IDLE
Thread Starter
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
I don't know what CM means.
I haven't done the Key On Engine Running test yet.
Thread Starter
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
Haven't dealt with Ford ignition systems before, but many will not run without the IAC. A lot of systems close the throttle completely, and use the idle valve to supply the idle air. If unpowered is default close, then it would die with no idle air.
Have you replaced, or at least cleaned it? Sounds like you're off with air/fuel mixture. The AC pickup probably provides just enough speed to keep it running. Try putting the truck in N and a slightly revving with the A/C off as you come to stop, see what happens.
If you haven't clean the IAC then get some throttle cleaner and 2 paper towels. spray until you can hear the element moving.
Is the IAC controlled by a 2 or 3 wire harness? I had two wires that measured the power feedback from the internals of the IAC. Connected test leads to them and ran the wires into the cab.
Doe the IAC have two short, molded, rubber hoses connecting it to both sides of the throttle body? Take those off and manipulate them to check for cracks. Can't always be seen on the car.
Have you replaced, or at least cleaned it? Sounds like you're off with air/fuel mixture. The AC pickup probably provides just enough speed to keep it running. Try putting the truck in N and a slightly revving with the A/C off as you come to stop, see what happens.
If you haven't clean the IAC then get some throttle cleaner and 2 paper towels. spray until you can hear the element moving.
Is the IAC controlled by a 2 or 3 wire harness? I had two wires that measured the power feedback from the internals of the IAC. Connected test leads to them and ran the wires into the cab.
Doe the IAC have two short, molded, rubber hoses connecting it to both sides of the throttle body? Take those off and manipulate them to check for cracks. Can't always be seen on the car.
I believe the IAC harness is 3 wires. Nothing else going to it but those wires.
Thread Starter
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
I am heading to Gary Lewis's house tomorrow morning to replace some axle pivot bushings and install a trailer hitch so I can pick up a 1980 F150 for some parts. Maybe he and I can fool around with the self tests and get it to work then.
Postmaster
Joined: Jan 2012
Posts: 3,462
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From: Richmond
Could be, but do you have hesitation, jerking, or stumbling when accelerating? Anything while maintaining a constant speed, especially at highway speeds?
If y'all have a spare IAC between you try it real quick.
If y'all have a spare IAC between you try it real quick.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
The engine is not supposed to run with it disconnected, the computer controls the idle speed.
Just ground the self-test-in wire to ground, get in the cab, turn the key to RUN and see what happens. My Tempo doesn't have a CEL light but the computer blinks the SHIFT light at me. See if there's something in your truck that it would blink at you, I'd guess the EMISSIONS light in the top-left corner.
Only if there aren't any blinkenlights in the cab do you need to use the testlight/voltmeter method.
You're not reading the instructions, man, all that stuff is explained....
Fuel Injection Technical Library » How To Run a Self-Test
Thread Starter
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
Exactly correct; in fact, it's part of the diagnostics... start engine, let idle, disconnect IAC... does engine die, yes or no? Different steps to follow next depending on the outcome.
The engine is not supposed to run with it disconnected, the computer controls the idle speed.
Yes, key-on-engine-off.
Just ground the self-test-in wire to ground, get in the cab, turn the key to RUN and see what happens. My Tempo doesn't have a CEL light but the computer blinks the SHIFT light at me. See if there's something in your truck that it would blink at you, I'd guess the EMISSIONS light in the top-left corner.
Only if there aren't any blinkenlights in the cab do you need to use the testlight/voltmeter method.
You're not reading the instructions, man, all that stuff is explained....
Fuel Injection Technical Library » How To Run a Self-Test
The engine is not supposed to run with it disconnected, the computer controls the idle speed.
Yes, key-on-engine-off.
Just ground the self-test-in wire to ground, get in the cab, turn the key to RUN and see what happens. My Tempo doesn't have a CEL light but the computer blinks the SHIFT light at me. See if there's something in your truck that it would blink at you, I'd guess the EMISSIONS light in the top-left corner.
Only if there aren't any blinkenlights in the cab do you need to use the testlight/voltmeter method.
You're not reading the instructions, man, all that stuff is explained....
Fuel Injection Technical Library » How To Run a Self-Test
edit: ok I did read through the above link earlier. I think I realize what I did wrong. I did ground the STI, but I hooked my test light to the neg terminal, the directions say positive terminal. Darn, i will have to go out and try again.
