Notices
Engine & Drivetrain VQ Power and Delivery

Idle issues!!

Old 03-22-2018, 10:11 AM
  #1  
Trades2much
Registered User
Thread Starter
 
Join Date: Mar 2018
Location: Millersburg,Oregon
Posts: 26
Likes: 0
Received 2 Likes on 1 Post
Default 2007 350z Idle surging issues!!

so I just purchased a 07í 350 enthusiast model. Previous owner had the battery go dead and changed it, now after starting the idle surges between 1-2500k. I knew that it would need a relearn so I bought the car. Tried an IAVL procedure at least 100 times with a stopwatch, Iíve reset the ECU, throttle vale relearn, swapped the throttle bodies etc. still the same thing every time, revs to 3k when cold then starts dropping to 2k and then up down up down blah blah blah! I had planned on a reflash but the Shop that does it thinks it wonít change it?? Any tricks, I know Iím not the only one who has had a Z that wonít telearn? Also, no codes set, all data appears to be in check except the throttle actuator voltage going up and down. Drives perfect other than idle, disconnect either throttle body while running and it idles perfect but after plugging back in no throttle response until that codes is cleared then instantly starts surging again. If I put it in gear and slip the clutch to lower idle then the voltage stabilizes? Please help before I dump the car Iíve wanted for years!

Last edited by Trades2much; 04-08-2018 at 04:46 PM. Reason: wrong title
Trades2much is offline  
Old 03-22-2018, 10:23 AM
  #2  
travlee
Master
iTrader: (8)
 
travlee's Avatar
 
Join Date: Jul 2011
Location: Texas
Posts: 37,939
Received 5,985 Likes on 4,130 Posts
Default

check for vacuum leaks
travlee is offline  
Old 03-29-2018, 02:15 PM
  #3  
Trades2much
Registered User
Thread Starter
 
Join Date: Mar 2018
Location: Millersburg,Oregon
Posts: 26
Likes: 0
Received 2 Likes on 1 Post
Default Still wonít idle!!!

update, I had the ECU reflashed even though it had the most current update, I checked for vacuum leaks and smoked the manifold. I have tried at least 75 times now and still no change! WTH!!
Trades2much is offline  
Old 04-08-2018, 04:41 PM
  #4  
Trades2much
Registered User
Thread Starter
 
Join Date: Mar 2018
Location: Millersburg,Oregon
Posts: 26
Likes: 0
Received 2 Likes on 1 Post
Default

come on, I know this has been an issue that has plagued many so please help before I sell this POS! I love the car but have tried everything known at least 10 times over and no difference. I see many have posted about this same issue then said its fixed without any definite solution. Please help!
Trades2much is offline  
Old 04-08-2018, 05:31 PM
  #5  
Atreyu'z 350
Registered User
 
Join Date: Jan 2017
Location: Pennsylvania
Posts: 1,908
Received 247 Likes on 216 Posts
Default

Replace your Throttle Bodies..
Atreyu'z 350 is offline  
Old 04-08-2018, 09:29 PM
  #6  
CK_32
Registered User
iTrader: (1)
 
Join Date: Jan 2016
Location: California
Posts: 3,618
Received 358 Likes on 307 Posts
Default

I’d check the plugs, injectors, coil pack, throttle body and all sensors.
CK_32 is offline  
Old 04-09-2018, 07:54 AM
  #7  
Trades2much
Registered User
Thread Starter
 
Join Date: Mar 2018
Location: Millersburg,Oregon
Posts: 26
Likes: 0
Received 2 Likes on 1 Post
Default What?

