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Unread 11-15-2002, 11:07 AM   #1
DIXIE
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missing when in action... Please help my 258

This week I have been trying to get my 258 I-6 running right. I have changed a few parts and done some minor tune up work on it. I still have a bad miss only when the engine is under a load. It runs fine at all rpms when just sitting in the garage, but as soon as you get it out on the road and put the load of moving the engine cust out real bad. Any ideas on where my problem is?

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Unread 11-15-2002, 11:48 AM   #2
bowhunter
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Dixie

Have read some of your other post also. sounds like this problem has been going on for a little while. It may be carb related.
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Unread 11-15-2002, 11:54 AM   #3
DIXIE
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It has a new carb on it... I am running out of things to check. I am going to try to drain the gas out of it and get new gas to put in it. The gas that is in it has been in there for a while. I didn't have my top when it started getting cold here so it didn't get driven for a while...
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Unread 11-15-2002, 06:28 PM   #4
cj5mudman4x4
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Dixie,

I had the same problem with my 73' Cj5, 258 I6, hate to tell u but I had to take my head off so i could boil it out. It was nasty. but have u done anything like that? if u havent had it apart enough to check the pistons u might wanna see if there is any play in ur pistons. Also u might wanna do a compression check. they make little doodads that check ur compression through ur spark plugs. u might wanna give that a go! i boiled my head out and it cleared up for me. also check ur PCV valves for clogging-- wont cause it to miss that bad, but still.

good luck
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Unread 11-15-2002, 06:35 PM   #5
DIXIE
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Thanks mudman... I might give that a try this weekend. Did yours just start all of the sudden. Mine started in the middle of driving it. Before it ran fine at high (above idle) rpms.
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Unread 11-15-2002, 06:38 PM   #6
cj5mudman4x4
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Mine would miss about into 3rd gear. i dunno.. i didnt say before, but mine fixed for about 6 months. It is barely and rarely missing again when it isnt warmed up. I am scared i might have to overhaul the Engine
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Unread 11-15-2002, 06:41 PM   #7
DIXIE
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I am sick of taking it to my mechanic... it doesn't seem like he really does anything for it. That is why I decided to try it myself this time. I have just about run out of things to check before I have to tear into the engine.
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Unread 11-15-2002, 08:13 PM   #8
SamFromCO
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Here's one more thing for you to check. Fuel filter.
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Unread 11-15-2002, 10:50 PM   #9
goody350s
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just wondering what your new carb is
is it a carter bbd? i have seen other posts
about enlarging a tube inside the carb itself
they say that has somthing to do with it
missing try doing a search in the forum
about this subject
i dont know but maybe that would help
anyway just my .02
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Unread 11-16-2002, 12:09 AM   #10
DIXIE
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Quote:
Originally posted by goody350s
just wondering what your new carb is
is it a carter bbd? i have seen other posts
about enlarging a tube inside the carb itself
they say that has somthing to do with it
missing try doing a search in the forum
about this subject
i dont know but maybe that would help
anyway just my .02
I have already drilled out the idle tubes on my carb. Thanks for the info though.
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Unread 11-20-2002, 07:44 PM   #11
jeepin cj-5
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I have a 73 cj5 also and it souds lik i may have te same problem. How did u boil it out.. and what does boiling it out do?
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Unread 11-20-2002, 09:31 PM   #12
cj5mudman4x4
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to tell u the truth i don't know why i said boiled out. i was not all there when i posted that.. what i meant was, i had a valve job done and i had my head TRUED UP, not boiled. it was warped which is common. so look for that. and if u get it all apart check ur pistons.. i found out that i am gonna have to bore out my engine so i am sad, but anyways.. good luck
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Unread 11-21-2002, 04:53 PM   #13
jeepin cj-5
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ok things make sense now... Yeah i have been thinking that i might need a valve job... I biggest problem is that it burns oil like its gas. Not sure exactly what that means.. must be the seals
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Unread 11-22-2002, 01:42 AM   #14
Jeep Daddy
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Do a compression check and post that information. If the compression is good, get a new carb. I know you said you already put a new carb on it, but that is impossible since you can't get a new carb and some rebuilders do not have great rebuilds. There are a few rebuilders that CAN do BBD's. Some can't. Or, get an aftermarket Weber or a MC2100. You might want to take it to a mechanic to scope it. Scoping it will tell you if your spark is good to ALL cylinders. It won't tell you if you have low compression or need a valve job.
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