Car has issues that are driving me insane!
#1
Car has issues that are driving me insane!
I swaped my stock motor for a 408ci last oct, Ive tuned it & also had another guy help with the tune. Since day one Ive never been able to cure the idle problems, when you first start the car it will barely stay running by its self. Then it will jump around from 500rpm to 1500rpm till it warms up completely then it will stay 1000rpm, until you put it in gear then it will die or try to die. Ive meesed & adjusted every table I know to adjust & I just cant seem to get it to run on its on. Ive messed with the RAF table, timing, PE table, VE table, Cranking VE, and the throttle cracker table. Its a real PITA when your trying to go somewhere, or just drive it & it doesnt want to idle or stay running. I can put it in gear after it warms up & then the RPM jump around starts again till it either dies or I give it gas to keep it running. Its getting old quick. Any suggestions?
Now on to the other problem, This happens about every other time I drive it. I can drive 30-40mi or so then park go in or etc come back out start the car, it will start its idle deal for a few mins, then I go to take off & it feels like its running on 3 cylinders. It just bogs down, then acts like its out of gas. I can keep pressing the gas pedal but nothing happens, it will then just die. Turn the key off then back on & its fine. Ive checked all grounds & etc, but this just started recently since Ive been messing with the tune. Ive even put the very first dyno tune back in it & it will do the same thing. Its kinda acts like its loading up then just dieing. Any clues on this? I havent adjusted anything for this due to the fact I have no clue whats causing it. Ive been stumped for the past 2-3 months & Im reaching the breaking point of giving up & swapping back to a stock H/C motor. I do realize that it will never run like stock again, but I know it can get close. The guy that used to help me no longer messes with cars anymore, so Im SOL there. I can email my tune if anyone wants to take a look or make some changes Im game to try a new tune because this one isnt working.
Thanks in advance!
Now on to the other problem, This happens about every other time I drive it. I can drive 30-40mi or so then park go in or etc come back out start the car, it will start its idle deal for a few mins, then I go to take off & it feels like its running on 3 cylinders. It just bogs down, then acts like its out of gas. I can keep pressing the gas pedal but nothing happens, it will then just die. Turn the key off then back on & its fine. Ive checked all grounds & etc, but this just started recently since Ive been messing with the tune. Ive even put the very first dyno tune back in it & it will do the same thing. Its kinda acts like its loading up then just dieing. Any clues on this? I havent adjusted anything for this due to the fact I have no clue whats causing it. Ive been stumped for the past 2-3 months & Im reaching the breaking point of giving up & swapping back to a stock H/C motor. I do realize that it will never run like stock again, but I know it can get close. The guy that used to help me no longer messes with cars anymore, so Im SOL there. I can email my tune if anyone wants to take a look or make some changes Im game to try a new tune because this one isnt working.
Thanks in advance!
#5
Originally Posted by ringram
Yeah check the basics, plugs, wires, vac leak etc as well.
Does it log any codes?
As ZL1Killa says, does desired flow match actual flow at idle?
Does it log any codes?
As ZL1Killa says, does desired flow match actual flow at idle?
#6
TECH Fanatic
iTrader: (6)
Join Date: Jan 2002
Location: Springfield, IL
Posts: 1,194
Likes: 0
Received 0 Likes
on
0 Posts
Can you send me your updated bin again? I saw about 2-3 things in your old file that might be giving you issues.
One of which was wierd was the file size of your bin... They're like ~460kb instead of 512 like all the others.
One of which was wierd was the file size of your bin... They're like ~460kb instead of 512 like all the others.
Trending Topics
#9
Thanks for all the offers guys, I really do appreciate all the help I can get right now. I will get the tune to all of you who have PM'd sometime this afternoon.
SMOKIN- Could the file size difference be because they are now HPT files instead of BIN? I thinkg that may be why they are small.
SMOKIN- Could the file size difference be because they are now HPT files instead of BIN? I thinkg that may be why they are small.
#10
TECH Fanatic
iTrader: (6)
Join Date: Jan 2002
Location: Springfield, IL
Posts: 1,194
Likes: 0
Received 0 Likes
on
0 Posts
I don't believe that would effect the file size, but I could be wrong. If they come straight from your PCM and there's no hex editing going on, I doubt there's anything to be too concerned about.
#12
TECH Fanatic
Join Date: Aug 2005
Location: Sunny London, UK
Posts: 1,690
Likes: 0
Received 0 Likes
on
0 Posts
Some other dudes with fast90's have issues with leaks etc. Not saying thats the case, but if you have the time and inclination you could try the ls6/tb on there again.
#14
Originally Posted by Full-Force
he has a bigger file because he has more cubic inches
Im pretty sure I dont have anyother vaccum leaks, before when I had one my LTFT's would stay maxed out at 25 so I knew it was leaking somewhere then. But now Ive checked everywhere. & the LTFT's stay pretty low so I wouldnt think theres a vaccum leak.
Id put the LS6/stock TB back on, but Ive sold it already.
#15
TECH Resident
iTrader: (17)
Join Date: Sep 2004
Location: NC - Charlotte area
Posts: 3,747
Likes: 0
Received 0 Likes
on
0 Posts
i wouldnt' worry about re-installing the ls6 and stock TB
as long as you installed all the FAST stuff and TB right then its fine. if you are going to do anything for leaks, i would order new intake seals, and a new TB seal. But i feel that is unnecessary....let the guys try and look at your tune(s) and log(s) and see what they can come up with
as long as you installed all the FAST stuff and TB right then its fine. if you are going to do anything for leaks, i would order new intake seals, and a new TB seal. But i feel that is unnecessary....let the guys try and look at your tune(s) and log(s) and see what they can come up with