91 dakota when alidding the engine is popping back throw the tail pipe.

Have you had the engine control unit scanned for fault codes? Is this oil smoke or fuel?

hark a 1991, ZJ jeep. it is.
cranks, starts and runs poorly, or stalls ? what?
your other post shows 1991. ZJ.
which engine? 4.0L inline 6? ????????????????

engine dipstick? i presume?
odd sounds?
backfire to where, air cleaner or the muffler tail pipe section?
if to Air cleaner that is gross engine timing error.
or valves, burned up or sticking. in head. no engine stated. so.. cant wax smarter.

backfire to muffler or tail pipe end, is muffler explosions, caused by too much fuel landing there
and air leaks in the exhaust path,,,, a whole other set of problems... (air = fuel = boom, there.)

"throws oil out of the dip stick" engine?
PCV valve clogged, or far worse.causes oil likes
or oil filler cap off to act odd.
also caused by gross engine failure.
do a compression test. now.

"leak detection pump" in 1991,?
not sure what pump you have in mind at all
why not post a photo of it.
with friend pointing to it


1991 has no LDP pumps. (EVAP)

you need diagnostics scanner to read the engine light for the code, this will then indicate what problem is.

its a GEO POPPER.
"no oil up on crank case"

no idea what that means.??????
yes PCV valve. do clog.

white smoke at end if tail pipe.
you didnt say where,?

white smoke has 2 reasons.(tail end)
Steam and oil.
steam goes away fast and looks just like moms tea pot. and smells sweet, like the antifreeze in engine. (rad cap off ,sniff sniff, cold engine)

oil burning, smoke is very very slow to go away.
and smells like , blush burned oil.
if not sure what burn oil looks like or smells like
take out the dip stick on a hot engine
let it drip to the hot exhaust manifold there.
now you know. and is a key diagnostic skill.


no oil seen on dip stick end?, you mean that?
well you need to keep that from happening,
doing weekly service, and for sure old cars.
26 years old.

low oil invites blowing up a good engine.
for sure.
if it did that smoke is oil
if it did 10x worse, both .

my wild guess is you meant to say
I didnt see oil leaking on top of engine.
right?

if the engine backwires to the air cleaner
you forgot to replace the cam belt every 60k miles
the pcv will also be clogged, on cars not getting proper service, super colon.
if the PCV clogs,engine may leak oil bad.

this engine btw is a G10 3 cylinder.
with TBI injection.
we can talk TBI all day, owned one.

white smoke can come from many places
exhaust manifold, leaks of oil can land there
engine can back fire to air cleaner making smoke.
tail end.
steam is much worse. ill not delve in to that yet/.

CHECK FUEL PUMP

Try running fuel injector cleaner through the gas tank. A fuel injector might be stuck open, letting lots of fuel into the engine. Also try replacing your fuel pressure regulator, and inspect the fuel tank return lines.
Good luck
Matt

Hello;Are there any service lights on in dash?It could be that the fuel pressure valve went bad,causing it to get to much fuel, and thats were the black smoke is coming from.

i do believe it is on the front LH side of engine,i think it is in '91. I can't remember what year they moved it.Just follow you centre wire on distributor cap back to it.

2 things come to mind.. Fuel pressure regulator.. and Leaking injectors..