vorsprung

Car fires right up. But is puffing out more smoke than a 2-stroke dirt bike. Thought it was just oil from sitting so long but it hasn't cleared up at all. It's also idling super low 5-650rpm and running it through the idle learn procedure doesn't seem to improve the idle at all.

Quick idle clip:

Compression test didn't seem too concerning, and the car still always starts easily.

I've researched and I think I've already hit the common suggestions: checked for vacuum leaks, MAP sensor is connected, checked that the IAC opens and shuts(tested with a 9V battery), adjusted the TPS to within spec.

At this point I'm kind of stumped Tomorrow I might pull the stock ECU out of storage and try running the car with that?



Some background:

Mods: Intake, Catless downpipe, resonated mid-pipe, cat-back exhaust, power fc.
Deleted air pump(this was removed before I bought the car), egr, aws, double throttle, acv
New(used) turbos and engine harness

Owned the car for a year and a half, never smoked at idle or on start up. According to the records that came with the car the motor is a Pettit build done 9 yrs ago but only ~15k miles ago.

So I started tearing into my car late winter. Original plan was to perform a simplified sequential, power fc, and a wideband install. It became a lot more as I started pulling parts.

Long story short, compressor wheel of my rear turbo was chewed up so I bought a good condition set off the forums here.

The main engine harness was a mess, broken connectors siliconed into injectors etc. So bought a used harness, and it came "setup for sequential" It was missing connectors for the OMP and the OEM fuel pressure solenoid so I spliced in the connectors from my own harness.

At this point I tackled the simplified sequential job and swapped out my main cat for a resonated mid-pipe(car already had the pre-cat eliminated) and swapped to the Power FC.

DaleClark

iTrader: (55)

First thing to check is ignition. Make sure the plug wires are on right, coil pack harness is correct and happy, etc. Also worth checking the crank angle sensor plugs, make sure they aren't swapped and they are plugged in properly and happy.

Have you been through the sensor check screen on the PFC to make sure voltages and values for the main input sensors are happy?

Sounds like a lot of the car's systems were touched so unfortunately you do have a good amount to dig through. Just be methodical with each system, you already made sure you have good compression so you're off to a good start. Next is spark then fuel.

For fuel, I'd get noid lights or something to make sure you're getting good signals to the primary injectors.

Have you checked plugs to see if one rotor is not firing?

Dale

K-Tune

iTrader: (26)

Check map sensor vacuum hose...

arghx

iTrader: (3)

For the smoking concern, did you accidentally plug the crankcase ventilation on the oil filler?
Did you check for shaft play on the turbos?

do you have a datalogit? Also, did you port the wastegate? You don't want to go catless without a ported wastegate

vorsprung

Thanks for the detailed response Dale. Sensors on the PFC are all within range (they would be highlighted otherwise, correct?)

Pulled the plugs late last night and both trailing plugs were covered in oil/fuel. I did have the coil harness and crank sensors de-pinned to redo them with heat shrink. I was pretty meticulous in labeling the connectors but I'll start with triple checking those tonight.

One of the first things I checked.

Checked the crankcase vent and it's not plugged.
Turbos were in good shape.
Unfortunately no datalogit yet.
I'll port the wastegate if needed.

arghx

iTrader: (3)

It's needed. If you don't put a cat/restricter back in now (obviously you have to troubleshoot these problems as well) you will damage the engine from overboost, or you will get to tuning and be unable to control boost, and end up retuning it anyway once you port the wastegate or open the exhaust.

jza80

iTrader: (32)

Any chance the PCV valve is installed backwards? That could really affect idle quality.

K-Tune

iTrader: (26)

Your pfc map reading is showing atmosphere pressure, even though your vac gauge is showing around 10 inches. Something isnt right there, which is why i said to check that hose.

vorsprung

Good catch. Maybe the filter in that line is clogged. I'll check that next.
Just finished checking the coil harness and crank sensor wiring, both pinned out fine.

DaleClark

iTrader: (55)

Also that filter needs to be a filter, if it's a check valve it won't work.

I've also seen the map sensor hose going to a stud or something instead of the vacuum nipple. Regardless that should be a quick and easy thing to test and check. If the PFC isn't seeing the signal and it's not seeing vacuum that's a HUGE problem, that's half of it right there.

Kurt (k-tune) for the win!

Dale