My 4.0 ranger idles fast between shifts - 1994 Ford Ranger Supercab

Let's take a WILD guess that it is a Ford Ranger! :>D

Full 'year make model' in ALL questions please!

https://www.google.com/search?q=Ford+Ranger+4.0+V6+Idles+too+fast

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-Check vacuum lines. It might bend or clog.


Good Luck


Mai

engine check light should be on
check theses things
engine timing
idle control valve
TPS
crank angle sensor

it's probably the auto. choke out of adjustment. there's no idle adjustment on mine .i guess u could bend stop or something??

Do you have a service engine light on? If so the first thing to do would be to check for what codes may be stored.
You can also check for vacuum leaks. A good place for a leak is the TB base gasket. Those start to leak and give a fast idle.
As for the late shifts, just about all you can do is check fluid level. The shifts are computer controled. 93+ trucks have the 4L60E. Not even a TV cable to check adjustment on.
Fix the fast idle and the late shifts issue may go away.

the engine computer is rasing the idle speed when ever the a/c compressor starts to operate. So it is adding too much air and therefore fuel. The duty cycle of the fast idle solenoid or compensator is off. Check the idle air controls.

well the fast idle is most likely caused by a leaking upper intake runner base gasket, this high idle may be related to the trans no engaging, fix the idle problem by remove the upper intake runners and installing a new base gasket and keep your fingers crossed

chk the MAF sensor. first sensor in duct coming out of air filter. Good luck.

I say air by o2 sensor or if you have done that already tried the vaccum hoses for tiny tiny holes
good luck

I would look for a vacuum leak. If you stand outside the car with the hood open while the car is running you might be able to hear which vacuum hose is leaking. Considering the age of that car I would have a very good look at any vacuum hose or the hose going to the power brake booster (if the truck has power brakes)