| Welcome to DSMtuners |
You are currently browsing the site as a "Guest", which means your are either not registered or not logged in. This also means you have limited access to our site and cannot participate - you also are browsing the site with more advertisements than logged-in members.
Register an account and start participating!
|
| Newbie Forum: Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum. Probationary Members must limit their tech posts to this forum and sub-forums. |
 |
|
|
06-10-2012, 02:02 AM
|
 Show Printable Version
 Email this Post
#1 (permalink)
|
|
Proven Member
From: Inland Empire, California
Registered: Oct 2011
Reputation: 
|
Bad idle, stutter/stumble on boost, close to stumped
I figured I'd post this in the newbie section since I feel like a newbie right now.. I've been slowly working out all the kinks on my car, but I'm just about out of ideas with this deal. I've narrowed it down to it only happening during closed loop - warm idle and part throttle acceleration/cruising.
New O2 sensor, known perfect MAF, fresh ECU from ECMTuning, new coolant temp sensor, ISC tests good, haven't been able to catch it acting up on a log yet. These are the ideas I'm down to - when I bought the car I had to replace the O2 housing and don't remember messing with gaskets (didn't know better at the time) so possible exhaust leak screwing the O2 sensor reading? Or, unrelated, possible fuel pressure solenoid acting up/not working properly, affecting fuel pressure?
When it acts up it smells incredibly rich so I'm fairly confident it's something between air being metered and the ECU's response to that, but the components themselves are known good so there must be something affecting their operation. Anybody help point me in the right direction, or suggestions of something I'm overlooking?
Mod list is up to date. Thanks!
____________________________
-Ryan
6/4 GSX 16G@21psi on 91
|
|
|
|
|
06-10-2012, 03:40 AM
|
Show Printable Version
Email this Post
#2 (permalink)
|
|
Supporting Member
From: On a Jet Plane, Illinois
Registered: Feb 2008
|
What MAF sensor are you running? Stock? 2g? GM? You may have to run a MAFCompAdj. with DSMlink, if its anything other than stock. Witht he GM ones, you may find yourself manually adjusting it at the higher RPM range, as well.
____________________________
1995 Eagle Talon Kona Blue TSi AWD
|
|
|
|
06-10-2012, 10:13 AM
|
Show Printable Version
Email this Post
#3 (permalink)
|
|
Proven Member
From: Inland Empire, California
Registered: Oct 2011
Reputation:
|
Stock 1g MAF, pulled from a known running car with perfect idle. Properly "hacked" with only the lower honeycomb removed.
____________________________
-Ryan
6/4 GSX 16G@21psi on 91
|
|
|
|
|
06-10-2012, 10:46 AM
|
Show Printable Version
Email this Post
#5 (permalink)
|
|
Proven Member
From: Inland Empire, California
Registered: Oct 2011
Reputation:
|
Quote:
Originally Posted by My1GLaser
Post a log!
|
As soon as I can catch it acting up on a log! I don't have Link (yet) so I could either post the TunerPro file or a screenshot of it..
____________________________
-Ryan
6/4 GSX 16G@21psi on 91
|
|
|
|
|
06-10-2012, 05:06 PM
|
Show Printable Version
Email this Post
#7 (permalink)
|
|
Proven Member
From: Inland Empire, California
Registered: Oct 2011
Reputation:
|
Quote:
Originally Posted by My1GLaser
What plugs & gap are you running? How old?
|
BR7ES (non-protruded insulator) gapped at. 028 brand spanking new, literally 2 days old. The issue is only during closed loop, if I hit WOT she runs perfect! And cold idle is fine too, only fully warmed idle and part throttle conditions.
____________________________
-Ryan
6/4 GSX 16G@21psi on 91
|
|
|
|
|
06-10-2012, 05:12 PM
|
Show Printable Version
Email this Post
#8 (permalink)
|
|
Proven Member
From: G-gity, Ohio
Registered: Nov 2007
Reputation:
|
Sounds like a TPS issue. Did you happen to move the sensor, throttle cable, or didn't recalibrate it period?
|
|
|
|
|
06-10-2012, 05:37 PM
|
Show Printable Version
Email this Post
#9 (permalink)
|
|
Proven Member
From: Inland Empire, California
Registered: Oct 2011
Reputation:
|
Quote:
Originally Posted by rEclipserGST
Sounds like a TPS issue. Did you happen to move the sensor, throttle cable, or didn't recalibrate it period?
|
I did adjust the throttle cable for slack a while back, made sure I left a little bit though. TunerPro logs perfect 10.20% at idle and I've tested the sensor with a DMM so I'm fairly confident it's not that.
____________________________
-Ryan
6/4 GSX 16G@21psi on 91
|
|
|
|
|
06-10-2012, 05:41 PM
|
Show Printable Version
Email this Post
#10 (permalink)
|
|
Proven Member
From: G-gity, Ohio
Registered: Nov 2007
Reputation:
|
Quote:
Originally Posted by Spoolin92GSX
I did adjust the throttle cable for slack a while back, made sure I left a little bit though. TunerPro logs perfect 10.20% at idle and I've tested the sensor with a DMM so I'm fairly confident it's not that.
|
Should be 0% at idle.
|
|
|
|
|
06-10-2012, 06:05 PM
|
Show Printable Version
Email this Post
#11 (permalink)
|
|
Proven Member
From: Inland Empire, California
Registered: Oct 2011
Reputation:
|
Quote:
Originally Posted by rEclipserGST
Should be 0% at idle.
|
Hmm. And that would affect part throttle driving too wouldn't it?
____________________________
-Ryan
6/4 GSX 16G@21psi on 91
|
|
|
|
|
06-10-2012, 06:44 PM
|
Show Printable Version
Email this Post
#13 (permalink)
|
|
Proven Member
From: G-gity, Ohio
Registered: Nov 2007
Reputation:
|
Quote:
Originally Posted by Spoolin92GSX
Hmm. And that would affect part throttle driving too wouldn't it?
|
Yes sir. It'll make deceleration unsubtle. Wideband should be affecting by this as well when you let off the throttle.
|
|
|
|
|
06-10-2012, 06:58 PM
|
Show Printable Version
Email this Post
#14 (permalink)
|
|
Proven Member
From: Inland Empire, California
Registered: Oct 2011
Reputation:
|
I'll double check the TPS volts.. Wideband is getting installed in a week or two, whenever the damn thing gets delivered..
____________________________
-Ryan
6/4 GSX 16G@21psi on 91
|
|
|
|
|
|
|
» Recent DSM Videos |
|
|
» Online Users: 934 |
| 349 members and 585 guests |
| Most users ever online was 1,704, 03-17-2008 at 09:11 PM. |
|
|
|
|
|
