Engine surging

WILLIAM55

MEMBER
1999 CHEVROLET 3500
6.5L
V8
TURBO
2WD
MANUAL
180,000 MILES

Started with heavy black smoke and stalling. Replaced Pmd, injection pump, filter, screen and waste-gate relay.
Black smoke now occurs when accelerating, but now experiencing RPM surging at highway after it warms up. No longer stalls.
Different scanners show different codes. One shows codes for the fuel pump or fuel injection pump. The other shows a code for glow plugs.
What could it be?

1 Reply

SEVAG P

MECHANIC
405 POSTS

Hello,

Glow plugs function is at cold start only it is used to warm the combustion chamber.
I think your problem is from injection pump, injector or injection pump timing.
Please send fault codes for proper diagnosis.
Thank you.