Having problems with your Jeep CJ5 ?

My 78 Jeep CJ5 Runs badly once it warms up - CJ5 Jeep Cars & Trucks

Posted / edited by AnonymousUser on : 25-05-2020

Answers :

The systems that run that engine are relatively simple and straightforward.
Your carburetor is adjustable, using a vacuum gauge and simply turning the air screw in and out till you get the highest reading without causing any shaking or missing. (sometimes helpful to remove the screw and spray carb cleaner into the hole before starting this. turn screw back all the way in till it just bottoms, then back off about 2 1/2 turns for starting point.Make sure the choke is opening all the way when its warmed up and make sure that no gasoline is seen dripping inside the inlet while it's running. Use carb cleaner to locate any vacuum leaks at manifold to head gasket. If rpm changes when sprayed, change that gasket.
Check your engine timing. Check the distributor shaft for side play that will change dwell angle and cause missing. Make sure points, cap rotor wires and coil are good. Make sure the points are properly adjusted and not burned.
Especially on an older engine, it's important to do a compression test to make sure that all cylinders are within 20% of each other. A blown head gasket, sticking or worn rings will definitely cause poor running. Most homeowners don't have a cylinder leakdown meter. Having that test done is also a good idea when faced with a potential internal problem.
"reading" spark plugs is also a good idea when tracing problems, especially in older engines where a computer is not compensating for and "covering up" anything. Plugs should be light tan after a few days of running. Black or excessively white porcelain around the electrode tells you a lot about what is going on inside the combustion chamber and will tell you which cylinders to look at. Pulling wires off each plug one at a time can also give you a good read on which cylinders are not correctly firing.
You didn't give any specifics as to what you have already tested, so, check everything I mentioned.
Good luck

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