258

Year 258 (CCLVIII) was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Tuscus and Bassus (or, less frequently, year 1011 Ab urbe condita). The denomination 258 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

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    Engine 258 Tuning troubles

    Started up my rebuilt 258 (1978 CJ5) and can't get it below 1500 rpm @3 deg timing. Idle stop screw is all the way out, vacuum disconnected. If I set the rpm to 850, the timing is 10+ deg, and I can't give it any gas without stalling. At that idle, it also continues to run for a bit after...
  2. J

    Misc. 1984 CJ7 Running Rich

    Hi. I have a 1984 a CJ7 with a AMC 258. I’m having an issue with a rough idle, a miss, and it’s running rich. It failed smog in California. I have replaced all basic tune up parts, coil, ICM, and a carb I bought from Amazon. It will run fine (slight miss) when it’s cold. As soon as the engine...
  3. T

    Electrical 79 CJ5 258 no spark

    I have a 79 CJ5 258 that the engine would not shut off when the key was put in the off position. It was sporadic and didn’t happen every time it was run. I replaced the key ignition cylinder, ignition module, coil, plug wires. I bought a new distributor, but don’t want to replace if it’s not...
  4. T

    Electrical 79-CJ5 258 ignition- no spark

    I have a 79 CJ5 with a 258. Have an ignition issue I can’t resolve. Jeep would continue to run when the key was turned off. I replaced the ignition key cylinder, module and coil. Still don’t get spark. Bought a new distributor, but before I replace that. Does anyone have any thoughts if...
  5. 2

    Engine 258 7/16 or 1/2 head bolts by wrench size

    I'm looking for a 1/2 head bolt 258 block. Is there any definitive way to tell without pulling a bolt? Is the wrench size (not thread size) different on the head bolts. I know a 7/16 should be 11/16" or 5/8" and 1/2 should be 3/4 in the rest of the bolt world. I'm just looking for a quick...
  6. C

    Misc. 258 Weber fuel pressure regulator return plumbing?

    Hi, I learned enough just looking around on this forum that I wanted to sign up and learn more. My only engine experience is read, research, and attempt. I'm going to try a Weber pressure regulator to determine if it will help my Weber 38 to start up again. This regulator has its own return...
  7. C

    Engine 258 breather hose filter needed - Picture and possible part #?

    Hello, I've been searching all over the web for this little filter (sits inside the make up air hose) that keeps dirt from entering the valve cover and can't it. Here's a picture and a possible Jeep part #: 1 318 2487 I couldn't find it on google or anything.
  8. B

    Engine 258 w/ cracked block... What Now?

    I have a 78 CJ5 258 with a t-18 trans. I was getting ready to change out the exhaust manifold and discovered, under the manifold on the side of the engine block, a crack running from freeze plug to freeze plug. I have had this jeep for 4 years and put a ton into it. I couldn't figure out how I...
  9. J

    Engine Troubles with my 86 CJ7 258 bottom end with a 4.0 top

    I picked up a 86 CJ7 over 8 years ago. The top end was swapped out with a 4.0l from a 96 Cherokee. When I got it ran find but it needed a new clutch and the transmission plus transfer case got an overhaul. The transfer case had JB weld and if you can believe it… expanding foam😳. Besides the...
  10. G

    Engine 85 CJ7, 258, Carb replacement

    New to me 85 CJ7 258 I6. Don't know much about the history. Seems like everything on it has been modified or messed with in some fashion. Couldn't get it to idle without having the choke all the way out, even then it was rough. After looking at it I realized most of the vacuum lines had been...
  11. T

    Engine Oil

    Oil recommendations for 1986 258 with 48k original miles?
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