I replaced the TPS yesterday, and the car is still idling the same...what gives? The only code I am throwing, is for my O2 sensor behind the cat.

 

ewuzh, I did not factor out a leaky IACV. Where would it leak? I have the gasket in there. Also it is making that rythmic ticking noise.

 

cardana24 Do you have a FSTB by any chance? I have a thought....

http://forums.maxima.org/showthread.php?t=468300

 

Mine makes the ticking noise also. I thought it was internal engine noise at first, but I put my ear to the tip of a screwdriver and found it was loudest at the IACV.

I had a strut bar too but I did not have any clearance issues like that. Also, I do not have any sort of check engine light like the one VIP_Maxima got.

Ok, it is definately not the MAF because I swapped in a Z32 maf and new injectors this weekend and it did not fix anything. I also changed the upper intake manifold gasket while I was at it, but I still idle around 1100.

 

I'll check that, but I don't think I have that problem. I hope not because I just sold my extra purge valve.

 

Spray some water around your hoses with the engine running(cold engine) and see if you can find some bubbles. Might as well do all around the IACV and anywhere you can think of.

BTW your car looks like it has monster power!

 

Tried some things this weekend, but no luck

Replaced the idle air stepper motor (name?). The metal part next to the black plastic EVAP thing. Didn't fix it.

Bought a multimeter and tested the TPS voltage. Voltages were correct. TPS works perfect.

Probably not MAF related because I just changed to a Z32 MAF, and it still idles high.

I thought it might be related to the fast idle cam so I played with that a bit too but it didn't help.

I'm starting to think it's a tiny vacuum leak somewhere.

 

I am still having the same problems as well. I am guessing either a vacuum leak or a ground issue (If that would even cause a high idle).

 

can't find the screw to adjust under the hood?

 

I guess your going to have to do what no .orger likes to do.














Bring Your Car To The SHOP

 

LOL!! That's what my friend just told me to do! I said Not yet, I still have a couple ideas!! Although I just swapped in some different coil packs and nothing changed. I have some injectors that I'm going to send to deatschwerks to have cleaned in a week or so. I also need to check on the clutch and bleed it/adjust pedal just to keep my peace of mind. I think a vaccuum leak is probable but I hope that's not it..

 

UPDATE: Problem fixed. Change your PCV valve

I can't believe this 4 dollar part would cause idle problems like that.

 

I actually figured out my problem this weekend too. Mine was not the PCV valve. Mine was the actual idle adjustment screw. I was always under the impression that the idle screw was the plastic screw on the IACV, when in fact its the little one on the throttle body. I adjusted that screw and my base idle went down and the car stopped surging. The car feels so much better now.

 

is your problem still fixed? my problem is still here...the car will be fine then once I have driven it for a while the idle will jump up to 1500-2000 steady. I did notice when I took my TB off today it had some oil on the back of the butterfly plate. Could something be messing up in my PCV system? Could the hole be clogged that the PCV valve goes into?

 

Question:

I just bought a 99 SE with 107K miles and lately, in the cold weather, the car has been idling very high, 2000-2300. Whether I am starting the car first thing in the morning or 30 minutes after driving it when the engine is already warm, as soon as i start it up it idles around 2000 for 20 seconds before eventually lowering below 1000. Is it something that I need to worry about? I have no lights coming on but it is just been something that has caught my attention over the last couple days. The car still runs and drives great. It only happens when i start the car. Any feedback is appreciated.

 

Hey guys,maximas are amazing and i love mine but i hate this bull****,ok in the morning sometimes i have to let my car heat up or sometimes it will just stall and shut off then its struggles to start again but it will then it wont happen for about a month,also when it comes to the idle ill start my car in the mornings when its cold and the car will idle at 1500rpms then after it heats up a little it will go just down under 1000 rpms im guessing 7-800 rpms and then if i start to go down the road just after sometimes it will get jump and **** when i push in on the throttle and its almost like its going to stall and it just gets all jumpy and **** but after about 5 mins of driving its fine,whnever i start my car it always goes to 1500 rpms and depending on how long i havent drove the car it will go down just under 1000 rpms,wondering wtf that could be and on top of that i hace my cel on and its for knock sensor and o2 sensor which iam currently replacing,also i dont know what pvc valve is,ive heard of it but im learning and have come along way but still **** im trying to learn and doing all the work myself cause i cant afford any shops also whats a tps,Iacv and fstb, when i know what things are i can look and work on the problems then and one last thing im doing 00vi swap soonim guessing that would fix the problem wouldnt it becuase all that is getting replaced

 

same problem here but my idle sometimes goes to 1200 or 1500...do you have a picture of that screw that you can post and circle for us to take a look? thanks a bunch!!

