MOHFpro90

iTrader: (11)

Alright guys, so I am kind of getting fed up with this. I have been having some various idling issues lately and its bugging me. I cant seem to figure it out. Symptoms:

- Idle drops to 300-500 when I let off gas and stop, then comes back up to ~600.
- 900rpm cold start idle, ~600 warm
- Vibrations from low idle when in D and stopped.
- Sputtering and dying when I stop(cold or warm)
- Loss of power steering at low speeds

I have recently replaced/checked the spark plugs, coils, injectors, cleaned TB, no vacuum leaks.

My 00VI setup is:

00 UIM, TB, IACV
A32 LIM, Rails/Injectors, Rear VC and TPS

I have one CEL right now, and it is 0407 for the Crankshaft Pos Sensor Ref. As per the FSM, this will not affect the idle.

Is it possible that a low oil level could cause this? What about the 00 IACV? I thought that caused different symptoms, not low idle and dying?

Thanks guys!

speed racer

iTrader: (10)

I had similar symptons but not exactly like yours. My idle would rise very high. It would also drop very low when braking but come back up. In the end my MAF died after a year of dealing with this. The new MAF is a lot better but still eradicate. At least my car is staying on.

DrunkieTheBear

iTrader: (17)

You know kyle I forgot to mention the other day what happened to me that was strange. I changed my oil and was cleaning the filter but started the car without the filter and it cause my car to have a very unstable idle, kind of what would happen to you when I put it in D it would drop so low it died. So maybe that AEM filter is causing the air to be erractic across the MAF. I'm really leading towards your MAF not getting a good reading, maybe we should try my JWT when we get a chance

ajcool2

iTrader: (43)

I had the exact same problem and it was a vacuum leak between my UIM and LIM because I stripped 2 bolts. I switched out the LIM and it has run perfect ever since.

MOHFpro90

iTrader: (11)

I am also wondering about a MAF, but Im not sure. Anyone got one they want to lend so I can try it? No tengo dinero.

mywhitewolf

i had exactly that problem with my 00vi setup also using the 00 TB & IACV, now i have the oppisite.

to fix i recalibrated the throttle position sensor and wound out the TB stop screw. But now my problem is that it sits at about 900rpm in D and 1100 in N. better than cutting out after flooring it though.

MOHFpro90

iTrader: (11)

I am pretty sure my TPS is calibrated correctly. I calibrated it once, I tried to get it dead on. When you're talking about the TB stop screw, are you referring to the one that controls the throttle plate?

97Maximus

iTrader: (18)

what does your intake tubing setup look like? what im getting at is how close is your maf intlet to your air filter.. it sounds like it may have to do with that.. you may have a MAF trying to go out.. when mine went out it was intermitently acting up.. and kept getting worse and more repetitive before it bit it.. can you rev it up and make it quit.. mine would do that too.. act up.. i would rev it up and it would idle fine.. the heating element inside just eventually craps.. if you had a vacuum leak it would do the exact opposite tho.. rev/idle to high.. i had that problem.. this sounds like a sensor tho

MOHFpro90

iTrader: (11)

My intake is as follows:

TB -> Accordian section -> MAF -> MAF adapter -> Filter

I agree, I am sure its not a vacuum leak. I think its a sensor somewhere, however its not going to be easy to diagnose until it actually dies.

JonBlz

iTrader: (11)

car should idle at 650-700rpm

MOHFpro90

iTrader: (11)

Mine stock idled at ~700-800, not 500-600.

Tatanko

iTrader: (34)

Especially being an auto, you should get something on there in between the accordion section and the MAF. Do you not have hoses hooked up to the intake at all? Given the '00 IACV you wouldn't need one, and I'm sure you could split up or find another vacuum source for the one that gets used on the intake...so do you just have a breather filter on your valve cover?

MOHFpro90

iTrader: (11)

I unplugged my maf and started the car. It acted like it had a vacuum leak(when in P or N), as in it would go from 700-1k rpm and fluctuate there. It stayed at ~700(in D) and twice it died due to shifting from N to D.

Not sure exactly what that means.

I am going home this weekend, so I can fool around with the intake setup, check any more CELs and just try a few things.

mywhitewolf

Yes.

more questions:

Was it ok before the swap, did it start playing up straight after the swap or was it ok after the swap?

97Maximus

iTrader: (18)

our MAF housings dont really have anything fixed in the housing or in the intake tubing to make a 'laminar' flow.. seeing as you have your MAF almost directly connected to your air filter keys me off that your MAF isnt making a good reading.. Especially if it is dying.. Which i still think is happening.. how long has it been doing this? and like tatanko stated do you have anything blocking where your original IACV (4th gen) connected to your intake pipe?

MOHFpro90

iTrader: (11)

I have had too many issues since the swap in January to really 'pinpoint' when this arose. (from multiple vacuum leaks, bad MAF, bad TPS, uncalibrated TPS, etc etc)

When you say "do you have anything blocking where your original IACV (4th gen) connected to your intake pipe?" I am not sure what you're talking about. I have the 00vi with 00 IACV. I am not running a mid pipe, so there is no 'old IACV hose' or anything. The only hose is the valve cover and it has a breather filter.

97Maximus

iTrader: (18)

ok so you completely eliminated the square section after the acordian piece on the stock setup.. hmm... i know this is repetitive but i still think a MAF going out may be an option.. but then again i didnt use the 00 IACV soo.. its still a little hard to diagnose.. is there any abnormal jumps throughout your rpm band? the pink and purple sensors that were normally plugged in around your 4th gen IACV what did you do with those?

