Strange revving engine

GMC guy

Hero Member
Joined
Feb 16, 2008
Messages
317
Likes
0
Points
16
#1
Please fill out the following to ask a question.

MAKE: GMC
MODEL: c5500
YEAR: 2005
MILES: 230k
ENGINE
: 6.6 duramax diesel
DESCRIBE ISSUE....intermittent problem. I'm driving along and when the tranny kicks into 2nd gear, the engine revs like I am pumping the gas. Problem eventually goes away. I wonder if changing the fuel filter would correct this.
 

EricC

Hero Member
Joined
Nov 14, 2006
Messages
423
Likes
3
Points
18
Location
Tulsa, OK
Website
facebook.com
#2
If your fuel filter has >10k miles on it, it's time to change it regardless. Have you scanned it for codes, whether the Check Engine light is on or not? Any other warning lights? Any recent repairs or issues?
 

billr

wrench
Staff member
Joined
Mar 12, 2007
Messages
5,950
Likes
59
Points
48
#3
If the engine rpm "flares" briefly right after a shift, a clutch is slipping more than normal. It can't hurt to change the fuel filter, but that ain't it. Agreed, a thorough scan for codes should be the first step. I assume the trans fluid level is OK and doesn't look/smell like crap, correct???