 

I do not have a picture. But its a very small fine threaded bolt, that has a little stopper nut on it. You turn it clockwise to lower your idle and counter clock wise to raise your idle.

I worked on this again yesterday and I am still having the same problem. I replace my PCV valve with a brand new Nissan PCV valve. I pulled the throttle body off and set my TPS to spec. Once I did this I put the throttle body back on with its gasket and I added some copper gasket maker around the edge to make sure it was sealing. Well I am still having the same problem. Everything seems fine when the car is warming up and the idle will drop down to around 700-800 once the car is warm. But after driving for ~15 minutes the car will idle around 1800. What would cause this? Something is causing it to idle high after it has been running for a little while. Has anyone delt with this?

 

this is obviously a pervasive problem that a good number of the 4th generation Maxima owners have. I started experiencing mine around the winter of 2005...but for the good part of the summer of 2006, the idle was normal after a good cleaning of the TB, and IACV around March of 2006. Summer of 2006 was occasional. My symptons happen after driving in the highway for a period of time...then it would idle around 1500 (AC off)...the idle would go back to about 750 or so if I shut the car off, and immediately restart it. So that was interesting.

As the weather progressively got colder in the Northeast here, the idle issue came back...so I am not sure if ti has anything to do with temperature. But the PCV is new, IACV and TB is clean. I did mess around with that screw (by the brake fluid reservoir) to move the idle around...doesn't seem to help...

I think the next thing to do is to call Nissan, USA. I am going to explain to them the issue to see what their take is. I am counting that there must be 50 or so members who have bought this issue up. I'll post any information i obtain from them

 

When your setting your TB to spec, are you using Feeler Gauges and a Multi-Meter ?? You must follow the directions in the Haynes Manual to setting the TPS. Its very precise and takes about 1/2 hour to get it Perfect.

I am having a HORRIBLE Surging problem since I put on my IACV block and my Pathfinder TB. I believe too much air is entering the manifold and the IACV Is trying to cominstate. The TB plate needs to be closed a bit to where its idling good, then the TB needs to be pulled and the TPS adjusted to spec again.

-matt

 

The amount of air entering makes sense...and is interesting to note. I notice this is more pervasive in the winter than the summer time, where in the winter the air is denser while in the summer the air is not as dense.

so then, would we need to reset the TPS after each cleaning according to the specs provided in the manual?

 

I had exact same problem with my car everytime I cleaned the TB. After about 1K miles everything came back to normal. It happened to me 4 times and I don't know what caused or fixed the problem but the car is running perfect.

 

I am using a multi meter to set the TPS.

 

Are you running 555's ??

 

the car that this is happening to is N/A. My boosted car idles fine, but I am running 370cc's and A32 MAF.

 

I just think all these problems are from TOO Much air entering through the TB or a leak causeing the IACV to freak out and try to correct it, causing the surging.

-matt

 

my question about this is, why would it only happen after the car is warm and has been running for a while? I wish I had another 95 throttle body that I could test on the car, one that will fit the 1 plug TPS. I am wondering if when I bored out my TB this some how affected something. I did not take the butterfly out and I used a flapper wheel.

 

does anyone have any ideas on this? I as at the ATM last night and the car was idling fine around 800, and while I was sitting there it idle up to 1600 and stayed there. The car was warm when this happened. What can cause this? Its only has a high idle problem once the car is warm and has been driven for a while. I have another throttle body I am going to try on the car. Any ideas area appreciated.

 

i think it is temperature or pressure related. Two days ago when the temperature dipped to 10F or so here in NYC, I drove to NJ...and my idle when i put the car in N or P...went to about 1600 as well, which was very high for even my car...but one warmer days 50F or higher, idles pretty normal around 750 RPM or so in N or P...that is just my observation of the symptoms...

 

Hey Cardana24... My idling is being "weird" again too. Even after you put on the new TPS. Ran fine for awhile, but within the last week or so it has started back.

 

I have noticed the same thing with my car. It seems when it is in the 20's or below here it wants to idle high. But on the warmer days it idles just fine...I don't know. Since I reported back I have changed my Throttle body and that has seemed to help a lot. I had messed with my idle screw so much on my last throttle body, that I just wanted to start fresh since according to nissan you are not suposed to move that screw. My car is idle much better now but it still gets a little high ~1.5K RPM when its really cold out side.

 

That's not good. I think you need to start trying to figure out the Check Engine lights you have, and making sure all of your vacuum lines are hooked up correctly.