Wot hesitation & stall

[Jerryl]

Yeah, was thinking PL. lv8

 

[NorCalTurbos]

FP should be set at 43 psi, line off. try that, reset ecm, and see what happens.

Fp was low I'm resetting the ECM now how should I set the translator right now it's set for my ls1 maf 0 base and 0 wot it smells like unburned fuel a lil at idle

 

[NorCalTurbos]

On my scan master, Load is l8, not lv

Mine shows l8

 

[NorCalTurbos]

All sensors and vac line suspected and new egr and waist gate cylinoid are the only things I haven't touched yet fp at 43 line off and rises with boost

 

[buddy]

Try disconnecting translator and start it see what numbers are.

 

[NorCalTurbos]

Great question.
Here is my understanding.

The ecm adusted the fuel needs at idle since idle blm is up. There is not a big load at idle (LV) so it will tollerate running lean. Once the engine sees a load it needs more fuel. Since the ecm has not yet self adjusted off idle blm, the lean mixture can cause a stutter and misfire. With the 5.7 chip, the AF will also max at 255 and the ecm does not know ot care how much fuel is needed. The DC is prograamed in the chip based on what TT was told. BUT, it assumes the fp is set to the spec. . . . . . Makes sense?

Edit. buddy beat me to it. Lol

this exactly what the car is doing now to figure out how to stop it

 

[Jerryl]

Mine shows l8

Not a big deal. We are all talking about the same thing . . . Load Variable 8 bit or LV8. With only 2 digits to display the variable on SM and inability to show the V, L8 it is. lol

 

[NorCalTurbos]

Try disconnecting translator and start it see what numbers are.

I just reset the ECM should I let it relearn first or disconnect it now

 

[buddy]

I don't think it would matter but maybe Jerry can chime in on that.

 

[NorCalTurbos]

Also what should l8 be when in gear foot on break or cruising???

 

[buddy]

Also what should l8 be when in gear foot on break or cruising???

I remember reading rhat the l8 load numbers are just calculated estimates from sensors and aren't really useful for diagnosing or tuning.

 

[Jerryl]

The idle rpm, AF and L8 all looked ok. . . . . Based on that I would screw the throttle stop screw out about 1/4 turn, start/drive and let the ecm relearn. Yes, TPS will drop a bit but it will still be ok.
One thing to add . . . . I would not go wot untill things are lined up.

 

[NorCalTurbos]

Scan tool shows
O2 117-160
Af 06
L8 39
Int 128
Bl 142
Ats 71
Rpm 800-87
Tps .42
Iac 00
Cc 06

 

[NorCalTurbos]

I think I got it today I found vac leaks all around the intake, waste gate and egr... Turbo is coming off intake coming out for further inspection and gasket replacement thanks for all the feedback I'm pretty sure it's vac related because in gear under heavier load the cold air kit starts to whistle the brakes get stiff I think it's soo bad it's causing the car to misfire at idle and cruise which explains the erratic shaking and fuel smell

 

[NorCalTurbos]

Btw I did the carb cleaner trick and idle changed as I kept spraying my build is now a tear down

 

[NorCalTurbos]

Pulled it all apart yesterday and found the intake had been "ghetto ported" looked like the used a chisel lol! Good thing I have an extra sitting on the shelf untouched. This explains a lot, I'll post updates once i round up all the gaskets and get it back together