Hey guys!
I have already posted about this but I have done so much since, I thought I should re-try and see if there is any new insight from anyone.
So... I am havin some hesitation when starting my car in th mornings,after work. The best way for me to explain it is if I start my car when cold leaving it in "park" and while idling I slowly start to press the gas peddle to hit 2000rpm. Once it hits 2000rpm. And I let it hang there, my rpms slowly drop back down to 1500 rpm ( like I was slowly letting of the gas peddle but I'm not!). I can push the peddle down hard and it will normally increase in rpms above that mark its only when I gently push the gas peddle down I notice it. Same with driving, if I take off slow it feels like I'm running out of fuel or its missing, if I take off fast I don't notice it... Once it warms up its almost completley gone, but... I can still ever so slightly feel the miss or lack of fuel only if the rpms are at 1700 when warm,like if I'm cruising around in any gear 1700rpm is a common spot for the rpms to sit when cruising. its kinda hard to explain... When its cold and its in idle its not missing or even hesitating for that matter its like "I get the rpms to 2000 and it slowly backs down to 1500" like someone else is controlling the throttle and allowing it to drop back to 1500ish and keep it there unless I press harder then it will launch above the 2000rpm mark... So when cold, my idle is good, from 1200rpm to 1500 rpm is good and from 2000 rpm and up is good its just that one area its messin up.
I have cleaned:
Throttle body and iacv.
Maf sensor
Intake air temp sensor
Entire upper chamber with a moto vac.
I have tested:
Maf (even put a replacement in after resetting ecu. Still the same)
Tps ( idle at .43 and had a very easy steady increase from there up)
Battery and alt.
Checked for vacuum leaks (none minus a very insignificant one around my egr, apparently its. Super common and will not create a problem so my mechanic says.
Checked fuel pressure... Its good
Things I've replaced:
C.t.s
Plenum gasket
Fuel pump and sock
Spark plugs
Air filter
I have done lots to this car to resolve the problem and have had no luck! Has anyone else endured this problem and discovered a fix, is there anything else you can recommend for me to test or replace, to me it seems like a tps cuz it only happens at a certain rpm range but its reading good numbers, I don't thing its the ignition system because its fine going up hills at any rpm range with no miss, its only at that certain rpm range it acts up and worse when cold.... What could it be

 

Maybe it would help if you posted a video of what it was doing?

 

Lol, trust me I would have done that in one of the first 6 post I've put up about this issue, the best explination I can give you is, if you started your car and got your rpms up to 2000 rpm and slowly let them drop to 1500 that's what my rpms are doing. When I drive away cold there is a "dead spot in the same rpm range when cold, once it warms up I can sit in idle and it revs normal, but if I take off I can feel like a miss in that rpm range, its like its the tps cuz its bad when in open loop, once it warms up its not so bad because the 02's have stepped in to correct it.

 

It sound s like bad IACV valve.

 

I wouldn't think its would be... Isn't the idle air control valve only for idle and closes once the throttle is applied? My idle is good, I heard that the main sensors for your max is the MAF sensor and the TPS sensor, both those work when your engine is cold as your primary sendors for fuel and air, once warm its your MAF and 02 sensors. You TPS will still be used with a warm engine to determine shifting points. I have replaced my MAF temporarily after resetting the ECU and no luck. I have tested the TPS , it read from closed .43 to 4.75 or something around that ending range lol, it had a very good sweep with no drops in volts. Could it still be a suspect?

 

I also notice when I start it in the mornings, an get the rpms up to 2000 and let it "bog down to 1500 I notice my dash lights sorta flicker a bit, and.... I was under the hood playing around with things, I noticed that when I apply the throttle at that same position I get a buzzing noise coming from my starter, the further I push the throttle further its softens up and goes away???? Its there hot and cold... Could it be related?

 

Really....
No one on here has had low throttle hesitation/skipping??? The has to be over 200 dth gen guys on here and not one of you have gone through this????

Hard starting when cold
Hesitates in the morning at low throttle(in between 1500 and 2000 only
Once warm hesitation turns into a "skip" in between 1500 and 2000 only

 

i normally dont sign up to reply to post but ive read your post on several different sites ur post is number 1 on google for hesitation.. but anyway i have a 2000 nissan max with 203,000 miles and ive encountered thids problem since ive most to missouri from virginia, i noticed whille stopped at a light the idle drops from 700 rpm to about 500 hundred when i drove back to virgina over the holidays i didnt have this problem while in va so now that im back in missouri the rpm drop is back, so me being mechanicaly inclined i used some seafoam to try to help with the problem and ran some lucas upper cylinder lubricant to help out, unfortuanly this made the hesitation happen al through out the rpm check engine light came on and it was system to lean so now i have to deal with the hesitation and burn all the fuel in my tank to clear the lucas and seafoam mixture that i used no other codes came up so i would say its the fuel quility for sure find a bp or mobile or a shell oh yea on the drive back from va i clocked 120 miles per qauter tank which is roughly 28mpg definetly not getting that mpg here in mo. like i said trye different or higher octane

