Idle issue nightmare
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Sandy, do you need to depress the clutch for the KOEO or just the KOER ?
Thread Starter
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Cross-Country
Joined: Sep 2018
Posts: 95
Likes: 0
When you turn your key on take a photo of the lights that iluminate.
I doubt you have a CEL.
Is your light Red? that would be a Engine Warning Indicator for the Oil Pressure & Coolant Temperature.
CELs are usually Yellow/Orangeish
You may also have a "Emissions" light.
See what lights up when you first turn your Key on.
Now, your could very well have some 1988 technology in her if she is a late in the year build date.
Check your Build date/MFG Date on the sticker inside the drivers door.
I doubt you have a CEL.
Is your light Red? that would be a Engine Warning Indicator for the Oil Pressure & Coolant Temperature.
CELs are usually Yellow/Orangeish
You may also have a "Emissions" light.
See what lights up when you first turn your Key on.
Now, your could very well have some 1988 technology in her if she is a late in the year build date.
Check your Build date/MFG Date on the sticker inside the drivers door.
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Yeah, that one is most likely for the oil and coolant..
You are safe with a build date between Jan & June, three months before Jan you get some leftovers, and three months after June you start getting next years Guinea pig parts.
You are safe with a build date between Jan & June, three months before Jan you get some leftovers, and three months after June you start getting next years Guinea pig parts.
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Yeah, that will go off when you build oil pressure, but come on if you lose oil pressure or overheat.
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Cross-Country
Joined: Sep 2018
Posts: 95
Likes: 0
Thanks a whole lot for your in put . I will try some of the suggestions this weekend -- too damn cold here to do anything else outside tonight
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
I'm assuming you have a tachometer?
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Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Where are you in VA, i'm in the tidewater area for a little while this winter..
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Thanks.
I have added this requirement to my standard position on OPs reporting codes to the masses.....; Will, FYI
Check for Codes, run KOEO & KOER test, let your computer tell you what it knows;
Engines are easier to diagnose over the internet when all the codes are listed, and in order of test.
KOEO - (O) Self-Test Codes =
KOEO - (C)(CM) Continuous Memory Codes =
KOER - (R) Self-Test Codes =
Make sure your A/C, Heat, Radio, etc. are turned off when testing.
Do you have any Non-Stock modifications?
(Air Intake? Smog System? Exhaust System? Ignition System?)
If you have a 6 cylinder & manual transmission, you will have to maintain a depressed clutch pedal for the duration of the KOEO & KOER Self-test.
If using a Digital Code Reader;
The "10" appears during KOEO to indicate the start of Continuous Memory Codes.
The "10" appears during KOER to indicate the start of the WOT test.
I have added this requirement to my standard position on OPs reporting codes to the masses.....; Will, FYI
Check for Codes, run KOEO & KOER test, let your computer tell you what it knows;
Engines are easier to diagnose over the internet when all the codes are listed, and in order of test.
KOEO - (O) Self-Test Codes =
KOEO - (C)(CM) Continuous Memory Codes =
KOER - (R) Self-Test Codes =
Make sure your A/C, Heat, Radio, etc. are turned off when testing.
Do you have any Non-Stock modifications?
(Air Intake? Smog System? Exhaust System? Ignition System?)
If you have a 6 cylinder & manual transmission, you will have to maintain a depressed clutch pedal for the duration of the KOEO & KOER Self-test.
If using a Digital Code Reader;
The "10" appears during KOEO to indicate the start of Continuous Memory Codes.
The "10" appears during KOER to indicate the start of the WOT test.
Lead Driver
Joined: Feb 2002
Posts: 7,972
Likes: 596
From: Greater Austin, Texas
Didnt have a clue you had to depress the clutch while doing the codes --will try that
6 cylinder trucks only. Does not apply to V8 trucks.
Is that all years SD? Or just early ones (87 was first year)? My 460 truck used to be a Six and I don't remember having to do that but I am not sure I ever pulled codes on it before the swap.
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
I see the circuit starting in 1987 thru 1993 for the 4.9L, pin 30 on the EEC in the EVTMs.
I don't see it in 1997, but the 4.9L is history by then.
(I only have EVTMs 80-93 + 97)
I don't see it in 1997, but the 4.9L is history by then.
(I only have EVTMs 80-93 + 97)
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
My 95 must use the clutch for codes. Sandy