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Gentlemen,
Thank you all again for your recent suggestions. The car - 1990 745T automatic 202k miles - drove fine today during its first time back on public streets in a month. The road test had two legs, out and back, and featured easy country highway speeds of 45-50 m.p.h. with several stop signs along the way both legs. Engine started quickly on both legs and did not stall or even threaten to stall at any stop sign along the way on either leg. Almost an hour of park time in the shade separated the first leg from the second leg.
The idle was high on the return leg. The idle on that second half of the 15 mi. road test was about 1300 to 1400 rpm, not its normal 700 to 800 rpm. could this now occurring high idle the stemming from the idle air control valve? One of the two problems that were recently incapacitating the car was a nonfunctioning idle control valve due to, I suspect, corrosion inside the sealed idle control valve unit. That is the idle control valve that I mistakenly soaked in a submerged state in water-based engine degreaser in the summer of 2007. Then recently , when the idle control valve was found to be in a frozen state shut, the idle control valve got taken off the car, stood on end , was subjected to a heavy dose of WD 40 and left standing on end overnight. That freed the shutter up from its frozen state. This contributed to getting the car running recently. I will read the FAQ on this in any case and still have to look again at the throttle body, butterfly, throttle position sensor etc.
Something else has also presented itself. There is a gas leak while the engine is running from the hose clamp of the lowest fuel connection, as seen looking forward from the rear of the car. That is about a half-inch hose I guess. I bet that is the supply line running forward. All those hose clamps and that whole area visible through the port just to the rear of the rear seats are extremely rusty. Is there a way to clean that all up with a kit? I will also check the FAQ for this, I can see problems looming on the horizon with all that rust back there.
Thank you all.
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