RPM Variation
Thread Starter
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Junior User
Joined: Jun 2009
Posts: 71
Likes: 0
From: Billerica, MA
RPM Variation
Ok guys Im new here, this is my first thread and Im hoping for some good help. When cruising down the highway at speeds between 50mph-70mph my rpm's will randomly jump up 200rpm-300rpm. If anyone knows what could cause this or has experienced a similar problem please fill me in. Now mind you it will not do this at any other speed.
Post Fiend
Joined: Mar 2007
Posts: 9,010
Likes: 5
From: Johnson City, TN.
There is a sensor. I think it is in the top of the rear axle. If you can pull it out and clean it off that may help.
Tell us more about your truck.
Year
tranny type
any mods
how long has it been doing this
etc.
Basically anything else you can give us will help quite a bit.
Tell us more about your truck.
Year
tranny type
any mods
how long has it been doing this
etc.
Basically anything else you can give us will help quite a bit.
Thread Starter
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Junior User
Joined: Jun 2009
Posts: 71
Likes: 0
From: Billerica, MA
More info for ya's
I replaced the sensor in the rear end about 2 weeks ago and it still does it. Cruise control will not work for any more than 1 min before it deactivates. I did not do the tranny my self but it was done in february 09 w/ new TC I understand it could still be a posibility though.
its a 97 powerstroke
Auto e40d
k&n intake
3in down pipe to 4in straight pipe
4in skyjacker lift w/35in procomps
its a 97 powerstroke
Auto e40d
k&n intake
3in down pipe to 4in straight pipe
4in skyjacker lift w/35in procomps
Postmaster
Joined: Nov 2005
Posts: 3,168
Likes: 10
From: San Ramon Ca.
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Thread Starter
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Junior User
Joined: Jun 2009
Posts: 71
Likes: 0
From: Billerica, MA
Thanks i will look into the bulbs and fuse to figure out the cruise problem. If any one has any more ideas about the RPM Variation though that would be great cause it occurs when cruise control is off also. I am gunna bring it back to the tranny shop and have a word with them about the TC cause it was supposedly replaced with the tranny but we all know how hard it can be to find a honest person now a day. I knew I should have just done the job myself but work and shcool kills all my spare time.
97 F-350 7.3
Auto
K&N Intake
3in Down pipe to 4in straight pipe
4in skyjacker lift w/ 35in Procomp Xtreme A/T
97 F-350 7.3
Auto
K&N Intake
3in Down pipe to 4in straight pipe
4in skyjacker lift w/ 35in Procomp Xtreme A/T
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Postmaster
Joined: Feb 2004
Posts: 3,266
Likes: 0
From: Levittown
The led's are your problem.
Cheap led's donot mimic the oem lamp load.
Remove them or install load resistors.
Bill
Thread Starter
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Junior User
Joined: Jun 2009
Posts: 71
Likes: 0
From: Billerica, MA
Well i changed the bulbs back to OEM then went and ran it up and down the highway between 50 and 70 and my rpm never varied, also my cruise control worked perfectly fine. i really appreciate all the help and im sure ill be back for more. THANKS a lot guys.
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
