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Racing idle in 1985 ford ranger 4cyl.2.3 l efi

MY RANGER'S IDLE DOUBLED WHILE DRIVING THE OTHER DAY. NOW,EVERY TIME I START THE ENGINE,IT'S RACING AND WON'T SLOW DOWN BUT WHILE THE TRUCK'S MOVING,IT DRIVES NORMAL 'TILL I STOP AGAIN.COULD IT BE THE IDLE SPEED SENSOR OR WHAT??? THANKS IN ADVANCE. HOW SAFE IS IT TO DRIVE THIS WAY,(TEMPORARILY),?

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  • Anonymous Apr 30, 2008

    My 90 Tempo 2.3 liter idles fast and the idle wanders. it slows down immediately when the bypass orifice ahead of the throttle valve is blocked.
    it also fouls easily when starting.

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I would reccomend checking the fuel pump for starters, it maybe getting "stuck."

Posted on Aug 01, 2009

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Jan 27, 2016 | 2003 Ford Ranger Regular Cab

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2.8 v6 ford ranger runs rough at a idle how do I fix this


Being an 85, I would start by replacing all the vacuum lines and fittings, along with the pcv valve. Next would be a tune up, clean the throttle/carb and a fuel and air filter.

Aug 31, 2014 | 1985 Ford Ranger

1 Answer

Engine racing


time to join the toyota death club.?.. LOL !!!!
eg; floor mats hitting throttle???? nah, nobody is that daft.
which engine options?
1.3 L M13A I4 (petrol)?
1.5 L M15A I4 (petrol)?
1.3 L I4 (diesel)?

but is ok, parked, with trans in neutral??????????
the normal RPM is about 800 hot.
not the word hot, it must be. it must be hot, 180F min. holding
hot. does it? we use a $9 scan tool to scan the ecu
and look at the ECT, does it show, 180F?
like this shows. driving dead cold the engine, warms, see it?
http://www.fixkick.com/my96-16v/TP-MAF-VSS-ECT-FUEL.JPG
the blue line, that is ECT, engine coolant temp sensor.......?
ok we got past rule one, and all fuse are good, we check.

The ECU (EFI BRAIN) in your car controls idle at all times.
GAS ENGINES, diesel we dont have here, in 2005 USA.
in your case, (hot) it does not, so can be only 2 things.
1: the ISC is messed up. (stuck open, so clean it.)
or
2: the EFI fueling is bad, causing #1.
the EFI controls might go rich or lean, and there can be air leaks in to the air intake system, (induction) on MAP engines, it races fast.
on MAF engines, it goes lean and idles slower.
i have no idea what system you have as my on line source skips 2005

what country?
is the CEL glowing key on?> check engine lamp
then stays out running>>>>>?????
do you have a maf sensor on the main air pipe? some are hidden in the throttle body. on some suz.
i believe this car is MAF based, (with map used for EGR tests only)
on very new cars, the MAF can fail, and the ECU is so smart
it can start using the MAP as backup,
or on some newer cars, it uses both , map works best at idle.
most mAF do a poor job at air flow reading at idle, (touch)
that is whats out there......
what does all this mean, simple
you start the engine, the CEL stays glowing, scan it.
you scan it and find the MAF is dead./ engine is in limphome
and in limphome mode idle controls can be DEAD>
ok CEL is out
engine hot, EFI is in CLOSED loop at idle and LTFT is like -4%
long term fuel trim. looks good, so if idle is wrong
the ISC is BUNGED

see what i did there , i used a $9 scan tool to tell me
the EFI fueling is good. so the ISC is bad.
the ISC can be 1 to 3 parts. (iac/iSC parts)
if any stick , it races. or stalls , depends on where is stuck
its just and air valve.
on MAF systems the ISC uses metered air and fuel is mixed perfect
so if it sticks open fueling is perfect and idle is RACING.
that is how EFI works. (fuel,idle, not spark)

i found what you had on the swift forum..... no lack of info there.

random page
http://www.teamswift.net/viewtopic.php?f=11&t=49725

most the questions answered this page are wrong cept last.
the maf on your car has extra capacity, so a bigger one does NOTHING. and the closed loop , will cancel the kids fiddling .
they dont understand EFI.
read

Greg Banish books to see how

all the bits work together. including how hard it is to get idle controls to
work right, its the last thing that does,,,,, work right.
ifcar has MAP total system (speed density ) most of my comments above are bunk,,,,
on SD systems, all air leaks, cause RACING ! apples and oranges different. they are...
to work efi , you need to first know what is there.....

Jan 22, 2014 | 2005 Suzuki Swift

1 Answer

How to adjust idle?


hot engine ?, cold or both,, EFI runs in 3 modes, cold ,warm and hot.

name it.

which engine option (displacement)??????



there is no idle adjust, that is the PCMs, job 100%, all the time.

Carbs are gone.

here is rule one for all EFI.

idle is the last thing to work correctly.

anything the causes a gross imbalance of engine power to engine load, under idle will cause , idle controls to fail.



low idling causes. (over 50 but, here ar basics)

1: AFR (air fuel mixture too lean) usually surges. (clogged or leaking injectors. or fuel pressure way to high)

2: air leaks, cause racing, so not that. (speed density car ,if is)

3: egr stuck open. low idle and misfire.

4: ISC stuck closed (IAC electric)

5: cam belt slipped, timing retarded, compression at 1/2 spec, and well, valve will bend soon....

6: CEL glowing running? can be in limphome, limp cancels Idle controls (in may cases) RTM read the FSM on DTCs.



if fails hot?, is hot = 180F temp or more? "thermometer time"

if not, the PCM goes , quite nuts.

Dec 23, 2013 | 2010 Honda Civic LX

1 Answer

2003 ford ranger intermittent idle


One possibility is a buildup of dirt and sludge in and around the idle air control valve. The buildup causes the idle air valve to stick.

Jun 24, 2012 | 2003 Ford Ranger Regular Cab

2 Answers

Ford ranger problem with engine racing have to turn off truck engine at light or stop signs to stop the truck


remove and clean idle air control (IAC) this is what controls idling of vehicle. have a good one !! and check out the wires for breaks or wear.

Apr 30, 2011 | Ford Ranger Cars & Trucks

1 Answer

85 ford ranger idles up high then drops down and will die unless give it a little gas. heard it could be egr. where is that on motor? thanks for your help!!!!


it could be the egr valve, located driverside at rear of engine, will have an electrical plug in to it also,simly unplug and 2 bolts that hold it onto the motor. but i do suggest you check it for a bad idle control sensor 1st look on top of motor at the air induction for a round silver canister about 4inches long and 2inches round with an eletrical plug in ,it will have 2 small bolts holding it onto the motor. i suspect that to be your problem, unless it misses bad while driving it. if your only problem is with the idle, i suggest you start with that idle control sensor 1st and as always thank you for choosing fixya.com

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2 Answers

2004 Ford Ranger Low Idle


I figured out what was going on. supposedly on ford rangers the Idle Air Control Valve (IAC Valve) goes bad. i got a trouble code looked it up and sure enough it is the IAC Valve. Under 100 bucks for the part

Jul 04, 2008 | 2004 Ford Ranger

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