 

oh yea the lights flickering your altenators going bad believe me al the light in the car had this distinctive flicker or they get bright then slightly dim repetitivley. i went to the garage to get somthin outta the car and smelled an electrical burn thought it was the house but somthin told to pop the hood a puff of white smoke came up and the battery had swollen somthin in the altenater grounded out i had ignored the lights flickering for like 8 mons hope i helped u in the earlier reply

 

i think our problems are a bit different.... its really hard to understand what you are saying.... i have used 87 89 91 94 none fix it, ive replaced about everything that has to do with open loop and others that could cause this, im now beleive it is an electrical issue.... i dont have any problems with my idle only hesitiation and hard starting mostly when cold unless i have my acc on for a bit then its hard to start warm to ( not the cranking part but actually turning over....



i know im kinda crazy with my car.... i post to much i think i have o.c.d. i cant leave this issue alone its driving me crazy ( im sure all my posts are driving other people crazy to) but until i find it i wont stop, its a process of elimination and im about 75 % there!!!!!!!!

 

Hey there, I'm having a simular issue with my 200 max, but I also have some hard starting issues and the cut out between 1500 to 2000 rpm is a lot more noticeable when cold. So far I have repaced the following, cts upper plenum gasket, plugs, fuel pump and filter. I've tested coils, fuel pressure, tps, I did test the maf but I don't know if I did it right lol. I've cleaned my iacv,tb,intake, performed a moto vac, and a smoke test, my mechanic said its normal for a small leak at the egr and even replacing it probably won't stop it from having. The leak.... I've done pretty much everything and its still there with no check engine light, if yours only happens when warm I would suggest. 02 sensors, if its only wjen cold, I'd suggest a tps, if happening hot and warm usually a sign of a bad maf but a bad maf doesn't really happen at low rpms its higher up in the rpms it buggers up, which is why it puts it into limp mode to prevent further damage.

If you find out the problem let me know and I will do the same, even though our engines a different it could have some sort of relation....

 

ill give it a try later...

 

I just bought a 01 maxima 5spd with 67k on her, i was having a similar problem and they changed the ICV & TPS. Once the TPS was replaced i didn't have this problem anymore. My issue was the same and also it was bucking in first gear.

 

tps.. everything is fine now.. it was the open closed circut on the lower plug of the tps.. ill post back if my problems return

 

Hello I am having this same problem on my 2006 Infiniti g35 sedan (70k miles) however my problem is constant I thought it was the way I was driving because like you said when I would speed up it would feel fine but when I was trying to go slow past 1500rpm it would feel like it’s struggling and the muffler sounded clogged as well is the best way I can put it, also like you said once it hit 2000rpm it would drop down to 1500 even without me pressing the breaks. I’m really hoping this is not a major issue. Did you happen to find a solution?

 

please read the entire thread, and check for dates too.

 

Hey man, I have the same problem with my car, maxima 2001 vq30de, how did you solved the problem? Please help me🙏

 

weird stuff happening in the 1500 RPM area is a faulty TPS
now lucky for us, this engine, the TPS has two connectors, one grey, one red/orange/brownish
so what you want to do is turn the car off, very carefully disconnect the red/orange/brownish gray/grey one, then start the car and take if for a drive
if the issue goes away, you have located your problem

in my case, there is an electrical problem somewhere, I put a new TPS, 5 minutes later it get fried and the problem comes back, so I just drive with it disconnected all the time
this is obviously not a real fix, but I've driven that way for years (i usually never go above 2500 rpm in normal driving) and haven't noticed any issues.

 

Thank you, I will check this solution, I hope this will solve my problem🙏🙏🙏

 

my bad, disconnect the gray one!

https://maxima.org/forums/5th-genera...ml#post9250523

So it's been 3 years I've been driving like that...

 

Hello again my friend, I have a question, when I disconnet the grey socket, will the problem solve immediately or it takes time and I have to drive the car for example 100 miles to solve the problem?
Thank you a lot🙏🙏🙏

 

You will notice it immediately.

You can leave the car in Park/Neutral let the engine warm up for a minute or two, then rev from 800 to 2200 and back to 800 slowly, it should be smooth without any issues.
Then take it for a drive and see how it behaves.