Question about 1992 Ford F150 SuperCab

1 Answer

92 f-150 5.0 engine idles at different speed every time you start it up

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 3 Answers

It sounds like it could be a few different things. I would check is to do a diagnostic on the computer to see if there is a problem with any of the injectors. Then I would test the egr,map and oxygen sensor. BUT THE FIRST THING I WOULD DO IS GET A GOOD INJECTOR CLEANER TO ENSURE NONE OF YOUR VALVES ARE STICKING.

Posted on Jun 02, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

1990 vw cabriolet. Thanks guys for the suggestions to my problem but tried it all but still wont start. Both pumps are working, new pressure regulator. It started yesterday but I cranked the engine for a...

Sounds like you have one or both of the belts off by a tooth. Did u use cam locks to hold the camshafts in place. If it is a zero tolerance engine you may have messed a few things up.

Mar 04, 2015 | 1990 Volkswagen Cabriolet

1 Answer

Truck dies when idling

first I would like to tell you, do this procedure only if the 5th digit of your VIN is C or K.


The engine control module (ECM) learns the idle position of the throttle plate to ensure the correct idle. Anytime the throttle body is cleaned or replaced, the ECM must learn the new throttle position. The idle may be unstable or a DTC may set if the throttle position is not learned.

Conditions for Running the Throttle Learn Procedure

• DTCs P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0506, and P0507 are not set.

• The engine speed is between 450-4,000 RPM.

• The manifold absolute pressure (MAP) is greater than 5 kPa.

• The mass air flow (MAF) is greater than 2 g/s.

• The ignition 1 voltage is greater than 10 volts.

Throttle Learn

Important: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code

(DTC) List - Vehicle.

1. Start and idle the engine in PARK for 3 minutes.

2. With a scan tool, monitor desired and actual RPM.

3. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.

4. Ignition OFF for 60 seconds.

5. Start and idle the engine in PARK for 3 minutes.

6. After the 3 minute run time the engine should be idling normal.

Important: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.

* If the engine idle speed has not been learned the vehicle will need to be driven at

speeds above 70 km/h (44 mph) with several decelerations and extended idles.

7. After the drive cycle, the engine should be idling normally.

* If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds

and repeat step 6.
8. Once the engine speed has returned to normal, clear DTCs.
Good Luck

Mar 04, 2014 | 1995 GMC Sierra

1 Answer

I have a 1986 GMC 1500 with a 5.0 and stock rochester carb. The truck will start but you must keep gassing it as it won't idle. It kicks off every time. Any suggestions on how to fix this cold natured

fast idle speed screw, works off the fast idle cam which the choke adjustment sets, it works together by linkages. This is the raised idle speed setting you need to keep a cold engine running. First you set the idle speed by the idle speed screw with engine at normal operating temperature. Then you set the linkage up so the cam is on a raised step, throttle will be held on that raised step. then you can turn the idle speed screw to get idle at about 1500-1800 rpm. Now when you start engine cold, choke will set the fast idle cam on that raised step- when engine starts and runs it should be running at your fast idle setting. That's how it supposed to work, you just have to get everything adjusted right. I hate carburetors, they never stay adjusted right. Considering their complexity and small mechanical parts, no wonder.

Dec 24, 2013 | 1986 GMC C1500

1 Answer

Why does my 2005 mountaineer die when I stop or slow?

The stall problem could be a faulty idle air control valve or dirty throttle body. The computer uses the valve to adjust base idle speed depending on the load on the engine.

Jul 31, 2012 | 2005 Mercury Mountaineer

1 Answer

Car engine interment rough idle

Sounds like possible vacuum leak. Next time it starts try spraying starting fluid around vacuum hoses, if engine speeds up, there is a vacuum leak at that point where you sprayed. Hope this helps.

Jun 11, 2012 | 1995 GMC Safari

1 Answer

After disconnecting the battery, how many hours or miles must the car be driven for the car to do self diognostics

About the only time involved is the 10 minutes to reset the computer to wipe the memory. You do have to get into the situation that caused the fault to repeat the warning. So if you had the fault at 40 MPH and you are idling and stopped, the fault may not repeat until you hit 40 MPH.

This is because some parts relate to speed, some parts relate to Temperature. Like overdrive problems start at speeds when the Overdrive is suppose to work, not at Idle. For temperature, the engine generates different amounts of heat depending on speed and other factors.

Otherwise the self-diagnosis begins when the engine starts. If you had repairs made, give it some time and operate it in the same conditions to insure it is defect free. Two or three trips on the same route ought to be enough.

Sep 21, 2010 | 2001 Ford Taurus

1 Answer

2000 v6 5 spd nissan xterra idles high when in gear and rolling .

From the service manual:

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
1) Make sure that the following parts are in good order.
I Battery
I Ignition system
I Engine oil and coolant levels
I Fuses
I ECM harness connector
I Vacuum hoses
I Air intake system
(Oil filler cap, oil level gauge, etc.)
I Fuel pressure
I Engine compression
I EGR valve operation (If so equipped)
I Throttle valve
I Evaporative emission system
2) On air conditioner equipped models, checks should be carried out while the air conditioner is OFF.
3) On automatic transmission equipped models, when checking idle rpm, ignition timing and mixture ratio,
checks should be carried out while shift lever is in “N” position.
4) When measuring “CO” percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
5) Turn off headlamps, heater blower, rear defogger.
6) Keep front wheels pointed straight ahead.
7) Make the check after the cooling fan has stopped.

3. Open engine hood and run engine at about 2,000 rpm for about 2 minutes under no-load.
4. Perform diagnostic test mode II (Self-diagnostic results). Refer to EC-644.
OK or NG
OK ' GO TO 2.
NG ' 1. Repair or replace components as necessary.
2. GO TO 2.
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.
3. Turn off engine and disconnect throttle position sensor harness connector.
4. Start and rev engine (2,000 - 3,000 rpm) two or three times under no-load, then run at idle speed.
5. Check ignition timing with a timing light.
15°±2° BTDC (in “P” or “N” position)
OK or NG
OK ' GO TO 4.
NG ' GO TO 3.
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
1. Adjust ignition timing by turning distributor after loosening securing bolts.
2. Turn off engine and connect throttle position sensor harness connector to throttle position sensor.
' GO TO 2.
1. Read idle speed in “DATA MONITOR” mode with CONSULT-II.
700±50 rpm (in “P” or “N” position)
1. Check idle speed.
700±50 rpm (in “P” or “N” position)
OK or NG
OK ' GO TO 6.
NG ' GO TO 5.

Mar 25, 2009 | 2000 Nissan Xterra

1 Answer

Volvo v40 1998 model

Could have many causes, but a good start could be to have the
oxygen sensor voltage output checked.(In exhaust system)
This would explain why mixture/ variable idle speed occurs.

Aug 03, 2008 | 2000 Volvo V40

Not finding what you are looking for?
1992 Ford F150 SuperCab Logo

57 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

66126 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21990 Answers


Level 3 Expert

5363 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides