Question about 1989 Ford F 150

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1989 ford f-150 5.0 L EFI does not want to idle when engine is cold or hot.

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Usaully the iac is the problem this is the idle speed control valve it sticks it burns or you have a vacume leak making it not work if you have a scanner to check codes it will code for something easy take hose off the entrance to throttle body clean with clean rag the pallet it will be black and then unplug the iac valve located bolted to the throttle and whatch what will happen if it stalls or idles up higher after starting

Posted on Jan 03, 2011

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My 89 f-150 300,000 miles starts great runs great with good oil pressure never been hot loses power at times and will die when idling. the check engine light comes on immediately when this happens and


check all vacuum hoses for deterioration /hard /loose. Check power brake booster for air leaks with the foot on the brake (idle will drop or stall)

Nov 22, 2014 | 1989 Ford F 150

1 Answer

Idles@2500 rpm until engine warms up


old post
all do, everyone. but. the devil really is in the details with EFI.
this IAC valve does that,
to speed it up warm up , put in a 195F thermostat.
this assumes 800 RPM is hot.
most of these engines, do this. new. bewlow.

1: cold start, for 3 to 15sec, 2500 rpm , worse in alaska.
2: then the above DASH pot closes and IAC takes over, at ~1200
3: then as engine heats the IAC closed inch by micro inch a
its now 100% closed and the ECU not controls idle hot.
using the modulated ISC,
there is a fast idle feature on this year, 950 to1000 rpm hot
with these turned on.
1. headlights hot.
2: defrost glass, rear.
3: heater fan on.
4: a/c on if opted.
other wise 800 is normal hot.

Jan 13, 2014 | 1989 Geo Tracker

1 Answer

Will not idle when cold


Its cold start issues:----
Go through the list of help links mentioned below:----

Click the link :----

Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html
----------
Low idle when cold out side?
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
--------------
Ford explorer 4.0 will not idle when cold?
http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html
--------
Automatic transmission shift lever hard to move on cold mornings?
http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
----------
Car won't start when cold?
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
-----------

It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

Ford Expedition IAC valve replacing

http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

-----------

Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

------------

1999 Ford F-150 Idles rough and quits when gas pedal is pressed less?

http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

---------

Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

------------------

Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

-----------


Cold start problem and vehicle shudder around 2500 to 3500 rpms

http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

----------

Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

-----------

GMC Sonoma Stalls and idles low

http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

--------


GMC Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

-------------

1996 Camry intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

------------

Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

-----------

Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

---------

High Idle Problem

http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html

-------

While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------

Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

--------

High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-------

Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

----------

Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

-----------

While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

---------

These details will help.

Thanks.

Dec 14, 2012 | 1999 Jeep Wrangler

1 Answer

1989 ford f 150 6 cilinder 4.9l is running hot how can i fix this


Start with a good coolant flush.(This should be done every 2 years anyway). Next move to (check or replace) the thermostat and then on to the water pump. Check all water hoses for hardness or blockage. (Bottom radiator hose should have a spring in it). Last, with your head behind the raised hood , idle the engine at about 12-1400 rpm and listen for the clutch fan to come in or go out. Good luck.

Aug 08, 2010 | 1989 Ford F 150

1 Answer

Changed plugs and plug wires in 1989 F 150 and it runs rougher than before need diagram


V8 engines as follows:

289,302,5.0L(Carb.)
390,406,427,428
400,460

(cyl numbers)

Front (engine)
5 1
6 2
7 3
8 4
(firing order)
1-5-4-2-6-3-7-8


5.0L EFI
351, 5.4L, 5.8L

(cyl numbers)

Front (engine)
5 1
6 2
7 3
8 4
(firing order)
1-3-7-2-6-5-4-8

Hope this helps, let me know.

Aug 03, 2010 | 1989 Ford F 150

1 Answer

Check engine light on, dies when cold and idle sounds slow


could be a number of problems..im not sure if your suppose to recommend sights here or not but id go to http://www.ford-trucks.com/forums/forum28/ im a member myself

Jan 20, 2010 | 1989 Ford F 150

2 Answers

I have an 1989 F150 with the EFI 5.0L engine with a high idle problem.


idle air control . unplug it and see what happens.

Jan 14, 2010 | 1989 Ford F 150

1 Answer

I have an 1989 F150 with the EFI 5.0L engine with a high idle problem. In park it idles between 1500-2000rpm. In drive, it drops to 1000-1500. I've replaced the idle sensor and that didn't help. What else...


Your intake manifold has a leak. Check all the hose connections to see if you have a hose off.
Disconnect the EGR hose and temporarily plug. If it helps it is the EGR.
Take a spray bottle of water and spray around the intake manifold while the engine is running. When you find the leak it will draw in the water and stall the engine or at least affect idle.
Another part is the TPS, throttle position sensor which is on the drivers side and about the size of a cigarette lighter. It has 2 screws and 1 electric plug.
Have Autozone scan your truck for free.

Sep 18, 2009 | 1989 Ford F 150

1 Answer

Eratic idle


have u checked for upper intake leaks? use a can of carb spray and spray around base of upper intake, u will know if u have a leak righ away.

Mar 02, 2009 | 1989 Ford F 150

1 Answer

Ignition Timing


Initial Timing 10 degrees before top dead center NOTE: Initial timing is measured with engine at normal operating temperature and Spark Output (SPOUT) connector disconnected or shorting bar removed.
rpm should be arrown 850
excuse the delay but been so busy

Jun 08, 2008 | 1989 Ford F 150

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