Thread: Just bought HPT and would like some suggestions to help me fix my idle

I had my car tuned by a "pro" but cant seem to get the idle right I was wondering if I post a screen shot of the settings someone could take a look and point me in the right direction.. As of now I dont plan to change anything other than that and take 1* of timing away, I have a lot of reading and learning ahead of me..

Get on the HPT forums aswell if you can.

Posting your file or scan on there is easy, you can get feedack from there aswell.


Whats wrong with your idle though?

Just read your build page. Ensure your tune has the proper data for your 60lb injectors that may be your issue for the idle

http://www.3800pro.com/forum/pcms-tu...r-scaling.html

once I get it tomorrow Ill upload the file and try to get a 30 minute log to post.

Originally Posted by darkhorizon

^^Dont attempt to adjust offsets. They dont work on 3800 pcms.

Why would you not want the proper injector data since the op upgraded?

I also have more than idle issues.

-flat spots
-KR at shift points
-random 4* of KR after 100mph
-lean conditions at cruise (65ish MPH) 17.0+ AFR
-goes lean around 25mph to the point it starves for fuel and stalls I monitor with the AEM UEGO when this happen the gauge just reads - - - no numbers

Originally Posted by acidcrashdburnd

I also have more than idle issues.

-flat spots
-KR at shift points
-random 4* of KR after 100mph
-lean conditions at cruise (65ish MPH) 17.0+ AFR
-goes lean around 25mph to the point it starves for fuel and stalls I monitor with the AEM UEGO when this happen the gauge just reads - - - no numbers

Post the tune file use something like Google docs or cloud to up load it

Originally Posted by 91parkave

Post the tune file use something like Google docs or cloud to up load it

I will have it up tomorrow, thanks.

Originally Posted by darkhorizon

all of these symptoms are mechanical, not tune related.

What could be wrong? no leaks before maf, clean maf, new o2, no exhaust leaks.

It just occurred to me that I am running a stock pump with stock wiring. I will hook a gauge up to the car and do a few WOT runs friday night and see what I get; I would also like to tap in to the wiring if i can and monitor voltage for spikes and drops.
Darkhorizon might be right.

Originally Posted by acidcrashdburnd

It just occurred to me that I am running a stock pump with stock wiring. I will hook a gauge up to the car and do a few WOT runs friday night and see what I get; I would also like to tap in to the wiring if i can and monitor voltage for spikes and drops.
Darkhorizon might be right.

60 pound injectors with no pump upgrade? I assumed you took care of that....don't even bother at least rewire your fuel pump and order a 255lph pump

I am looking for a pump on the intense racing web site and found this,

INTENSE Racing: Walbro 255lph Fuel Pump

I cant find a pump listed for 04+

https://www.dropbox.com/s/uxgb0ahhe0axcog/POWERHAUS.hpt

there is the link to my tune.

I need to do a rewire on mine. I have one in the garage just haven't had anytime to do it. I don't have a problem with leaning out though.

Found one problem quickly, you are commanding 11.7 AFR, yet still having the ADD vs RPM table active. So its adding more and more and more fuel as the time goes on. If you are seeing 10 AFR I wouldnt be suprised.

First thing I adjusted, was adding 50rpms to the AC on field

I am using this http://www.grandprixforums.net/hptun...ies-43620.html

But I think its out dated.. I cant find some of the things mentioned.

Originally Posted by Fivefingerdeathpunch

Found one problem quickly, you are commanding 11.7 AFR, yet still having the ADD vs RPM table active. So its adding more and more and more fuel as the time goes on. If you are seeing 10 AFR I wouldnt be suprised.

Which view can I see this in?