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Jeep
CJ7
Repair Questions and Answers
Question: 1986 Jeep CJ-7 mileage:
193,000. My problem is this, my jeep stopped running and
I don't have a lot of cash to spend on fixing it right
now. I'm thinking that there is something wrong with the
wiring. The motor turns but it will not start (fire). I
replaced the coil because it was not sparking and
checked all the wires for flow of current and compared
the pathways to a Haynes manual wiring diagram.
Everything looks like it should work but it doesn't. I
have never messed with the timing but I am beginning to
think that may be the problem.
Answer: Check to see if the timing
belt has failed. If you are unable to observe the
camshaft while cranking the engine, a compression check
will tell you if there is a problem.
Question:
1984 CJ-7 Jeep mileage: 225,000 I am losing brake
assist, when the engine is running. Can you tell me what
the procedure for checking the brake booster for vacuum
leaks is?
Answer:
First as you press the brake pedal, you should not hear
a hissing sound. Second test, with the engine off,
pump the brake pedal several times and then hold your
foot on the brake with constant pressure. Leaving
your foot on the brake, start the engine. Your
should feel the brake pedal pull down slightly
indicating that the power brake booster is working
properly.
Question:
1986 Jeep CJ-7 mileage: 203,000. My jeep stalls
and backfires whenever I drive in rain or very humid
weather. I rebuilt the carburetor and
changed my distributor, cap, spark plugs and cables.
My mechanic and I are out of ideas.
Answer:
Check the ignition coil as the top tower may be shorting
out.
Question: 1985 Jeep
CJ-7 mileage: 98,000. Engine runs fine except
it blows out oil at highway speeds (60-70 mph).
Engine does not smoke and cylinder compression checks
110-130, spark plugs show normal color.
Answer: Check engine
breathers and PCV valve for proper operation.
Question:
1982 Jeep CJ-7 mileage: 165,000. I can't get
my Jeep to start. I turn the ignition key, and I get
nothing, except a click somewhere in the engine
compartment. I replaced the following items
(battery, starter, solenoid, and negative battery cable)
and cleaned all contacts and grounds. The dash
gauges seem to peg to the right as if the system was
discharging when the ignition key was turned.
I have strong headlights, and the Jeep had started
several times over the past two months. The Jeep
has been sitting most of the winter (waiting for my son
to come home on leave), but I have been running it now
and again to keep the battery charged. When I went
out a couple of days ago it was dead. Any
suggestions?
Answer: Here are some things to check.
Load test the battery. Check that the battery
cable connections are clean. Check for 12 volts to
starter solenoid with the key in the start position.
These things should be checked first then the ignition
switch, neutral safety switch, starter and starter
solenoid. One of these may be faulty.
Additionally, here is the procedure we use to isolate a
battery drain. Remove negative battery cable from
the battery. Using a 12-volt test light, hook one
end to the negative battery post the other end to the
negative battery cable you just disconnected. The
test light will glow or “light” if there is a drain.
If the “light or glow” is faint, that is probably normal
draw for the clock or computer. If the “light or
glow” is bright, then there is a large drain. That
should be corrected. Now start removing and
replacing the fuses one by one until the light goes out;
that one will be the circuit with the drain.
Remember to hold in the button in the door jam for the
interior lights.
Question:
1985 Jeep CJ-7 mileage: 225,000 My engine is
blowing oil out around the distributor shaft, oil dip
stick, oil pan, and up into the air filter. A
compression check shows approximately 160 PSI, dry to
175 PSI wet. All vacuum lines intact and pulling
approximately 20" HG including through the PCV valve.
Would this be a piston and ring problem or just the head
(valve seals) or something else?
Answer: You may have piston ring problems.
The PCV valve can only handle so much blow by, the
excess will result in the problem you are experiencing.
Try a cylinder leak down test to check the rings for
blow by.
Question: 1986 Jeep CJ-7 mileage: 198,000. I have an opportunity to buy a 258 in-line 6 cyl for the same year jeep (80). I currently have a 4 cyl 151. Is there a problem with using the 151 engines 4 speed transmission? It was rebuilt and I would like to use it.
Answer: Your transmission will not work with a 6 cylinder engine.
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