yelo04goat

iTrader: (11)

need some ideas on where this issue is coming form.

2004 GTO forged 347 78mm turbo 4l80 9.6:1 compression 230ish cam 3400ish stall.

in park the car free revs fine, snappy response idles and revs fine. even when snapinging the throttle open and closed quickly..

once it is put in gear the idle gets rougher, and if there is any load it will break up and show lean on AFR guage. something new is the gas pedal feels like it is pushing back when it does it. its cable not electronic.

im at a loss where to look. new crank and cam sensors along with 3 bar MAP sensor.

not sure what else to say need any more info just tell me here is a copy of the current tune and a basic log I need to set up new configs still ..

any help will be accepted!!
21sep_1.hpl

21sep_91base.hpt

denmah

iTrader: (2)

only thing i see thats interesting is p0016 is disabled, crank position code?

other than that i dont have much experience with that year ECU and upgrade

pwrtrip75

iTrader: (8)

Spark plugs? What kind? Part number? and what do they look like?

yelo04goat

iTrader: (11)

Ngk bre7 .026 gap. Were brand new when put in. Looked fine when i had them out maybe hour total run time on them if that

Sickness7

Check if all the spark plug wires are fully on. This used to happen to me.

dmaxvaz

iTrader: (1)

Gap them to like .017 and see what happens.

yelo04goat

iTrader: (11)

that seems tight.. I mean its not even getting to boost could that really be the problem?

ghost-1

iTrader: (4)

Ohm plug wires had the same issue like 5 plug wires were in the 500+ range and should have beeen in the 40 low 50 range.

dmaxvaz

iTrader: (1)

Works for me even at 20 psi boost.

oscs

iTrader: (19)

My stock spark plug wires where over 900 ohms. Pull a few and check

yelo04goat

iTrader: (11)

Well i know they are gunna be high the are autozone wires. I have to use longer wires. I need to buy some better wires i know. I didnt think it would be an issue just to get running

Wicked69

My vote is the wires. Get some used stock ones you know aren't burnt and just try them and see what happens.

oscs

iTrader: (19)

You know what is much easier to find than a set of known good used spark plug wires? One of these. Test your wires before you spend a dime on another set

yelo04goat

iTrader: (11)

i have to use LT wires the way we built the hot side on the driver side. so ill have to hunt down some good one.

Ryans99ls1

iTrader: (16)

Hows your voltage on the car? My car was pretty low on voltage (9-10v) and it really messed with my injectors. it was fine driving around but as soon as it transitioned into boost, it broke up really bad.

wild1100

iTrader: (3)

Had same issue. Wait till night time with hood up have someone sit in seat footbrake dont break tires loose just load car. Watch plug wires there will be a arch some where. I run same plugs .35 gap. Ohmed wires still had issue. Then was told to wait till dark have wife footbrake car and sure enough only under load I had 1 arch off header. Headers were wrapped to amazing.

oscs

iTrader: (19)

Great info. I would have never thought of that.

yelo04goat

iTrader: (11)

I will have to try that..

69-chvl

iTrader: (11)

If you do it on a rainy/damp day or maybe even spray a mist on the engine you can really see an arc.

Hank Peabody

iTrader: (2)

Spray some starting fluid in there for a fireworks show!