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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 05-23-2008, 10:06 PM   #1
RoadsterRider
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Default Check Engine Light(HELP!)

So I've got my 88 mustang running perfectly, it passes the actual emissions portion of the smog test easily, but I've got one thing holding me back. The check engine light comes on while it's turing over, instead of coming on when the key is turned to the "ON" position and turning off when the starter is engaged. Any ideas?

Thanks,
Cory
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Old 05-23-2008, 10:14 PM   #2
Joel5.0
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Default RE: Check Engine Light(HELP!)

Yep..... that's normal for non-Cali '88 setups.... the CEL became "functional" in '89+ models.
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1986 GT-X303-289 heads-1.72 rockers-RG 4+1 Trans.
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Old 05-23-2008, 10:15 PM   #3
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Default RE: Check Engine Light(HELP!)

It's cali(sorry, I should have specified).
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Old 05-23-2008, 10:25 PM   #4
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Default RE: Check Engine Light(HELP!)

run a koeo/koer test and see if any codes are output if not..don't worry about it
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Old 05-23-2008, 10:26 PM   #5
Joel5.0
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Default RE: Check Engine Light(HELP!)

No prob...... checked the MIL strategy in the GUFB document for the '88 Cali strategy, and it is normal. Here's the document extract.

Quote:
Additional features of the MIL are:

1. It is disabled during VIP tests.
2. It is turned on continuously in CRANK mode until a PIP is detected as a
bulb check.
The bulb check can be disabled by setting MILLIM equal to
zero.
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1986 GT-X303-289 heads-1.72 rockers-RG 4+1 Trans.
Quote:
Originally Posted by Joel5.0
Great thoughts will overwhelm a feeble mind.
There is never money to do it right, but there's always money to do it over.
The proof of understanding is the ability to explain it. (H. Torruella)
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Old 05-23-2008, 10:27 PM   #6
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Default RE: Check Engine Light(HELP!)

Quote:
ORIGINAL: mjr46

run a koeo/koer test and see if any codes are output if not..don't worry about it
I wouldn't worry about it if i could smog the damn thing, but as it is I can't smog it and therefore can't register it.
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Old 05-23-2008, 10:29 PM   #7
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Default RE: Check Engine Light(HELP!)

So it's fine? Damnit, how do I prove that to the smog place? I might just have to take it somewhere else. DAMNIT!

Thanks for your help

You wouldn't be able to point me in the direction of some sort of proof, would you?
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Old 05-23-2008, 10:31 PM   #8
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Default RE: Check Engine Light(HELP!)

if they are not allowing it to be tested and don't know the foxes ecm strategy sounds like you needs to edumacte dem some!!
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Old 05-23-2008, 10:54 PM   #9
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Default RE: Check Engine Light(HELP!)

What MJ said...... they need to check the requirements for the year of your car, not use the existent ones and make them retroactive..... that's a loose-loose situation. Here's a snapshot of the strategy document from FoMoCo.... it should help you prove your case.

Click the image to open in full size.
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LUK=Let Us Know, GL=Good Luck, LMK=Let Me Know, JIC=Just In Case, BTSTDTRT=Been There Seen That Done That Repaired That, YCYDYP=Your Car Your Dough Your Prerogative and the classic... DILLIGAS=Do I Look Like I Give A S***

1986 GT-X303-289 heads-1.72 rockers-RG 4+1 Trans.
Quote:
Originally Posted by Joel5.0
Great thoughts will overwhelm a feeble mind.
There is never money to do it right, but there's always money to do it over.
The proof of understanding is the ability to explain it. (H. Torruella)
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Old 05-23-2008, 10:54 PM
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