Slight RPM bounce

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Nov 23, 2009 | 06:56 PM

CruiserClass

Thread Starter

Tuned

Joined: Feb 2007

Posts: 490

Likes: 3

Slight RPM bounce

My truck is starting to "bounce" a bit during light acceleration and at certain speeds. Holding a steady 40 or so on flat ground and 45 on an incline. The truck maintains speed fine and I don't think its actually shifting, but maybe the TC is locking/unlocking? The RPMS fluctuate slightly, but noticably both by feel and by the tach.

It never does it under hard acceleration or at very low speeds or highway speeds.

Nov 24, 2009 | 05:37 PM

CruiserClass

Thread Starter

Tuned

Joined: Feb 2007

Posts: 490

Likes: 3

Bueller? Bueller?

Nov 24, 2009 | 09:19 PM

MX_Fyrcaptain

Senior User

Joined: Feb 2009

Posts: 405

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From: Vacaville, Ca.

No idea, but here's a bump.

Nov 25, 2009 | 04:01 PM

BigJake34452

Senior User

Joined: Nov 2007

Posts: 305

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From: Inverness Fl

heres a bump for ya, i dont think this is a TC issue because i have almost the same exact problem but i got a 6 speed..

Nov 27, 2009 | 10:30 PM

CruiserClass

Thread Starter

Tuned

Joined: Feb 2007

Posts: 490

Likes: 3

OK, last bump. If no one has any ideas I'll just figure I've stumped even the mighty collective knowledge of FTE.

Nov 27, 2009 | 10:43 PM

Layson

Posting Guru

Joined: Jan 2007

Posts: 2,174

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From: Millersburg, OR

Could be an IPR issue... can you watch your ICP? You would see the psi spiking up and down... Do you have AE?

Nov 28, 2009 | 08:00 AM

CruiserClass

Thread Starter

Tuned

Joined: Feb 2007

Posts: 490

Likes: 3

OK, after some searching I figured out what ICP and AE is. Its a late 99. I'm not sure how to check the injector code, nor do I have a way to monitor fuel pressure.