Update: Tested suspected MAP sensor...
VREF test: key off, disconnect MAP connector; measure voltage between VREF and SIG RTN at connector; KOEO - got 4.95v, good.
MAP/BP Sensor test: connect MAP connector; with digital multi-meter, back-probed MAP connector MAP wire with (+) and battery negative with (-) - got 2.50v, not good.
According to a table of MAP/BP voltage specs, this MAP sensor thinks it's a couple thousand feet below sea level. Maybe what the car needs is a periscope?
The frequency testing went as follows: 160Hz with no vacuum - perfect; 110Hz with full vacuum - supposed to be ~93Hz.
NOW, AFTER the above testing, is the FIRST TIME EVER getting a K.O.E.O. code 22 (MAP/BP out of self-test range), and it's been guzzling gas but not really showing signs of it besides the fuel gauge needle, and acts sluggish and hesitant upon acceleration with taking it for one spin around the block so far. I swear this car is possessed, with somewhat of a sense of humor, and likes to play games with me. Anyway, I need to find another MAP sensor... a used one that works, because new ones appear to be hovering around the the ridiculous amount of 90 bucks around here.
Checked fuel pressure today: with key just in the Run position, gauge read 38psi... it lost some pressure, because I had set it to 40psi a month or two ago...; with the engine running, the gauge said 40psi. I adjusted it up to 44psi while running.
Checked TPS idle voltage: 0.84 volts... again, a decrease. I set to 1.00 volt a month or two ago. Adjusted back up to 0.98 volts.
Doing these two things eliminated the low speed, light/normal acceleration hesitation it's been having.
Nothing else really to update. It's to be taken on an approximate 18 hour journey this weekend.
I've got all tools and will have some spare stuff on board. Wish me luck, lol
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