If your TB rebuild included replacing all the injector seals then I'd venture to guess you have a vacuum leak somewhere, if you haven't changed the injector seals I'd check those first, top and bottom. Having been 6 months you've probably already solved this one, but I figgured someone else might run into this issue.


20k since I put the Monty together and its still running reliably on a 205k original short block, though I still had detonation issues on warm days even with the IC. Turns out the fuel map leans out between 10 in/hg. and 0 pressure. It wasn't consistant nor a real serious problem, but at times it was enough to trip the knock sensor and kill the timing curve. My solution was to run a mass airflow sensor out of a first generation Eclipse GSX or GST. They're calibrated a bit differently and cause the Starion ECU to run a bit more on the rich side. I've found the difference to be a loss of about 1.5 mpg, bringing my average mpg down to 15.5.

I never really liked the idea of mounting the IC down behind a vented skid plate, it didn't seem like a location with very good air flow. I had removed my A/C condensor since I turned the A/C compressor into an air compressor, so I inverted the starion's IC and mounted it where the condensor used to be. With that location and using a flex fan the IC sees more than enough air flow to keep things cool with no heat soak from the radiator.