Poor idle after changing valve cover gaskets.
#1
Poor idle after changing valve cover gaskets.
As title says, i changed both valve cover gaskets and its idling horribly....when cold it idles ok around 1200-1000 but feels like it misses or stutters....when warmed up its way worse, hunting between 750 and 300 rpms, shakking badly etc...i double checked everything for intake leaks etc...even sprayed some either around UIM gasket to check for leaks....im wondering if its IACV finally crapped on me.
I should add that when driven the car drives beautifully and leaks not a drop of oil anymore...., however when i clutch it to come to a stop it idles almost to 0 before catching itself and even dies sometimes if i dont tap the gas....
plz help, thank you!!
EDIT* new UIM-LIM gasket installed when it was off too...
I should add that when driven the car drives beautifully and leaks not a drop of oil anymore...., however when i clutch it to come to a stop it idles almost to 0 before catching itself and even dies sometimes if i dont tap the gas....
plz help, thank you!!
EDIT* new UIM-LIM gasket installed when it was off too...
#4
Im guessing IACV if it is only the idle that is ****ty, but when you give it gas is ok. All your vacuum hoses connected good? Take your IACV off clean it, and test that all connectors on IACV are functioning. Changed both of my valve cover gaskets, spark pluk gaskets(one was leaking oil) a couple years ago, but did not have issues like you so
Last edited by vilmaxima; 04-03-2012 at 03:10 PM.
#5
He did not raise idle, but did spray wd-40 over the UIM gasket(in his post)
Im guessing IACV if it is only the idle that is ****ty, but when you give it gas is ok. All your vacuum hoses connected good? Take your IACV off clean it, and test that all connectors on IACV are functioning. Changed both of my valve cover gaskets, spark pluk gaskets(one was leaking oil) a couple years ago, but did not have issues like you so
Im guessing IACV if it is only the idle that is ****ty, but when you give it gas is ok. All your vacuum hoses connected good? Take your IACV off clean it, and test that all connectors on IACV are functioning. Changed both of my valve cover gaskets, spark pluk gaskets(one was leaking oil) a couple years ago, but did not have issues like you so
#7
My VERY first thought and worry.....but i would think if it was a harness issue it wouldnt only b on idle....it would affect the car w load on and off the engine and at all rpms.....also btw no codes
#8
Not if its the IACV because it only takes over at idle, part of the ECU that controls the IACV can fry as well.When I had a screwy idle I first checked for leaks and such and found none. THen I got an IACV code and was relieved becuase I thought I would go to the pull-a-part, swap it out and be done. Didnt fix it. Come to find out the ECU can fry and you need to repair or for most people, replace it. Test the IACV. Should be 30ohms resistance. Then trace the wiring. First check for leaks though, hoses can have a crack
#9
Exactly as u stated, unless the wires only affect idle. Maybe a wire that is hitting ground sometime(small split), give it a good visual check. Everywhere. Also when did you clean or replace your air filter, fuel filter, or spark plugs? What I forgot, how is your main ground wire? Or do u have a grounding kit?
Last edited by vilmaxima; 04-03-2012 at 04:18 PM.
#10
Exactly as u stated, unless the wires only affect idle. Maybe a wire that is hitting ground sometime(small split), give it a good visual check. Everywhere. Also when did you clean or replace your air filter, fuel filter, or spark plugs? What I forgot, how is your main ground wire? Or do u have a grounding kit?
#13
#14
#15
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IACV will not cause a rough idle (misfire). It only controls idle speed.
If the valve fails to function and is closed the idle speed will default to the throttle body setting, which should be about 550. If it fails open you'll have a very high idle.
The valve only controls air flow which in turn sets idle speed.
If the valve fails to function and is closed the idle speed will default to the throttle body setting, which should be about 550. If it fails open you'll have a very high idle.
The valve only controls air flow which in turn sets idle speed.
#19
Check all your hoses, they get brittle and crack really easily. I replaced my valve cover gaskets a few months ago and had to get 3 new hoses because they broke or cracked badly. There are a lot of little hoses connected to the UIM and throttle body. When you took both off did you number each hose and connecter and what it attaches too? Thats what I did and putting everything back together was a breeze. If you didn't, visit one of your friends who has a same year maxima as yours and compare everything in your car to his to make sure you put everything back together properly. My guess is you forgot to plug a hose back in or plugged one of the hoses into the wrong spot, seeing as how this started after you put everything back together.
#20
Check all your hoses, they get brittle and crack really easily. I replaced my valve cover gaskets a few months ago and had to get 3 new hoses because they broke or cracked badly. There are a lot of little hoses connected to the UIM and throttle body. When you took both off did you number each hose and connecter and what it attaches too? Thats what I did and putting everything back together was a breeze. If you didn't, visit one of your friends who has a same year maxima as yours and compare everything in your car to his to make sure you put everything back together properly. My guess is you forgot to plug a hose back in or plugged one of the hoses into the wrong spot, seeing as how this started after you put everything back together.
#23
ok so i went over this again today checking and replacing more hoses as i went....and i found the issue. It was the egr valve gasket, for some reason it had slipped off the far bolt and was hanging by the front bolt (bolt you can see)....so i got it on there right, put it all back together and what do you kno.....car runs like it should.
I appreciate all the help you all give we with this car...i am limited on knowledge but willing to try and learn whatever! thanks again!!
I appreciate all the help you all give we with this car...i am limited on knowledge but willing to try and learn whatever! thanks again!!
#24
glad you found the problem . I was going to post basically that. when I did my valve covers years ago . I left the EGR tube bolts loose and had exactly that problem . tightened them up and idled perfect after that
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