Running rich

[mustangjoe87]

I tossed cam and intake on my 87 recently and I thought that I was hearing a miss while it was idling the garage. Figured it was time for a tune up since its been a few years. when I pulled out my old plugs I noticed they are pretty loaded up, well it seems that with my new combo she is running very rich. Here is what I am running, typhoon intake, TFS-1 cam, 75mm Tbody (I know its big, but it was laying around) and the stock heads and injectors. If anything I was figuring that this combo would run on the lean side with all the extra air and no change in fuel pressure. Any suggestions on where to start tunning?

 

[SuperStang90]

I'd try an aftermarket MAF for your 19lb injectors and get it tuned

 

[mustangjoe87]

Speed density

 

[mikeg]

Speed density

You answered your own question. Now change from speed density to mass air.

 

[mustangjoe87]

I'd like to avoid doing the swap right now if I can

 

[SuperStang90]

Speed density

Speed density doesnt like cams. It would be cheaper for you to swap to mass air and tune it then to try and tune speed density

 

[mustangjoe87]

I have a stock harness, A9L, and sensor just don't have the time to swap. Wishful thinking, but I was hoping that maybe I could mess with the fuel pressure or something for the time being.

 

[Sean]

try unplugging the oxygen sensors. See if that helps. The camshaft overlap can trick them into running rich. On a SD car your options are kind of limited. Whats the processor code ?