Coincidence & Am I on the Right Path
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Joined: Jun 2024
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From: Albuquerque, NM
Coincidence & Am I on the Right Path
Hi,
Was my issue today at one of those quick lube places just a pure coincidence, and am I on the right path to correcting the issue? The truck has a very high idle upon starting and when shifting. There is no tachometer so I can’t state definitely the specific RPMs but I am guessing then to be about 3,000 RPM.
1999 Ford Ranger 2WD extra cab (suicide doors), 4.0, 5-speed manual, 227,000 miles
I just moved to a northern state from a southern state 2 days ago. I took the truck to one of those quick lube places since all my tools are packed away. Oil change, rear diff change/fill, radiator flush, & fuel injector service. Upon starting the truck after the oil change it revved very high. The staff immediately shut it off and restarted it. It did the same high idle again. And again. And again. The staff then asked me if it had done that before, which I answered no, it was the first time. They came back in a few minutes suggesting it was the IAC. I agreed since I had not yet researched it so an IAC was delivered by O’Reillys, installed, and….. no change.
:(
I disconnected the TPS and now I have a check engine light on . But, disconnecting the TPS seemed to fix it. That leads me to believe I need to change the TPS.
Was this a coincidence?
Could the staff have accidentally caused this issue?
Would reconnecting the TPS, and then disconnecting the IAC to see if the vehicle stalls prove there is no vacuum leak?
Since disconnecting the TPS appears to resolve the issue, should I just replace it, call it good, and move on?
TIA
Was my issue today at one of those quick lube places just a pure coincidence, and am I on the right path to correcting the issue? The truck has a very high idle upon starting and when shifting. There is no tachometer so I can’t state definitely the specific RPMs but I am guessing then to be about 3,000 RPM.
1999 Ford Ranger 2WD extra cab (suicide doors), 4.0, 5-speed manual, 227,000 miles
I just moved to a northern state from a southern state 2 days ago. I took the truck to one of those quick lube places since all my tools are packed away. Oil change, rear diff change/fill, radiator flush, & fuel injector service. Upon starting the truck after the oil change it revved very high. The staff immediately shut it off and restarted it. It did the same high idle again. And again. And again. The staff then asked me if it had done that before, which I answered no, it was the first time. They came back in a few minutes suggesting it was the IAC. I agreed since I had not yet researched it so an IAC was delivered by O’Reillys, installed, and….. no change.
:(
I disconnected the TPS and now I have a check engine light on . But, disconnecting the TPS seemed to fix it. That leads me to believe I need to change the TPS.
Was this a coincidence?
Could the staff have accidentally caused this issue?
Would reconnecting the TPS, and then disconnecting the IAC to see if the vehicle stalls prove there is no vacuum leak?
Since disconnecting the TPS appears to resolve the issue, should I just replace it, call it good, and move on?
TIA
Member
Joined: Sep 2019
Posts: 1,193
Likes: 182
From: Hackensack, Nj
What's the code associated with your CEL being on? Read it or have it read.
Try the disconnection of the IAC after reconnecting the TPS, as you suggested, and see what happens.
Presence of a huge vacuum leak will keep the engine running high, if I understand you.
Check the PCV routing as it's a potential vacuum leak. A hard plastic line as old as yours can split.
Don't just fire the parts cannon at it. There are voltage checks for the TPS. It's a 5 volt system
If you do end up replacing it, go for Motorcraft only.
Try the disconnection of the IAC after reconnecting the TPS, as you suggested, and see what happens.
Presence of a huge vacuum leak will keep the engine running high, if I understand you.
Check the PCV routing as it's a potential vacuum leak. A hard plastic line as old as yours can split.
Don't just fire the parts cannon at it. There are voltage checks for the TPS. It's a 5 volt system
If you do end up replacing it, go for Motorcraft only.
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