Vacume line leak
Which engine? lots of engines on 86, lots swapped too.
to work on any car engine wise this is first, ID the engine.
then the Fuel system. carb or EFI.?
lean fuel mix can be caused by.
well gee what engine, and is it EFI, nah , not in 86 its a carb.
if a carb you really need to say so as many a mech never seen one.
today. gone now for 27 years. 87 to present.
i cut teeth on carbs. in 60s
a love/ hate thing,,, today i have fancy tools, that mean them easy.
my comments are USA only , as export jeeps are vastly diffr.
I had a 88 (2 of them same time) then a 99, then a 2002 then 2008
1/2 million miles on them or more.
vacuum lines are easy, replace em or inspect test them.
if they look cracked they are roll them between fingers.
or use a hand vacuum tool attached and do a leak down test on all .
or pinch them running to see if RPM changes radically.
ill answer for CARBS (in order of likely)
2.5L: 4.00-5.00 psi (27-34 kPa) at idle 2.8L: 6.00-7.50 psi (41-51 kPa) at idle
that is fuel pressure, Rochester or carter carbs. carb have many ways to go lean, all the time, idle, cruise, accel. , or wideopen throttle (hot engine) so the first is to discover that. if idle is lean adust the idle mix screw. if that frails it clogged or you have gross vaccum leaks.
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SOURCE: 1997 jeep cherokee, check engine light on,
o2 sensor: or you have stopped up injectors or a vaccum leak or egr valve sticking
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