still trying

[tyfoo]

so far to date

plugs ur5
wires atr
cap rotor
pick up coil
ignition coil- sparking at night
o2
tps
iac
intake gasgets
lots of ether no vacume leaks
timed 0 deg
oil change
oil filter
fuel filter
compresion check 160 across
top end cleaner
supenten belt
air filter
waste gate adjustment
atr exhaust
fuel pressure 42 builds pressure 2-3 psi when shut off

still idleing rough.
start up idle goes up to 1200 after five seconds comes down starts to idle rough
very slight break up and disaperes when idle goes higher
low rpm surge
put the a/c on and it smooths out alot almost perfect.
ANY SUGESTONS?


if the piston is at the top 0 deg.
don't i want to fire the cylinder before it gets to the top on the compression stroke?

yesterday the check engine light came on a code 44 ?
I'm lost ????

 

[SYO237]

CODE 44
OXYGEN (0,) SENSOR CIRCUIT
(LEAN EXHAUST INDICATED)
4.3L TURBO (VIN Z) SYCLONE AND TYPHOON (PORT)

Circuit Description:
The ECM applies a bias voltage of approximately 450 millivolts (350-550 mV is normal bias voltage) between terminals “GE14” and “GE15” (if measured with a 10 megohm digital voltmeter, this may read as low as .32 volt). The oxygen (0,) sensor varies the voltage within a range of about 1 volt, if the exhaust is rich, down through about .10 volt, if exhaust is lean. A lean exhaust condition will cause the oxygen sensor to output a low voltage, which will pull the bias voltage from CKT 412 low. The ECM is programmed to interpret any voltage less than 500 mV as a “lean exhaust condition.” The sensor is like an open circuit and produces no voltage when it is below about 316°C (600°F). An open sensor circuit causes “Open Loop” operation. The heating element in the 02 sensor causes the sensor to heat up quickly, allowing for quicker closed loop operation.

 

[TYRODD]

ignition coil- sparking at night

? Whaddya mean?

Have you taken your injectors out and cleaned them yet? Not hard to do at all.

Good compression, at least thats outta the mind 'eh!

 

[sy538]

I thought a rough idle was normal.

 

[tyfoo]

IT WAS SPARKING AT NIGHT WERE THE FRAME OF THE COIL RAPS AROUND IT
YOU CAN SEE BURN MARKS ON IT WERE IT ARCED TO THE FRAME

WHAT DOES THE O2 MEAN?
I CHANGED IT
WHAT COULD CAUSE IT TO GO LEAN?

 

[Boosted]

Fuel pressure need adjustment?

Have you wiggled the shaft of distributer to see if a worn dist is causing misfires?

 

[GM TURBO]

IT WAS SPARKING AT NIGHT WERE THE FRAME OF THE COIL RAPS AROUND IT
YOU CAN SEE BURN MARKS ON IT WERE IT ARCED TO THE FRAME

I'd start there.

 

[tyfoo]

tps volts ?
.05 at idle?

 

[nightdiver]

IT WAS SPARKING AT NIGHT WERE THE FRAME OF THE COIL RAPS AROUND IT
YOU CAN SEE BURN MARKS ON IT WERE IT ARCED TO THE FRAME

I'd start there.

What he said