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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 04-05-2007, 02:56 AM   #1  
91ford302
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Default check engine

i know the check engine light can mean a ton of things and i know my car is OBD 1 so like noone can hook up to it, so how am i supposed to know what the check engine light is coming on for? It just started tonight as i came home from work. every time it upshifted (AOD) the light came on for a second, then went back off as the rpms went up. I was wondering if anyone else has had this same thing happen and knows what it might be, or how i can figure it out myself. I know some cars you can use a jumper wire or mopar you can turn the key 3 times, but havnt heard a trick like that for fords.

the only thing i could think it was right now is like a rich or lean reading because its just shifting so the engine is a low rpms in a higher gear and maybe the car is compensating enough. I also know i need to replace the fuel filter, so i was thinking it may be a fuel related problem. Any help is appreciated.
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Old 04-05-2007, 02:54 PM   #2  
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Default RE: check engine

bump. [&:]
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Old 04-05-2007, 02:58 PM   #3  
Joel5.0
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Default RE: check engine

All you need is a test light, VOM or use the CEL to count the codes....... TroubleCodes.net- engine & OBD2 Trouble Codes and Technical info & Tool Store.
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Old 04-05-2007, 05:56 PM   #4  
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maybe a bad 02 sensor? check engine codes on computer.......Good Luck!
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Old 04-05-2007, 07:06 PM   #5  
91ford302
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Default RE: check engine

ok i looked at that site on the whole checking engine codes, but i can make sense of it. it doesnt say anything about the 5.0, nor does it say where this hand drawn connector is located. a little better explanation would be appreciated. thanks.
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Old 04-05-2007, 09:33 PM   #6  
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Default RE: check engine

the connector on your car "should" be under the hood,drivers side between firewall and the strut tower and u can get an obd 1 tester for cheap from auto zone or any other parts store....
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Old 04-05-2007, 09:42 PM   #7  
p1bigun
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Default RE: check engine

autozone will pull your codes then walk back pick up a haynes book and write down what it is or you could post them here and someone will to=ell you what they are
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Old 04-05-2007, 09:44 PM   #8  
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sigh... autozone doesn't sell anything capable nor do they test OBD 1
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Old 04-06-2007, 12:31 AM   #9  
91ford302
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yeah OBD 1 is outdated, and i know autozone does not check it. I will try to find the connector and pull my codes this weekend and see whats up. thanks.
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Old 04-06-2007, 12:41 AM   #10  
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Default RE: check engine

autozone does have an OBD 1 tester, its $30 or you can buy the one that is for OBD I and II for 379.00
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