dlazrael

I was idling outside the DMV waiting for a friend, and I smelled gas (windows were open). So I sniffed around the car (I imagine it looked silly as hell) and found the scent of unburned gas from the exhaust, more promenant after I rev the motor up. Correct me if I am wrong, but this sounds like a 'rich' condition. This only occured recently, after the diablo tune, and after I changed to 10w30 gtx synthetic oil. Any other ideas? I had a mech run a pressure check on the fuel lines, and they're fine... and its not leaking anywhere...

2000GT4.6

Is it a mail order tune or a custom dyno tune??

If its a mail order tune chances are it is acutally costing you power. I was losing close to 10 RWHP with my mail order diablo chip back when the car was at full boltons.

dlazrael

its the handheld tuner..

2000GT4.6

Have you got the car on a dyno to check the a/f ratio? I don't see the point of the handhelds unless you dyno tune the car with em, or at least check the A/F ratio.

If you changed the fuel there is every chance you went to far and got it rich. Hit a dyno and check it out.

kendiesel

Mine does the samething, but it runs rich until you hit the high r's. What's it idleing at?

dlazrael

i changed the idle to 854. I hadn't touched the fuel untill today, where I leaned it out 1% (or w/e the #1 is, % or what have you) on the hand held. I dont have the cash floating around righ tnow for a dyno. I used the "performance" tune that comes designed for the 99-04 mustangs

2000GT4.6

I wouldn't mess with the a/f ratio unless you can check it with a meter.

dlazrael

Are there any other ways to check a/f without a dynamometer?

2000GT4.6

Not cheaply

Dyno runs only cost between 35 and about 100 bucks for sevreal runs.