urdrwho Posted June 21, 2013 Share Posted June 21, 2013 I removed the PCV hose to use as a place to take vacuum readings. I noticed that there was a slight (very slight) lessening of the shaky idle. Took the readings and thought....let us go for a ride. It may be in my mind but while sitting still with the AC on the engine isn't shaking as much as it has been. Plus it seems that take off and driving in general is better. Could it be? I need to have my wife drive it. Maybe I am imagining things. Crankcase pressure venting to the air and possible better running....what could that mean? Forgot to add but the PCV was replaced a few weeks ago. Link to comment Share on other sites More sharing options...
r3v_v3ng3 Posted June 21, 2013 Share Posted June 21, 2013 Might mean that your pcv needs replacing from being bad/old. Link to comment Share on other sites More sharing options...
urdrwho Posted June 21, 2013 Author Share Posted June 21, 2013 Oops, I forgot to add that the PCV was replaced a few weeks ago. Maybe I'll edit my original. Might mean that your pcv needs replacing from being bad/old. Link to comment Share on other sites More sharing options...
Sludgeroo Posted June 21, 2013 Share Posted June 21, 2013 If the pcv valve is bad you can create enough pressure to get "blow by" although this really only happens on forced induction applications. That can make a shakey idle, and If it was relieved with it removed , to me it indicates that its bad. The plunger that moves in and out should be able to wiggle and bounce freely as the littlest bit of vacuum is used to open it. Soak it in carb cleaner or gasoline. Or purchase a new one. Personally I deleted my pcv and just ran it to a catch can to collect oil vapors. Hope this works for ya. Link to comment Share on other sites More sharing options...
Sludgeroo Posted June 21, 2013 Share Posted June 21, 2013 Clogged hose? Link to comment Share on other sites More sharing options...
urdrwho Posted June 21, 2013 Author Share Posted June 21, 2013 I used the hose to take vacuum and it seemed clear. Clogged hose? Link to comment Share on other sites More sharing options...
Sludgeroo Posted June 21, 2013 Share Posted June 21, 2013 Hmm... that was all you did was just take a reading? Link to comment Share on other sites More sharing options...
urdrwho Posted June 21, 2013 Author Share Posted June 21, 2013 Yes that was all I did. Hmm... that was all you did was just take a reading? Link to comment Share on other sites More sharing options...
Sludgeroo Posted June 21, 2013 Share Posted June 21, 2013 Interesting, I am honestly stumped. It makes sense why, but the symptoms don't match for it to be the explanation. Try to run it with the hose off and then without the vac gauge? It should still idle and just put your finger over the hose a bunch and see if the idle changes... Link to comment Share on other sites More sharing options...
urdrwho Posted June 22, 2013 Author Share Posted June 22, 2013 I took the rake boost hose off to try there, it was first start of the morning so idle was high. The needle bounced between 20 and 20.5. That is not perfect but neither does it show anything like a valve problem. I also tried a smoke test. I didn't have access to a cigar but did borrow a cigarette from a friend. I didn't see any smoke leaking. [ame=http://www.youtube.com/watch?v=zMok2y05jNE]Finding Engine Vacuum Leaks With A Cigar - YouTube[/ame] I quit smoking in the mid 1970's, placing a cigarette in my mouth was still, after all these years a temptation. After doing the test any temptation was gone....yuck is all I can say. A few things to do yet and that is check the timing marks andswap out injectors. There is a guy on a list that has offered to sell me 4 good ones for $65 plus $8 shipping. They have new filters, O rings and flow tested (test sheet included). Interesting, I am honestly stumped. It makes sense why, but the symptoms don't match for it to be the explanation. Try to run it with the hose off and then without the vac gauge? It should still idle and just put your finger over the hose a bunch and see if the idle changes... Link to comment Share on other sites More sharing options...
spooln30 Posted June 23, 2013 Share Posted June 23, 2013 What year/engine do you have? I've seen on the 2.5 dohc where the hose goes onto the valve covers being clogged from a sludge engine. Also there maybe another part that isn't working check and test your egr valve. Link to comment Share on other sites More sharing options...
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