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Truck at startup idles between 2,200 and 2,400 RPMs

Tiny
EWC177
  • MEMBER
  • 1995 FORD RANGER
  • 4.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Tried to reset new IAC and PCM. Didn't work. Checked screw under throttle, it's nearly all the way in. Changed MAF, TPS, fuel sensor, all o2 sensors, catalytic converter, manifold, all vacuum lines, and replaced fuel pump, pressure regulator, fuses, and other things such as coil, plugs, and wires. Starting to run out of patience and money. Any help will be appreciated.
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Sunday, April 11th, 2021 AT 5:14 PM

23 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The base idle screw being all the way in has raised the idle very high. With the IAC motor disconnected, the idle should be 500 RPMs.

https://www.2carpros.com/articles/engine-idles-too-high

I would clean the throttle body of all carbon deposits to be sure the plate is closing all the way.

https://www.2carpros.com/articles/throttle-actuator-service

Roy
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Monday, April 12th, 2021 AT 4:32 AM
Tiny
EWC177
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  • 144 POSTS
Throttle has been completely removed and cleaned with throttle cleaner, and the plate screw was originally all the way in, and it was worse.
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Monday, April 12th, 2021 AT 6:04 AM
Tiny
ASEMASTER6371
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Again, if it is all the way in, it will raise the idle. It should not be all the way in, it should only crack open the plate a small amount.

Roy
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Monday, April 12th, 2021 AT 12:41 PM
Tiny
EWC177
  • MEMBER
  • 144 POSTS
It's only in about a thread or 2, and it's still idling around 2,300 RPMs.
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Monday, April 12th, 2021 AT 2:31 PM
Tiny
ASEMASTER6371
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  • 52,797 POSTS
Can you attach some pictures and a video?

Roy
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Monday, April 12th, 2021 AT 2:38 PM
Tiny
EWC177
  • MEMBER
  • 144 POSTS
I'll try to upload some tomorrow after work, didn't check my emails before it got dark here.
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Monday, April 12th, 2021 AT 6:07 PM
Tiny
ASEMASTER6371
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Sounds like a plan.

Roy
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Monday, April 12th, 2021 AT 6:10 PM
Tiny
EWC177
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Thanks.
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Monday, April 12th, 2021 AT 6:11 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Also. Unplug the idle air control and see if the idles comes down.

Roy
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Monday, April 12th, 2021 AT 11:03 PM
Tiny
EWC177
  • MEMBER
  • 144 POSTS
Tried that, and it didn't.
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Tuesday, April 13th, 2021 AT 3:47 AM
Tiny
ASEMASTER6371
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Look for any vacuum leaks especially at the brake booster. If it is good, then I suspect the throttle body itself.

Roy
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Tuesday, April 13th, 2021 AT 4:00 AM
Tiny
EWC177
  • MEMBER
  • 144 POSTS
RPM checked with odb 2.
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Tuesday, April 13th, 2021 AT 5:48 PM
Tiny
EWC177
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  • 144 POSTS
2nd video.
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Tuesday, April 13th, 2021 AT 5:51 PM
Tiny
EWC177
  • MEMBER
  • 144 POSTS
After reconnecting IAC and TPS.
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Tuesday, April 13th, 2021 AT 5:53 PM
Tiny
EWC177
  • MEMBER
  • 144 POSTS
Vacuum leak.
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Tuesday, April 13th, 2021 AT 5:55 PM
Tiny
ASEMASTER6371
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This sounds like you need a lower intake manifold gasket from where you are spraying.

The valve you circled is the DPFE and that will not cause the leak.

https://www.2carpros.com/articles/replace-intake-manifold-gasket

I attached the procedure for you to view.

Roy
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Wednesday, April 14th, 2021 AT 12:32 AM
Tiny
EWC177
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  • 144 POSTS
Just had the manifold replaced, and new gaskets, twice. Took to one less than reputable shop and paid over $300.00. Then still had problems and went to another shop that works on everything and had to but new intake and gasket set because the others had left out the rounded bushing type gaskets.
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Wednesday, April 14th, 2021 AT 2:47 AM
Tiny
ASEMASTER6371
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From your video, it points right to it.

Did they give it back to you that way after the repair?

Roy
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Wednesday, April 14th, 2021 AT 3:58 AM
Tiny
EWC177
  • MEMBER
  • 144 POSTS
Yes, it was running better, but would lag down if you dropped below 50 MPH.
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Wednesday, April 14th, 2021 AT 4:13 AM
Tiny
EWC177
  • MEMBER
  • 144 POSTS
Kind of a light lunge.
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Wednesday, April 14th, 2021 AT 4:13 AM

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