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Intake air temp sensor is bad?

Tiny
WORTHIN52
  • MEMBER
  • 1997 FORD RANGER
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
How can you tell when an intake air temp sensor is bad?
Saturday, November 8th, 2014 AT 5:04 PM

13 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
The check engine light should come on. What is happening?
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Saturday, November 8th, 2014 AT 7:11 PM
Tiny
WORTHIN52
  • MEMBER
  • 35 POSTS
The truck runs fine until the outside temperature gets below 60. Then the check engine light comes on and it will surge at idle in gear or in park. If you wait a minute or so it will stop surging. I also get error codes for my O2 sensors. I don’t understand that because I replaced them a couple of months ago. This really has me stumped.
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Saturday, November 8th, 2014 AT 9:25 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
I need to know all the codes you are getting. The idle air control valve (IAC) could be bad, a vacuum leak. Both of which can set an o2 code. Let me know what you found.
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Monday, November 10th, 2014 AT 1:36 PM
Tiny
OMEZA
  • MEMBER
  • 13 POSTS
Did you figure it out?
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Thursday, October 31st, 2024 AT 10:14 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
Hi,

I'm sorry but the individual never provided an outcome. Are you having the same issues? Is your vehicle the same year, make, and model?

Let me know.

Joe
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Friday, November 1st, 2024 AT 9:19 PM
Tiny
OMEZA
  • MEMBER
  • 13 POSTS
Same year make and model.
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Friday, November 1st, 2024 AT 9:21 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
Hi,

I am unable to read the IAT sensor reading due to glare. As far as the issue, have you checked to see if the coolant temperature sensor is sending the correct information to the PCM when the engine is cold or below 60°F? Also, the picture you provided indicates -100% on all fuel trims. Is that correct?

Joe
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Friday, November 1st, 2024 AT 9:26 PM
Tiny
OMEZA
  • MEMBER
  • 13 POSTS
Yes engine is running with -100% fuel trim and have lean codes.
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Friday, November 1st, 2024 AT 9:35 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,640 POSTS
If it is negative 100%, it is getting too much fuel and trying to lessen the amount getting to the engine.

Do me a favor. Before you start the vehicle in the morning, check what temperature the ECT is indicating.

Also, let me know the codes you are getting.

Let me know.

Joe
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Friday, November 1st, 2024 AT 10:15 PM
Tiny
OMEZA
  • MEMBER
  • 13 POSTS
Okay.
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Friday, November 1st, 2024 AT 10:15 PM
Tiny
OMEZA
  • MEMBER
  • 13 POSTS
Ect was 40 degrees.
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Saturday, November 2nd, 2024 AT 6:49 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,207 POSTS
Is that short or long fuel trims?
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Saturday, November 2nd, 2024 AT 9:49 AM
Tiny
OMEZA
  • MEMBER
  • 13 POSTS
Both
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Saturday, November 2nd, 2024 AT 10:08 AM

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