Reply 19120 of 27819, by creepingnet
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chrismeyer6 wrote on 2021-06-03, 23:18:creepingnet wrote on 2021-06-03, 23:02:It's Retro Truck day for me. Got to figure out the low-rough idle on my 1993 Ford Explorer. How does this fit into "retro computing" you ask? Well, I've read a few places mentioning Explorer/Ranger PCM's having leaky caps....so funny my first full recap might be on the engine computer for a Ford. Got some other things to check first (vacuum leak-ish stuff).
I'd pull the IAC and give it a good cleaning with some brake cleaner. They usually get gummed up with carbon and the valves stick and cause All sorts of idle quality issues.
Yep, that's first order on the menu, clean/check MAF, IAC, and check on a vacuum line that goes fro the intake/throttle body that often gets holes on these 4.0L V6 engines, and inspect all my other vacuum lines,and check the PCV since a tune-up is due soon anyway. Pretty much all that stuff is original except the PCV valve (I've been with this vehicle since I was 10 and it was new in 93').
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