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Old 11-19-2010, 09:16 AM   #1
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Major ticking in engine

Hi all -

I have a major ticking going on in the engine. I know I am running too lean, as I don't have much power and the Jeep runs MUCH better when the choke is 1/3 engaged.

But what really is bothering me is the loud ticking (even when oil is topped off) when I run the engine, usually around 2000-2300 rpm. It presents itself much more when I am cruising at that rpm and the engine is not under duress (i.e. I am not accelerating).

What am I looking at here?

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Old 11-19-2010, 09:23 AM   #2
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Not an expert on the subject but will tell you what I know. First of all fix your lean condition. Running lean can cause your engine to knock/ping. When under load, you are throwing more fuel into cylinder which might be enough for it to stop pinging/knocking. See if that helps.

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Old 11-19-2010, 09:44 AM   #3
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you must be talking about your 1990 yj since you stated you have a choke. i relly hate the carbs they put on those. didnt they have some short of a stepper valve that can cause a lean condition when the stop working and get stuck? all i know is when any of my small engines with carbs only run right with the choke partial on its always a clog in the main get. so if you have enuff fuel pressure then its a restriction of fuel somewhere in the carb. i had a 86 cj that i swopped the carb on with one from a 2 barrlell from a ford truck with a 302 v8. i had to fab an adaptor but it wasnt hard, it ran so much better from idle to full throttle.

as for the ticking it concerns me that it seems to be loud at the mid rpm. if it was lifter you would think it would be louder at lowwer rpp and quiet when the oil pressure goes up with throttle increase. try replacing one quart of oil with marvel mistery oil and run it for 500 miles then see if it goes away. then change the oil. also add it to the gas tank . ru you sure its a lifter/valve tick and not a piston pin or rod?.
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Old 11-19-2010, 10:20 AM   #4
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my 89 just did the same thing it ur timing chan and the spring that makes it tight is worn out
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Old 11-19-2010, 10:34 AM   #5
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I should have also noted that I have a MC2100 carb in there. I can't say for sure what the tick is, that's just it. I don't want to assume lifter/valve tick. I will say, too, that I have not replaced the fuel filter yet. Also, there is a weird circular metal thing down near the distributor that the fuel goes through. Right before it gets into the metal circular thing, it goes through a ridiculously short piece of rubber hose that takes a HORRENDOUS 90 degree angle from vertical to horiztonal. That hose contricts the flow of fuel (I would assume by looking at it). Even if I replace that piece of hose, the bend is still going to be there. If I make the hose do a loop instead of a bend, maybe that would be a better fix?
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Old 11-19-2010, 10:41 AM   #6
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Your Jeep exhibited the same symptoms that I explained?

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