5.0 fuel injection big problem

[blackdoutstang]

i have a 5.0 with roush 200 heads,trick flow track heat intake,bbk 75mm throttle body,adjustable fuel regulator,stock ignition system,75mm mass air.

my problem is the fuel system was stock and it started to break up at 4000 rpm and back fire through intake so i up grade throttle body and regulator and fuel pump. the problem is still there, so i changed distributor cap and have adjusted fuel pressure. im out of ideas and i no nothing about fuel injection please some one give me ideas.

 

[Daggar]

Chances are that your ignition system is weak.

Coil, wires, even spark plug gap can effect how this acts.

 

[jrichker]

A high speed miss when warm is oftem a sign of a TFI module going bad. The TFI module is mounted on the distributor on 86-93 model cars, and remotely mounted on 94-95 model cars.

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.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.

Or for a nicer scanner see http://www.midwayautosupply.com/detailedproductdescription.asp?3829 – It has a 3 digit LCD display so that you don’t have to count flashes or beeps.. Cost is $35.