"check engine" light...

Discussion in 'Fox 5.0 Mustang Tech' started by Nemesis2k4, Jul 13, 2007.


  1. Nemesis2k4

    Nemesis2k4 New Member

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    i get in my car and i turn it on and only, so far as i am aware of the only time the light comes on is the key notch before cranking over. now i recently just got a belt on it because the guy before was in the process of relocating the steer pump which i finished. but it had been run over and over w/out alternator so the battery is still getting back to normal. so would the battery cause this light to come on (i dont believe so..) but i also notice that maybe the fuel filter or canister is on its way out because it make a low pitched noise that kinda drowns out....noise is kinda hard to explain. ik this sounds confusing i can clarify if necessary much appreciated
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  2. jrichker

    jrichker StangNet's favorite TOOL SN Certified Technician Founding Member

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    Dump the codes and see what the computer says is wrong…Codes may be present in the computer even if the Check Engine light isn’t on.

    Here's the link to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for years, and it works great. You watch the flashing test lamp or Check Engine Light and count the flashes.

    See http://www.troublecodes.net/Ford/

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    IF your car is an 86-88 stang, you'll have to use the test lamp or voltmeter method. There is no functional check engine light on the 86-88's except possibly the Cali Mass Air cars.

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    89 through 95 cars have a working Check Engine light. Watch it instead of a test lamp.

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    Codes have different answers if the engine is running from the answers that it has when the engine isn't running. It helps a lot to know if you had the engine running when you ran the test.

    Trouble codes are either 2 digit or 3 digit, there are no cars that use both 2 digit codes and 3 digit codes.

    For those who are intimidated by all the wires & connections, see http://www.actron.com/product_detail.php?pid=16153 for what a typical hand scanner looks like. Normal retail price is about $30 or so at AutoZone or Wal-Mart.

    Or for a nicer scanner see http://www.midwayautosupply.com/pc-7208-90-equus-digital-ford-code-reader-3145.aspx – It has a 3 digit LCD display so that you don’t have to count flashes or beeps.. Cost is $30.
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