my aac is super clean!.. but,

[darkslide]

so I've had this idle issue for a while so i decided to take off the aac to clean it out. while it was off i tested the solenoid and circuit to make sure it was working, everything was all good. put it back together and turned it on to find the idle was still stumbling. I've checked other stuff before i decided to clean the aac such as; tps, ect, maf, ecu, timing, o2, and fuel injectors, it all checked out good.. soo does anyone have any ideas of what could cause this?

[cotbu]

You need to describe the stumble or post a video....Based on the latter part of the message I would say coolant temp sensor, but you said stumble????? so I'd say vacuum test. Thinking the whole time it's timing!

What is your idle rpm? let's say 950rpm... Does it drop from 950 to say 600rpm then try to idle at 950 then back down? Or does it idle at 950rpm then up to 1200rpm back down then backup?

This where a Video/w Audio comes in.

[Anto]

IACV?
Maybe?

[darkslide]

You need to describe the stumble or post a video....Based on the latter part of the message I would say coolant temp sensor, but you said stumble????? so I'd say vacuum test. Thinking the whole time it's timing!

What is your idle rpm? let's say 950rpm... Does it drop from 950 to say 600rpm then try to idle at 950 then back down? Or does it idle at 950rpm then up to 1200rpm back down then backup?

This where a Video/w Audio comes in.

its about 950-200 :cool: haha and also when im coming to stops it decides to die, but yeah i was gonna post a video but my gf's brother has my camera somewhere =/

IACV?
Maybe?
do you mean the iacv-air regulator?

[darkslide]

found my camera!! okay some ideas?? on the first video its a cold start the idle isn't where it should be i rev'd it and it dipped down after letting go of the throttle

http://www.youtube.com/watch?v=G5WW7d075H0

the second video you can tell its running way to rich and notice how shaky it is

http://www.youtube.com/watch?v=mJBVRaNvSqk

i was gonna take another video of me driving so you can hear some kinda backfire sound coming from the exhaust and see the idle dip at a stop but there was a cop down the street muggin me haha but when i drive it and hold the rpms at 2000-3500 cruising it makes that sound, but at higher rpms it feels good

[Ninjabread]

almost sounds like mine which is running on 3 cyls.

you sure they are all firing?

[darkslide]

i checked the plugs yesterday because my car wouldnt start, all the plugs were fouled so bad they couldnt spark, put new plugs and it fired up as for checking all cylinders i just checked cly#1 for intial spark when i was checkin why my car didnt start yesterday.
edit: cap and rotor are fine if anyone was gonna ask no carbon tracking on either

[flip3d]

subaru :P

check your injector seals

[Size]

engine coolant temp sensor?

[kandyflip445]

Leaky injector probably. Sounds exactly like what I had.

Do a power balance test.

Start the car with the hood open. With the car running unplug each injector 1 at a time. The injector that doesn't make a difference in your idle will be the cyl. that has the problem.

[icemhan_21]

it behaves exactly like mine when i changed my spark plugs and forgot to put 1 spark plug wire back on so i think your running on just 3 cylinders. check your spark plugs, wires, distributor and injectors..

[darkslide]

subaru :P
^^^LOL!!!

Leaky injector probably. Sounds exactly like what I had.

Do a power balance test.

Start the car with the hood open. With the car running unplug each injector 1 at a time. The injector that doesn't make a difference in your idle will be the cyl. that has the problem.

^ill try that tomorrow morning

also has anyone ever dealt with a clogged catalytic converter?? i was also planing to do a back pressure test and check vacuum tomorrow as well

[JeremyR]

i'll take it for 200 cash money as-is. lmk. ;)

[darkslide]

i'll take it for 200 cash money as-is. lmk. ;)
LOL SOLD!!! JK did u guys go out tonight?! haha
edit :^^ hey do u got a test pipe i can borrow?!!? lol just incase

[darkslide]

just thought i'd up load another video of the tests i did today .

first vid is of engine vacuum its kinda hard to see.. but yes.. its a snap on vacuum tester =p haha but really it was reading 10-13 in of vacuum, that doesnt look good =[

http://www.youtube.com/watch?v=b9x_TsqfIkI

second video isn't here cause i tried to delete a pic from my camera n ended up deleting the video hahaha but it was of the back pressure tester, I've never used one of these so maybe someone here can help me, it was reading 1-3psi. it wasn't steady though it was jumping up and down very erratically . is that mean there is restriction in my cat?

[Def]

It doesn't sound like you're running on 3 cylinders.. just sounds to me like you're running rich enough to misfire some. It honestly doesn't sound that far off from my HKS cam'd car on the cold start.

I'd say check the coolant temp sensor, injector seals(pull rail and turn the key to ON to see if fuel leaks by), and then the MAF sensor.

