Will not idle in drive

Tiny
MATTHEW RICHARDSON
  • MEMBER
  • 2000 LINCOLN CONTINENTAL
  • 4.7L
  • V8
  • 146,000 MILES
Wants to shut off setting at a light or pulling through a turn letting off the gas. Runs in idle in neutral. Not drive.
Saturday, March 7th, 2020 AT 10:58 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

A few different things that can cause an idle issue. First, an engine vacuum leak can be the cause. Here is a link that explains how to check for one:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Next, the vehicle has what is called an idle air control valve (IAC). The IAC is responsible for maintaining engine idle speed. Here are two links. The first explains how to service one and the second shows in general how one is replaced.

https://www.2carpros.com/articles/idle-air-control-valve-service

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

Here is a link that explains the most common causes of stalling at idle. Take a look through it and let me know if it helps.

https://www.2carpros.com/articles/stall-at-idle

If the check engine light is staying on with the engine running, have the computer scanned. Most parts stores will do it free of charge. It that is the case and it's on, have it checked and let me know the results.

Take care and let me know if you have other questions.

Joe
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Saturday, March 7th, 2020 AT 11:32 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
What you are describing is a common symptom of a dirty or malfunctioning Idle Air Control (IAC).

I snapped a few pictures when it occurred on my wife's 2003 Ford Escape.

Our Escape would idle low, then it got to point it would die when you stopped. Revving + holding brake was only way to keep it running.

The IAC is kind of on top of the throttle body and has 2 bolts.

We removed and cleaned it using throttle body cleaner (spray can), carefully actuate the plunger when you clean it. It may have gone on being fine, for a lot longer with just the cleaning.

Since it was my wife's, I took no chances, with my Well-Being. Yes, I visited parts store and replaced it, I figured it had 100,000 miles on it, and constantly was a moving part, replacement of this component, was just preventative maintenance in my eyes.

A new one for yours starts at about $47.00 at Advance Auto Parts.

This part is very easy to spot on your engine, my Escapes looks almost identical to yours.

Below are pictures of mine. keep in mind the part numbers in my pictures belong to my six cylinder Escape.

I also posted you two items from "Repair Guides" (top left on our pages).

https://www.2carpros.com/articles/idle-air-control-valve-service

Here's the other:

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

Keep us informed.

The Medic
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Sunday, March 8th, 2020 AT 12:01 AM

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