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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Posted on Jan 02, 2017

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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

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

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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