No need for regular ‘re-flash’ service
source of your vacuum, and it’s from there that vacuum gets distributed to the heater controls, the power-brake booster and anything else that requires it.
Ray: If the vacuum is sufficient there, then you’ll need to trace the route of the vacuum from the engine to the blend doors. There could be a crack or a small hole in the manifold itself, or in one of the vacuum hoses.
Tom: Or you could have a bad vacuum reservoir (which stores vacuum for use during those moments of wideopen throttle so you don’t get blasted with heat).
Ray: Some systems even use a check valve to maintain vacuum during wide-open throttle, and yours could be broken.
Tom: If there is a leak, the best way to find it is with a smoke test. There’s a machine that pumps smoke into your vacuum system so you can see where it’s escaping. That’s where your leak is.
Ray: Of course, don’t do the smoke test while driving, Luke, or you guys’ll end up with heatstroke, odor-induced delirium and smoke inhalation. Dear Tom and Ray: My local automotiverepair shop offers a service in which they will “re-flash” your car’s computer. Is that helpful, or just an unnecessary service to generate profits for the shop? Is it something I could do myself with one of those $150 scan tools from the autoparts store? The shop claims the “flashing” will remove false engine codes, increase engine performance, improve gas mileage, etc. So what do you think?
Tom: Gee, I thought that was illegal. Last time my brother flashed someone at the garage, he spent 30 days in jail.
Ray: This is not something you can do yourself with an inexpensive scan tool, Dan. The equipment required to re-flash the car’s computer costs several thousand dollars. And there are different machines for different manufacturers.
Tom: The good news is, there’s no reason to “re-flash” your computer’s memory as a maintenance service.
Ray: The primary