Odd RPM Behavior
Thread Starter
|
Beginning Member
Joined: Jan 2012
Posts: 24
Odd RPM Behavior
'98 GMC Jimmy 4 Door, 4x4
When driving with the engine under a sustained load (e.g. driving uphill at around 2,400 RPM 55-60mph) I will lose and gain ~ 50 RPM every few seconds, alternating. I've had it happen with as little as 5 seconds between change, to 15+ seconds between change. Happens pretty consistently.
Up, down, up, down, up, down, etc. Noticeable change in engine pitch, and I can feel the loss/gain in the truck itself. This doesn't happen when I'm just cruising down the highway.
When driving with the engine under a sustained load (e.g. driving uphill at around 2,400 RPM 55-60mph) I will lose and gain ~ 50 RPM every few seconds, alternating. I've had it happen with as little as 5 seconds between change, to 15+ seconds between change. Happens pretty consistently.
Up, down, up, down, up, down, etc. Noticeable change in engine pitch, and I can feel the loss/gain in the truck itself. This doesn't happen when I'm just cruising down the highway.
Thread
Thread Starter
Forum
Replies
Last Post
wrxin
Engine & Transmission
16
Feb 12, 2014 04:36 PM
Mr Mackey
Engine & Transmission
2
Jun 28, 2013 07:13 PM
BB3439
2nd Generation S-series (1995-2005) Tech
5
Jun 28, 2011 05:48 PM