1997 Ford Ranger stalling and rough idling

HALFMOONTOET

MEMBER
1997 FORD RANGER
6 CYL
2WD
AUTOMATIC
213,000 MILES

My ranger runs good while the weather is warm, but as soon as things begin to cool down it begins acting up. While giving it gas it runs fine but when you let off the gas it begins running rough. When you stop at a redlight or stop sign it will stall. It will stall running in park sometimes. I have had the Iac valve replaced and the pcv valve as well. Trouble usually starts when weather dips into the 60's.

Thursday, November 5th, 2009 AT 11:12 AM

3 Replies

RENAUDTN

MECHANIC
636 POSTS

Have you checked for trouble codes?
From your description of the symptoms, I'm tempted to think your IAT (intake air temperature) sensor may be defective. It's located either in your intake manifold or it's built in your MAP sensor (which is located in your intake manifold as well). Basically your computer relies on this sensor's input to know the air density and changes the air/fuel ratio consequently.
Have your mechanic check that. If you're mechanically inclined and you have a scan tool or a DVOM you can check this sensor yourself.
Let me know

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Thursday, November 5th, 2009 AT 4:32 PM

HALFMOONTOET

MEMBER
2 POSTS

I replaced this sensor and it has helped the rough idling a good bit, but It still stalls when I stop. It takes a few moments for it to stall and if I get to the gas pedal before it does I can keep it running. I'm sorry it took me so long to reply to you.

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Sunday, November 29th, 2009 AT 1:04 PM

RENAUDTN

MECHANIC
636 POSTS

Hello there,

Glad the new sensor helped.
As far as your stalling problem, it could be a number of things. I would check the fuel pressure first. I would also check for vacuum leaks, and I'd take a look at my MAP and my TPS sensors.
Have you scanned the car for codes?

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Sunday, November 29th, 2009 AT 7:09 PM