I thought you were supposed to use a jumper wire somewhere the last time I did this. Am I reading the instructions wrong? I don't see a jumper wire in the instructions at all.
Last edited by RAY1986F150; Jul 27, 2012 at 09:17 PM. Reason: ding dong
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Only with the voltmeter/testlight method do you need a jumper (according to this different set of instructions):
Ford Ranger/Bronco II EEC-IV Testing
I no longer do the volt/test thing, why bother if it will flash a light at me on the dash.
It wouldn't surprise me if a PO took the bulb out of the EMISSIONS lamp because they couldn't figure out how to make it go off.
Ford Ranger/Bronco II EEC-IV Testing
I no longer do the volt/test thing, why bother if it will flash a light at me on the dash.
It wouldn't surprise me if a PO took the bulb out of the EMISSIONS lamp because they couldn't figure out how to make it go off.
Thread Starter
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
OK. I got it to do this KOEO:
Blink Blink -pause- blink blink -long pause- blink -pause- blink blink -pause- blink blink
edit: ok, after re-reading the instructions my blinks mean that no errors have been recorded by the computer.
Blink Blink -pause- blink blink -long pause- blink -pause- blink blink -pause- blink blink
edit: ok, after re-reading the instructions my blinks mean that no errors have been recorded by the computer.
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Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
That's a Code 22, given to you twice.
There should then be a long pause, a single blink, a long pause, then more codes given to you twice. These are the CM codes, very important.
You can do this multiple times but don't disconnect the ground midway in testing, I'm pretty sure that'll clear the codes (which we don't want to do).
There should then be a long pause, a single blink, a long pause, then more codes given to you twice. These are the CM codes, very important.
You can do this multiple times but don't disconnect the ground midway in testing, I'm pretty sure that'll clear the codes (which we don't want to do).
Thread Starter
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
Its a new MAP sensor i replaced it last year. I have the old one also. I swapped them out the other day and got no change.
The code I got was exactly the same as what the instructions say
"
Blink – 2 sec – blink – 4 sec – blink – 2 sec – blink – 6 sec – blink – 6 sec – blink – 2 sec – blink – 4 sec – blink – 2 sec � blink
This translates into 11-11 current condition (KOEO) and 11-11 in the continues memory (CM); or SYSTEMPASS"
The code I got was exactly the same as what the instructions say
"
Blink – 2 sec – blink – 4 sec – blink – 2 sec – blink – 6 sec – blink – 6 sec – blink – 2 sec – blink – 4 sec – blink – 2 sec � blink
This translates into 11-11 current condition (KOEO) and 11-11 in the continues memory (CM); or SYSTEMPASS"
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
It will give you the entire string of errors twice. IOW say it wants to report 22, 37,95, it'll do:
22
37
95
long pause
22
37
95
long pause
1
long pause
CM codes twice, like above
Even if the system passes and everything is OK, it'll give Code 11
Unless.....
It's a more modern OBD1 system in which case it will give 3-digit codes and a 111 for System Pass.
It will never mix 2- and 3-digit codes.
22
37
95
long pause
22
37
95
long pause
1
long pause
CM codes twice, like above
Even if the system passes and everything is OK, it'll give Code 11
Unless.....
It's a more modern OBD1 system in which case it will give 3-digit codes and a 111 for System Pass.
It will never mix 2- and 3-digit codes.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Its a new MAP sensor i replaced it last year. I have the old one also. I swapped them out the other day and got no change.
The code I got was exactly the same as what the instructions say
"
Blink – 2 sec – blink – 4 sec – blink – 2 sec – blink – 6 sec – blink – 6 sec – blink – 2 sec – blink – 4 sec – blink – 2 sec � blink
This translates into 11-11 current condition (KOEO) and 11-11 in the continues memory (CM); or SYSTEMPASS"
The code I got was exactly the same as what the instructions say
"
Blink – 2 sec – blink – 4 sec – blink – 2 sec – blink – 6 sec – blink – 6 sec – blink – 2 sec – blink – 4 sec – blink – 2 sec � blink
This translates into 11-11 current condition (KOEO) and 11-11 in the continues memory (CM); or SYSTEMPASS"
Now, do the KOER test, be sure to do your part when prompted to. Basically it will blink at once or twice, after which time you floor the throttle & release, then hold the brake and turn the steering wheel half a turn, then let off the brake.
Thread Starter
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
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