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Dump the codes and see what the computer says is wrong…

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.

See http://www.troublecodes.net/Ford/
OR
See http://www.dalidesign.com/hbook/eectest.html for more descriptive help
OR
See http://www.mustangworks.com/articles/electronics/eec-iv_codes.html

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.

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 Walmart.

What mods do you have?

I don't get this. I know me and many others have had problems with their car stalling after the first start of the day. Your issue is not the same?

Vac leaks can cause all types of idle problems, and can be a real pain in the A** to find..I suggest pull codes first, then check EVERY vac line. I found mine after about 20x it was in the passenger fender by the shock tower, after that she idled like a champ...even with the H/C/I.

notsoswwuyd said:

no mods to the engine yet. I want to fix what is wrong befor I start modding. I have shot b12 all over the entire engine and found no vac leaks. I will try the code tomorrow, or maybe later today if I feel like it. also how do I know what 2 flashes then 3 flashes then 2 flashes means? would it be a code 232?

Click to expand...

i think JR's links will provide you with the necessary info. pay attention to all codes, esp EGR codes, ACT and ECT codes.

foxes use 2 digit codes; SN's 3 digit codes.

good luck.