Engine surging

1999 CHEVROLET 3500
180,000 MILES • 6.5L • V8 • TURBO • 2WD • MANUAL
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WILLIAM55
  • MEMBER
  • 1 POST
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?
Feb 2, 2019 at 12:03 PM
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SEVAG P
  • ✓Experienced 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.
Feb 2, 2019 at 10:04 PM
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