[datsun510dude]

sounds like my car did for a few months. I replaced a lot of stuff that people said to....coolant temp sensor, plugs, plug wires, cap, rotor, clean egr and aiv....turns out the spark plug WIRES were at fault...and YES, I did replace them with NEW units from AUTOZONE. One word of caution....DO NOT buy these plug wires, the #3 wire was dead out of the box..... and the reason I replaced them was because I was getting the same stumbling and hesitation that it looks like there. Sooooooooo, I had ordered some 10mm fiberglass shielded race wires and im EXTREMELY happy. All the connections are glued in place and are also numbered, unlike the cheap wires from autozone/kragen/napa that do not have the boots glued on and are a REAL pain in the ass to remove w/o breaking. Got my wires for $60 if your interested.

[darkslide]

It doesn't sound like you're running on 3 cylinders.. just sounds to me like you're running rich enough to misfire some. It honestly doesn't sound that far off from my HKS cam'd car on the cold start.

I'd say check the coolant temp sensor, injector seals(pull rail and turn the key to ON to see if fuel leaks by), and then the MAF sensor.

yeah its more of like a lean or rich misfire it seems. i tired a s14 obd2 maf, the pig tail didnt fit but i made some wire extension w/male and female connectors at the ends hooked it up but it ran the same, gonna try testing the cts and compression. n see if i can borrow someones working plug wires.

[bo2o]

13 vacumme is bad....

u might have a fuked up cam or valves.
snap throttle and see if it drops and picks up.

are your plugs still fouling out?

compression test, power balence test next.

[darkslide]

13 vacumme is bad....

u might have a fuked up cam or valves.
snap throttle and see if it drops and picks up.

are your plugs still fouling out?

compression test, power balence test next.

yeah the plugs are fouling out, i did a compression test but mid way my battery died lol so im charging it right now and gonna try again later
edit: as for the power balance test, i disconnected each injector one at a time, the idle right now isn't so steady to where i didnt really notice much of a drop when disconnecting

[tt99ol]

sounds like a huge air leak or a few vac lines leaking
get out the brake clean and check
and pull codes from your ecu, might be a coolant temp sensor

[darkslide]

sounds like a huge air leak or a few vac lines leaking
get out the brake clean and check
and pull codes from your ecu, might be a coolant temp sensor

im a check those sneaky vacuum lines after i recover from this nasty hangover.... no more tequila :barf:

[oversteerplease]

Vac leak! I just found mine yesterday.I had the same exact problems you're having.

[darkslide]

An update .. i did a compression check and it was good =]
and today i was looking for vacuum leaks and didn't find any. i forgot why i did this but i took off the vacuum line going to the pcv breather on the valve cover and the car smoothened out and the idle sounds normal so i checked vacuum at the brake boster vacuum line and it was 19. so im guessing my pcv is clogged or egr is kinda open?
is pulling up on the egr diaphragm a legit way of testing it?
and where is the pcv valve hidding? i dont know where it is..

[Def]

Too much EGR or a bad PCV valve could do that.

On an SR I think the PCV is integrated into the passenger side valve cover vent to the intake manifold, probably around there on a KA too.

[singlecamslam]

On a single cam motor it is here http://www.angelfire.com/extreme/hawaiianhardbody/images/engine/PCVvalve.jpg

[darkslide]

update from hell! yeah its been awhile i started over again just cause it was bothering me i felt i was going in to deep when its probably not that complicated... i ended up buying nissan datascan for my laptop to check a few sensors at a time, i noticed my MAF was bad, it was reading 1.2v-1.7v when the car was off so i plugged in a different one and now its fine. but i still got my problem. i also replaced my pcv (pita!).
now i ran my car again and now see my timing jumps around at idle. i've done a power balance test and i have to pull off 2 plugs or turn off 2 injectors before i hear a difference, doesnt matter which ones .

[UNISA JECS]

You need to reset your base idle and timing, have you done that?

[darkslide]

You need to reset your base idle and timing, have you done that?

no i havent :doh:... how do i do so? just use the idle adjust screw while the tps is disconnected then adjust timing?

[SoguRacing]

when you did your vacuum test you needle wasn't steady. maybe have bad valves/springs. also low vacuum. 10-13 when it should be around 17-21.

[dued]

Post removed! made a poor assumption.:love:

[Devil Man]

any update on what you did. i am having the same issues but i removed my egr and swaped the cams, but i am having the same boucning and running super rich issues. i am on my way now to buy a coolant temp sensor cause like yours mine isnt working either.

[darkslide]

any update on what you did. i am having the same issues but i removed my egr and swaped the cams, but i am having the same boucning and running super rich issues. i am on my way now to buy a coolant temp sensor cause like yours mine isnt working either.

sorry havent updated in a while but i pulled some codes using nissan data scan and found that i had a code 11 and 21 which is weird cause i pulled codes before and got nothing, i talked to a few guys and they said its possible that it didnt set because it didnt complete a drive cycle, so i read into the fsm and found that if both codes come up check causes for 11 first crankshaft position sensor, checking it only gave me the options of if its not the harness its the sensor. i checked the harness it seems ok so im waiting to find a cheap dizzy to swap in.