As I said in my original post I have changed the throttle bodies. I have monitored all pids and All are in check, plugs have 15k on them, no need to change coils as they are working. This car runs flawless short of the idle surging. Seems like people are just throwing parts at these and the problem fixes itself. Iíve read so many posts about the same issue and everyone is doing the same thing but no explanation of what realty fixed it.
Trades2much is offline  
Old 04-09-2018, 08:37 AM
  #8  
Atreyu'z 350
Registered User
 
Join Date: Jan 2017
Location: Pennsylvania
Posts: 1,908
Received 247 Likes on 216 Posts
Default

Originally Posted by Trades2much View Post
so I just purchased a 07í 350 enthusiast model. Previous owner had the battery go dead and changed it, now after starting the idle surges between 1-2500k. I knew that it would need a relearn so I bought the car. Tried an IAVL procedure at least 100 times with a stopwatch, Iíve reset the ECU, throttle vale relearn, swapped the throttle bodies etc. still the same thing every time, revs to 3k when cold then starts dropping to 2k and then up down up down blah blah blah! I had planned on a reflash but the Shop that does it thinks it wonít change it?? Any tricks, I know Iím not the only one who has had a Z that wonít telearn? Also, no codes set, all data appears to be in check except the throttle actuator voltage going up and down. Drives perfect other than idle, disconnect either throttle body while running and it idles perfect but after plugging back in no throttle response until that codes is cleared then instantly starts surging again. If I put it in gear and slip the clutch to lower idle then the voltage stabilizes? Please help before I dump the car Iíve wanted for years!
Originally Posted by Trades2much View Post
As I said in my original post I have changed the throttle bodies. I have monitored all pids and All are in check, plugs have 15k on them, no need to change coils as they are working. This car runs flawless short of the idle surging. Seems like people are just throwing parts at these and the problem fixes itself. Iíve read so many posts about the same issue and everyone is doing the same thing but no explanation of what realty fixed it.


No, you said you SWAPPED the throttle bodies. That's not the same as REPLACE. Or is that 'your' slang for replaced?
Atreyu'z 350 is offline  
Old 04-09-2018, 08:43 AM
  #9  
Trades2much
Registered User
Thread Starter
 
Join Date: Mar 2018
Location: Millersburg,Oregon
Posts: 26
Likes: 0
Received 2 Likes on 1 Post
Default

I replaced them with a set off a running car with 30 k, my throttle bodies worked on the other car
Trades2much is offline  
Old 04-09-2018, 09:11 AM
  #10  
Atreyu'z 350
Registered User
 
Join Date: Jan 2017
Location: Pennsylvania
Posts: 1,908
Received 247 Likes on 216 Posts
Default

OK. Gotcha.. Did you try replacing your throttle control motor relay within the IPDM? Did you check the condition of the wiring and harness leading to the throttle bodies for exposed wires/shorts? Did you check behind, and within your IPDM for moisture/corrosion..
Atreyu'z 350 is offline  
Old 04-09-2018, 09:38 AM
  #11  
Trades2much
Registered User
Thread Starter
 
Join Date: Mar 2018
Location: Millersburg,Oregon
Posts: 26
Likes: 0
Received 2 Likes on 1 Post
Default

Yes I did check the wiring and all connections on both throttle bodies. Have not checked the ipdm since the car runs perfect other than the surge, idles perfect at 700ish when either or both TBís are unplugged. As I mentioned before, the car had run flawless until it sat for a few months and the battery went dead, previous owner simply bought a new battery and installed then this started.
Trades2much is offline  
Old 04-09-2018, 11:42 AM
  #12  
Atreyu'z 350
Registered User
 
Join Date: Jan 2017
Location: Pennsylvania
Posts: 1,908
Received 247 Likes on 216 Posts
Default

OK. Did you check that relay I mentioned? Try replacing it. It's cheap, so rule it out. Also, look at the IPDM anyway to rule that out. Look behind that relay and throughout for moisture/corrosion. It can still run perfectly and have a bit of moisture/corrosion in that sector of the IPDM, which will effect those subsystems.. I'm just throwing possible stuff out there for you to rule out.
Atreyu'z 350 is offline  
Old 04-09-2018, 03:06 PM
  #13  
Trades2much
Registered User
Thread Starter
 
Join Date: Mar 2018
Location: Millersburg,Oregon
Posts: 26
Likes: 0
Received 2 Likes on 1 Post
Default