MOHFpro90

iTrader: (11)

Those are just dangling. And no, besides the VI(*gets giddy thinking about it*) there are no abnormalities in the power band.

97Maximus

iTrader: (18)

i think that may be the cause of your idle issue.. after reading the FSM.. the pink and purple sensors are used in reference by your IACV to adjust idle when those are being used (under load).. but the ECM references the Crank Pos Sensor to adjust the IACV stepping amount.. i think by using the 00 IACV your ECM cant match up the correct stepping with the Crank Sensor reading.. after reading the last sentence of the FSM (EC-255) talking about the IACV. It states:

The target engine speed is the lowest speed at which the engine can operate steadily. The optimum value stored in the ECM is determined by taking into consideration various engine conditions, such as warming up, deceleration, and engine load (a/c, power steering and cooling fan operation).

after reading that and knowing that you have the pink and purple sensors dangling and youre using the 00 IACV.. tells me your ECM cant figure out what load your engine is under to adjust stepping for the IACV.. along with the stepping adjustments not matching up with your Crank sensor (a32 crank sensor and a33 IACV).. your setup is all hookep up as best as possible with what youve chosen to use.. your ecm just cant figure out whats going on.. get a 4th gen IACV! problem solved.. haha.. goodluck man

97Maximus

iTrader: (18)

oh yeah get a fsm too.. this thing is the best reference ever.. especially when youre doing something as in depth as this swap..

ajcool2

iTrader: (43)

Hook up your midpipe.

MOHFpro90

iTrader: (11)

97, I have an FSM, dont worry haha.

Aj, I am going to hook up my midpipe this weekend and see how it works. I will let you guys know.

MOHFpro90

iTrader: (11)

I installed a mid pipe between the filter and MAF. I also cleaned the MAF. No luck, car still stalls and acts up.

93altima

iTrader: (5)

i have a full DEK mines idles at 800 perfectly and i left the 5th gen IACV unplug'd

MOHFpro90

iTrader: (11)

What TB are you using? Youre running the DE ECU?

MaXiM@KiD

iTrader: (3)

I'm running my 00vi flawlessy with no problems at all no cold starts nada....what IVAC are you using? Did you use new gaskets or re-used old one?

The problem you had I had at the beginning....I adjusted my idle and I was good for a while then started having similar problems again. I'm using a 5th gen IVAC. Turn out the plug I was using fell out and was dangling giving me many cold start issues. I used a 5th gen plug which doesn't fall out, also had a dead injector. I havent' had any issues after that.

Make sure all you vacuum lines are plugged and and that none of them are pinched anywhere...adjust your idle and re-calibrate your tps.

MOHFpro90

iTrader: (11)

How do I adjust my idle on a a33 TB? Its not like the A32 TB where it has the screw adjustment.

aznprid972

iTrader: (26)

I thought the idle was adjusted via the ECU? I could be wrong but that was what I was finding when I was searching the other night. Might be an A33 thing?

MaXiM@KiD

iTrader: (3)

There's a lil screw on the left side right underneath the throttle cables.....you have to loosen the nut then adjust the screw..then re-tighten the nut..It seems like you just need to adjust that and you should be good.

You cold start has to be something with you vacuum line or the harness i was talking about. spray to TB Cleaner and see if you can see anything leaking.

My boy is going to snaps some pics of my setup because he's going to be doing the 00vi install and want to use my pic as reference. When I get them I'll post it here

MaXiM@KiD

iTrader: (3)

Try to get a hold of a 5th gen harness to plug in. The 4th gen you have to break the around the plug and bend the pins a bit. The 5th gen fits snuggly and shouldn't fall out.

aznprid972

iTrader: (26)

Thanks for the picture MaXiM@KiD. I need to bump up my idle a little.

MOHFpro90

iTrader: (11)

My cold start issues are caused from my Crankshaft Position Sensor Referrence code, I am sure of.

My IACV plug is making good contact I. Thanks for the pic of the screw, I might try that!

MaXiM@KiD

iTrader: (3)

No problem..and the pink and purple sensor are used on the 4th Gen IVAC...on the 5th gen IVAC if they aren't plugged in the don't do anything, so don't worry about those.

MaXiM@KiD

iTrader: (3)

any updates?

MOHFpro90

iTrader: (11)

No sir. I am trying to find some time to work on it, but my appt complex is kinda **** about stuff and we're not supposed to work on cars in the parking lot. And I am trying to fight off what I think might be the flu.

Nevertheless, first thing I plan on doing is adjusting the TB stop screw, make sense?

MaXiM@KiD

iTrader: (3)

Yes...and if your still having problems after that then go around looking at your vacuum lines

MOHFpro90

iTrader: (11)

Okay, so today I went to go try to work on my CKPS code. I have 2 other codes.

0102 - Mass Air Sensor

0205 - Idle Speed Control Sensor

0407 - Crankshaft Position Sensor Referrence

Where should I start?! I know the MAF just needs to be replaced. Is it possible that the IACV code could go away when I replace the MAF?

What is this controversy surrounding the 5th gen IACV?

hi-tek22

iTrader: (4)

Bump for my car dying at Idle, instead of ideling....it only dies when revved up and the engine is warm....Its pretty much NOT drivable