vacuum problems -
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post #1 of 3 Old 01-26-2010, 03:48 PM Thread Starter
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Location: Alfred
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vacuum problems

having a wierd issue with the 2.5l engine. We had to swap another 4cyl in it cause we blew the other well we weren' that smart and didn't mark anything. We have it pretty close but it idles rough. When i unhook the ccv valve line it'll idle up and idle normal. Shouldn't this be the opposite? anybody have any ideas of what could be going on?

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post #2 of 3 Old 01-26-2010, 04:37 PM
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1989 YJ Wrangler 
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Location: clinton twp mi
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That is weird, do you mean the pcv valve? If so, reinsert the pcv valve and remove the oil filler cap. does it smooth out? Is the pcv valve good? this will at least tell you if its becaause of the pcv valve or the crank case presure.

I recently swapped motors in mine with one that sat for some time and the rings were stuck from sitting. So I remoived the plugs and shot some tranny fluid down into the cylinders and let it soak for a while .5 hour. then ran it some more. Let it heat up and then let it sit. after a while they free'd up and it ran smooth. I dont know if this is your problem, just something to concider.
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post #3 of 3 Old 01-26-2010, 06:56 PM Thread Starter
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no i guess in 91 they started calling it the ccv valve. wierd.
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