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1987 Ford Ranger 2.3L Idles Bad
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dmill87
New User
May 2, 2009, 12:44 PM
Post #1 of 3
(4602 views)
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1987 Ford Ranger 2.3L Idles Bad
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1987 Ford Ranger XLT 2.3L I4 102907.3 Miles
My truck has had an idling problem since the first cold weather in 2008, my engine runs fine the first time i start it in the morning, but after that when i go to leave school, the problems begin.
The RPM's begin to drop immediaty, and my engine misses, and wants to die until i hold the gas at around 2100 RPM for a while. then the RPM's jump up 300 on their own and i let off the gas and it returns to normal.
checked for Vacuum Leaks- None
checked Idle Speed- good
checked Idle control Sensor/Valve & Idle Bypass Valve-good
Not burning Oil
Cleaned entire fuel system including Throttle Body
checked plugs and wires- gaps good normal wear and tear, wires good (total of 9000 miles on them)
Please help
My uncle has suggested that it is "loading" the Cilynders but I dont know
P.S.
Can this hurt my engine?
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Hammer Time
Ultimate Carjunky
/ Moderator
May 2, 2009, 1:04 PM
Post #2 of 3
(4600 views)
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Re: 1987 Ford Ranger 2.3L Idles Bad
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Is the check engine light coming on at all?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
Veteran
/ Moderator
May 2, 2009, 1:40 PM
Post #3 of 3
(4598 views)
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Re: 1987 Ford Ranger 2.3L Idles Bad
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dmill; Since this runs okay when cold, sounds like it is overfueling as your uncle suggested. A cold engine needs a lot of fuel, but as it warms, it can't handle that extra fuel. There a quite a few possiblities/causes. Some basics to check: PCV system; Make sure it is clean and working (if plugged, can cause a rich condition). CTS (coolant temp sensor) These will generally default to -41F when they go bad or if the connection is poor; This will cause a rich condition because the PCM thinks that you are in Fairbanks in January. Oxygen sensor. This tells the PCM the air/fuel mixture and adjusts accordingly. MAP (manifold absolute pressure) sensor. This reads engine vacuum to tell the computer when you are under load, thereby increasing fuel delivery. Make sure you have a manifold vacuum source to the sensor. Don't go replacing parts until you've tested them. Most parts stores can pull any trouble codes for you, but these early generation PCMs aren't what they are now, and will take some testing once you get the codes, or you will have to manually test each one.
Loren
SW Washington
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