tan@wxlvax.UUCP (Jack Tan) (07/27/84)
I have a 76 Toyota Corona wagon with automatic transmission and 20R, 2.2 L, engine that I bought last November. When I had just got it, it idled very fast in N or P. But if I shifted it to Drive, the idle speed felt normal. The carb was replaced a year ago before I bought. I adjusted to spec which is 800 rpm in P or N. However, this adjustment made it idle at very low rpm and it was unstable in Drive. After driving it for half a year, I experienced stalling during normal cruise or idle in Drive. At that time , I found the gas filter clogged. After replacing the gas filter, it ran fine for a while. Then the stall during idle problem came back. I checked timing, dwell, and fuel filter, and adjusted the carb again. No help. A garage checked it "with computer" and said the carb should be replaced. Since the carb is quite new, I hate to waste it. My guess is that I might have contaminated the carb while changing the fuel filter. The idle fuel supply may have dirt in it. The fuel pump is electric and works fine. My questions are: why the idle rpm drops a lot when shift from Park to Drive? And what in a carb can be damaged or worn by dirty fuel? Can I avoid replacing carb by rebuilding? Or can I avoid taking the whole carb apart to rebuild by just cleaning some fuel passages? All suggestions are appriciated. Jack Tan decvax!ittvax!wxlvax!tan