1986 jeep cj7 4 cylinder engine timing

PCV bad. (or its hose pinched, clogged or even backward)

1. PCV is failing fix this first for $5 or remove it and see how bad blow by is. visually. (remove only valve covers side to test )
2. or cracked or collapsed piston.
3. or cracked head gasket, compression tests pass?

yes one of the best jeeps are YJ, not full 10 stinking married computers , wish every day I never sold my 2002,
2002 is the last good jeep IMO

blow by is most mostly past bad piston rings, even warped cylinder from past overheated engine,

The YJ used a 2.5 L AMC 150 I4 or optional 4.2 L AMC 258 I6 until 1990

which one, 4 or 6 cylinders.???

YJ jeep Jurassic Park

1992 Jeep Wrangler YJ Sahara models
all are great.

a blast from the past... 1986 jeep , with no name, 1 of 7models....
ill roll the dice for yah. J10 jeep, 4.2L
i think NGK covers that, did you look i there free on line eCAtalog.
0.035"

as seen here.
http://www.partcat.com/ngk

id look it up in mitchells but no car stated,
CJ7 and Grandwagoneer show same,
35 THOU

The timing has to be set right between the cam the crankshaft and the rotor during assembly, sounds like the cam or crank is off.

old post and is key question on old jeeps
no engine stated. guess 4L
the ASD began 1990 to present.
the ANSWER IS BELOW.
the car did not have and ASD until your car was 100% Chrysler EFI. The goofy French EFI has none .
ASD and the 3 second rules and 6 to 8 failure classes to trip it.
none. some jeeps changed in 1993,

• 1986 - Renix TBI available on Jeep 2.5 L four-cylinder engines.
• 1987 - the new Renix controlled 4.0 L six-cylinder engine was rated at 173 hp (129 kW; 175 PS) and 220 lb·ft (298 N·m) of torque.
• 1988 - 4.0 L output increased to 177 hp (132 kW; 179 PS) and 224 lb·ft (304 N·m) of torque, due to higher compression ratio. Renix still TBI
• 1989 - Changed to Renix MPFI. (4 injectors now)
• 1991 - Chrysler Corporation (then the owners of the Jeep brand replaced the Renix control system with OBD-I-compliant control electronics, the Chrysler HO EFI) with check engine light.(and flash codes)

Jeep 4.0

depends on elvation but about 8 deg adv.

You have a "locked" distributor. There is no adjustment. All timing "decisions" are made by the computer after reading the info from the sensors on the engine. Ones that influence timing most are the throttle position sensor and Manifold air pressure (MAP) sensor, though all play a part.

Follow the line from the clutch master to the slave. Its within a 3 foot distance.

Heat is pretty much methanol...it will counteract the effects of the other additive you used. Run that stuff out of there and try using 3oz of acetone per 10 gals of fuel and possibly adding a couple of degrees more advance to the timing. If you know anyone with a gas analyzer, perhaps they can help you get it set up.

HAVE YOU REPLACED THAT PLUG AND PLUG WIRE,FIND NO3 CYLINDER AND PULL THAT WIRE OFF SEE IF ILDE OF ENGINE CHANGES IF NO THEN YOU MAY HAVE BIGGER PROBLEM BUT DEFINITELY CHECK FOR SPARK WITH WIRE ON PLUG ITSELF.