Quoted: Has anyone used a fuel treatment that you dispense via the schader valve under the hood?
I have a 99 Camaro that now is hard to start and emits black smoke when first started. I checked the fuel presure and it drops off after several mins.
I want a good cleaning of the injectors before I go all out and replace them.
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Sure, they are the best way to clean injectors. In tank solutions are better than nothing but many of them end up doing very little.
I have the BG fuel injection setup at the shop. It consists of a guage, manifold w/reservoir, pressure regulator, atomizer, and some adapter fittings.
Basically there are two ways to do it. Vehicles with Schrader valves it goes through the valve. Vehicles without Schrader valves get hooked into through the fuel rail using the adapters, it's a more difficult setup on some cars, but works the same as the Schrader method.
The tool is well designed for this job, it is pressurized and uses a special solution to clean injector nozzles and valves. Then a solution is added to the tank. That system cleans the injectors better than anything I've seen.
We can also 'Atomize' the throttle body/intake manifold as an 'Induction De-Carb' service. This removes the hard carbon buildup that settles in your intake runners and throttle body. It also cleans the valves.
I wouldn't recommend doing this more than once every 12-18 months, depending on mileage and driving conditions. The ultimate would be a de-carb and a fuel injection service, but ask your shop if they have the right equipment for the job. You don't want some fool spraying carbuerator cleaner into your throttle body and charging you $150 for a full injector cleaning and de-carb service.