Perfect! I will look this eve. This is the kind of info Iím looking for, Iíve been a mechanic for 30 years but donít specialize in Nissan. This problem seems to stump many
Trades2much is offline  
Old 04-10-2018, 10:54 AM
  #14  
Trades2much
Registered User
Thread Starter
 
Join Date: Mar 2018
Location: Millersburg,Oregon
Posts: 26
Likes: 0
Received 2 Likes on 1 Post
Default

So last night I checked the IPDM and all connections are clean, I swapped all the relays and still no change. I did find a very small vacuum leak near the center injector on the right bank. With the throttle bodies unplugged and the engine idling I saw a very small change in rpm with a shot of brake clean. Iím going to change all the orings and plenum gaskets evens though I donít feel that small of a leak is my issue. I ordered the Bluetooth scan module and will download the Niss2 software to see if I can force a relearn.
Trades2much is offline  
Old 04-10-2018, 11:22 AM
  #15  
Atreyu'z 350
Registered User
 
Join Date: Jan 2017
Location: Pennsylvania
Posts: 1,908
Received 247 Likes on 216 Posts
Default

Alright good. The IPDM is ruled out. Now you can focus on that small vacuum leak.. I'm still thinking that you just didn't perform that idle/air relearn correctly.
Atreyu'z 350 is offline  
Old 04-10-2018, 01:27 PM
  #16  
Trades2much
Registered User
Thread Starter
 
Join Date: Mar 2018
Location: Millersburg,Oregon
Posts: 26
Likes: 0
Received 2 Likes on 1 Post
Default

I had a hell of a time finding orings, had to get the through the dealer! I appreciate your concern about me not performing the relearn properly, I have been a mechanic by trade for 30 years so Iím no dummy when it comes to following instructions. I have performed the relearn so many times I have it memorized, all parameters were dead on and I used a stop watch. I have also tried multiple other combinations all with the same result.
Trades2much is offline  
Old 04-11-2018, 01:01 PM
  #17  
PDose
Registered User
 
Join Date: Jul 2012
Location: Virginia
Posts: 62
Received 8 Likes on 8 Posts
Default

Had a similar issue when I cleaned my throttle bottles. I know dumb mistake..But the fix for my car was replacing the ecu cause I fried it. Nissan techs at the local dealership said blown cats would do it as well. After replacing my ecu, it started throwing codes for blown cats.. haha good excuse for getting HFCats
PDose is offline  
The following users liked this post:
pgs (12-21-2018)
Old 04-11-2018, 07:34 PM
  #18  
Trades2much
Registered User
Thread Starter
 
Join Date: Mar 2018
Location: Millersburg,Oregon
Posts: 26
Likes: 0
Received 2 Likes on 1 Post
Default Update

So I just used the BAFX obdII interface and downloaded the NDSIII app which is amazing. Unfortunately I tried numerous times to perform the IAVL learn but it fails every time, also will not perform the Exhaist valve T/C learn. No codes and still all pids appear in check. So stumped!! Idles at 3k when started cold then after about 1minute it drops to 2k then starts surging between 1400-2000k
Trades2much is offline  
Old 04-12-2018, 03:06 AM
  #19  
travlee
Master
iTrader: (8)
 
travlee's Avatar
 
Join Date: Jul 2011
Location: Texas
Posts: 37,939
Received 5,985 Likes on 4,130 Posts
Default

i dont know why people are so opposed to just taking it to nissan for a proper diagnosis
travlee is offline  
Old 04-12-2018, 04:22 AM
  #20  
PDose
Registered User
 
Join Date: Jul 2012
Location: Virginia
Posts: 62
Received 8 Likes on 8 Posts
Default

When I had the idle surge issue it wasn't throwing any codes, wouldn't do any relearns either. Not sure what the previous owner wold of done to fry the ecu, but its a possibility to consider.
PDose is offline  

Thread Tools
Search this Thread
Quick Reply: Idle issues!!


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: