Spark help

[J90GT]

hello, i picked up a half built 90 GT Mods are as follows


Ported stock heads
1.6 cranes
B-cam
Typhoon intake
CAI with 73mm MAF #30 with 30lbs injectors
Diablo chip
SHorty headers to straight pipes with flowmaster dumps
bbk 70mm TB



It was just dynoed a few weeks ago made 262HP/283TQ, seems OK


So i purchase the car few days ago, it pops and gurggles when i left off the gas. So i assume the spark is jacked up. Should i run a colder plug with this set up even though its pretty mild or just gets replacements? and what GAP. Should be used? Thank you

 

[J90GT]

Help?

 

[jrichker]

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.

 

[J90GT]

Thats the problem the CEL isn't on. I put a new distributer,wires,02's it has a new TB so the TPS is new it was just dynoed/chipped 2 weeks pryor to me buying it with a dead even 13.5 A/F.

Now its running pig rich, If i turn on the a/c i can get high off the gas fumes coming thru the vents. Im at a loss here, only thing i havent replaced would be plugs which were black but i doubt that is the sole problem.

 

[jrichker]

The CEL light does not have to be on for there to be codes stored in the computer.

The 30 lb injectors are way too big for a 302 with no power adders. The computer would have trouble trimming the injector pulse width to give a suitably lean mixture for street use.

 

[srothfuss]

The popping / backfiring is from unburnt gas igniting in your exhaust (FWIW)

Get some smaller injectors, check your timing

 

[J90GT]

timing was set at 36 degrees advanced seems kinda way out ???



I think i'll just swap out the maf and injectors for some 24#'s and start from scratch

 

[srothfuss]

Did you check your timing with the PIP sensor unplugged? It should be around 10 Degrees (stock ) and usually up to 14 Degrees (tuned)