Well as the story goes I have had this car for a little bit now.... after a month of solid performance I was driving out of boost and it all of a sudden started to stutter and eventually would no longer drive. It will idle however very shittily and wont drive unless I fluttler the gas.

Setup:
stock B18a long block
Precision sc60 turbo
DSM blue tops w/ resistor box
Tuned on Crome by Xenocron

Issue:
Car will start and wont hold idle until warmed up
When you press in the gas it will bog, however when you release the gas it will rev up
If gas is held at a constant RPM it will die out completely

Already done:
New MAP sensor
New ECU
New Chip (same tune just reburned chip)

Other things...


The wiring is f'd to holy hell but i have changed nothing from when the car was running to when it stopped. It doesnt throw a CEL however today when i was messin with it it threw a cel. When i went to jump it it wouldnt show back up....


Here is a quick vid of what I am talking about...

http://www.makingapril.com/greg/Eric/ls.mpg

 

make sure your map sensor and or tps are pluged in

are you throwing any codes?

 

map sensor definately plugged in and if I am throwing a code i cant check it becuase as soon as it throws and i go to turn the car off and back on again with the jumper it disappears.

 

change your spark plugs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Running925 &raquo;</TD></TR><TR><TD CLASS="quote">change your spark plugs.</TD></TR></TABLE>


fo real......it could be something stupid like that

 

Start with mechanical first. Compression test, check timing, and check spark to all 4 plugs. Go electrical next. Good luck, we all know we hate demons like these. You'll figure it out though just takes a little time and patience

 

spark to all 4 plugs... all plugs look good. cap and rotor a-ok....there are some odds and ends wiring wise that i should def clean up but they didnt change from when it was running to when it started doing this...

 

Fuel cutoff is causing your car to run as the throttle closes. On the other hand, when the throttle opens, she revs up a bit, but as soon as the injectors start pumping, you are bogging out. Check your tps and map sensor. If you haven't programmed in your new map sensor, the computer will be reading a far lower pressure reading, which could explain the fuel cut.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StreetEG &raquo;</TD></TR><TR><TD CLASS="quote">map sensor definately plugged in and if I am throwing a code i cant check it becuase as soon as it throws and i go to turn the car off and back on again with the jumper it disappears.</TD></TR></TABLE>
you can leave the jumper in and the code will still flash with the car running (at least mine always did)....if i read that right, and thats what you were saying.

 

make sure the map sensor and tps sensor plugs arent switched. I've seen this before. When you rev it the map signal shoots way up dumping in fuel and causing the car to bog and shut off or almost shut off.

 

check the voltage to the fuel pump. if you say that all of those things are right, and the map signal seems correct...then work backwards mechanically. Check the pump voltage, check the pump, nxt, check injector clips and wiring, and then check injectors.