Cam Positing Censor Going Bad?
Thread Starter
|
Postmaster
Joined: Aug 2005
Posts: 2,992
Likes: 2
From: Lancaster, MA
Cam Positing Censor Going Bad?
OK, I've been reading a lot of posts about the CPS and trying to piece this all together and sum it up in my small brain. My truck does not die or sputter at all. What does happen is my tach bounces around a bit and my truck gets very doggy from 40 to 50 MPH. I thought it was the big tires with the stock 3.73s, but it does the same thing with the stock tires as well. My buddy swears both these problems are from the CPS. Is he right?
Laughing Gas
Joined: May 2007
Posts: 1,100
Likes: 0
From: Davis, Ca.
Is it only between 40 and 50mph? I have has three cps go bad. All have had different symptoms. One died when at low rpm's with a load. One died at freeway speeds then restarted on it's own about three seconds later. The other died at freeway speeds until I stopped put it in park and restarted. Then it died again within a mile. Only being doggish at 40 to 50 sounds like it would be something else to me.
Thread Starter
|
Postmaster
Joined: Aug 2005
Posts: 2,992
Likes: 2
From: Lancaster, MA
Yes its only between 40 and 50 mph. The more I think about it, its strange because it did it at 40-50 with my stock tires and my 37s and I didn't recalibrate the speedometer so it was reading the 37s even with the stockers on.
Thread Starter
|
Postmaster
Joined: Aug 2005
Posts: 2,992
Likes: 2
From: Lancaster, MA
Right, but why would it do the same thing at 40-50 MPH on my speedo even though I know that its reading the wrong speed. The speedo is correct with the 37s, so we know the reading is off with the stockers. Why would it still act up at the same speed on the speedo, when the tires are turning at a different speed? I might be dumb and missing something here...
Hotshot
Joined: May 2005
Posts: 13,484
Likes: 42
From: Stevens Point, WI
Because your actual speed changes with the different tires doesn't mean your drivetrain speed changes.
So say at 65 mph with your bigger tires you have dialed in that you are actually doing 65mph and we will say your drivetrain is turning at 1500rpm.
With the smaller tires doing 65mph on the speedo you will actually be going 61mph down the road but your drivetrain will still be turning at 1500rpm same as before. Only thing changing is your actual speed going down the road not the drivetrain speed.
Hope that helps a little better.
So say at 65 mph with your bigger tires you have dialed in that you are actually doing 65mph and we will say your drivetrain is turning at 1500rpm.
With the smaller tires doing 65mph on the speedo you will actually be going 61mph down the road but your drivetrain will still be turning at 1500rpm same as before. Only thing changing is your actual speed going down the road not the drivetrain speed.
Hope that helps a little better.
Trending Topics
Thread Starter
|
Postmaster
Joined: Aug 2005
Posts: 2,992
Likes: 2
From: Lancaster, MA
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
