Blown Interceptor

iTrader: (5)

Where do I begin?

I just added a ported throttle body. Started the car and WHAM, idle went to 2k and stayed three for about 10 seconds. Kinda freaked me out!


Start driving, put it in 2nd gear, give a bit of throttle, then WHAM, reduced engine power and car stalls. Try it again, same thing.

Pulled code P1514


Any help would be GREATLY appricated!

Thanks,
Jason

WS6 GreeN

Is it just a stock ported TB?

Blown Interceptor

iTrader: (5)

Yeah, it's stock ported.

Sabre002

iTrader: (7)

Did they port the little idle air hole.

Blown Interceptor

iTrader: (5)

Not sure...here are pics of my stock one, and the ported one.

https://ls1tech.com/forums/generation-iii-external-engine/429302-how-good-port-job-tb.html

minesfaster

iTrader: (24)

p1514 high load neutral drive fault.

minesfaster

iTrader: (24)

did they take the electronics off the tb when they ported it ?

Blown Interceptor

iTrader: (5)

Not sure. He said they are brand new.

WS6FirebirdTA00

iTrader: (33)

looks like a poor port job to me, do you have tuning software? in the drive by wire there is a table for this code, it says for xx tps at xx rpm expect this much air (or something like that)

WS6FirebirdTA00

iTrader: (33)

here u go

jimmyblue

iTrader: (11)

Fitst off measure TPS voltage. If it "thinks" it's not
at closed throttle it's not going to use the same idle
scheme.

Next see what you can find in the nature of vacuum
leaks.

Then I would try and verify that you didn't get a bad
IAC servo on your shiny new (or old?) ported TB.

Underneath the new tricks it's still the same old dog.

Uhh... drive by wire... never mind.

WS6FirebirdTA00

iTrader: (33)

my bet is somethign wasnt put together correctly in the tb or the port was taken too far back.

Blown Interceptor

iTrader: (5)

What could not be put together right? I am going to re-flash the car now. I'm gonna raise the P1514 by 115%. I'm hoping that be take care of the reduced engine power. I also lowered the base spark by 4 degrees.

ToplessTexan

From my service manual regarding P1514...

"The PCM uses the TP, the BARO, and the IAT and the engine RPM in order to calculate an expected Mass Airflow rate. The PCM compares this value to the Mass Airflow value and the speed density calculation in order to verify the proper throttle operation."

In particular note that the TPS value factors into the expected airflow value. If your TPS values are skewed relative to actual position the expected values will be off (which is why you have to go muck with the allowed deviation table. Note that's not a fix, it's a workaround.) I remember seeing a few threads with similar stories maybe here and at CF where it ended up being a a TPS sensor.

WS6FirebirdTA00

iTrader: (33)

well if it was put together where the blade was cracked open more, im not sure i have never taken appart a drive by wire

Bink

Check the TPS. If it's okay - Functioning/installed/plugged in correctly then go to HP tuners (that's your Editor?) and Eng. Diagnostics ->TPS Sensor-> Calc Airflow - P1514/P0068 Error. Multiply the whole table by 200% - doubling the values. With bigger cams you may have to increase the values below 0.50 to 0.50 g/cyl.

Pull the PCM fuses for about 4 minutes and then do an idle relearn.
(Old idle airflow trims were probably the cause of the 2000 rpm at start.)

From gojo
Idle Rearn:

Follow these procedures EXACTLY or you will have to start from scratch.
Insert key into ignition and turn to the "On" position but, DO NOT START THE ENGINE.
Pop open the engine fuse block box cover and remove the two 10amp fuses from position numbers 16 & 23.
Your DIC will now display "check" messages for ABS, etc...
Turn ignition to the "Off" position.
Re-insert both 10amp fuses for positions 16 & 23.
Start your engine
Allow engine coolant temperature to reach a minimum of 176 degrees F and run at this minimum temperature for at least 5 minutes.
Shut down engine
Let rest for a minimum of 30 seconds.
Restart engine - check for DIC error codes (there should be none).
Drive car for a minimum of 30 miles at varying rpm settings and speeds. PCM will now re-learn and adjust for the new air flow and air temperature at the intake.

FWIW.