running pig rich

[milrite007]

I need ideas.I have run out of things to check. Pig rich all through it. I have done: Compression test, leak down test, ISC check, TPS check, I have done every check that I can find on 3 forums. I sprayed starter fluid everywhere and no change. The first log shows where as I push the pedal it gets nutty about 1100-1200 rpm. When I run a longer idle log and do a SD VE adjust it will put like 39 to 42 in the cell that its using at idle. If I do that it goes off the chart lean?

 

[Maverick4g63]

How about your water temp sensor that is mounted to your thermostat housing? A sensor that fails at say, -100 deg will cause your ECU to desperately attempt to raise the water temp by dumping extra fuel. There is an ohm chart floating around here somewhere that allows you to check for correct functioning of your water temp sensor.

 

[milrite007]

How about your water temp sensor that is mounted to your thermostat housing? A sensor that fails at say, -100 deg will cause your ECU to desperately attempt to raise the water temp by dumping extra fuel. There is an ohm chart floating around here somewhere that allows you to check for correct functioning of your water temp sensor.

Thanks I'll check it!

 

[Diamond Star Werks]

The coolant temp shoulda been one of the first things to check. (Engine Coolant Temperature Sensor Resistance
At 68° F (20° C) .................................................... 2.5K Ohms
At 176° F (80° C) .................................................... 300 Ohms)
Also check to make sure your not getting any phantom knock as the ecu compensates for knock by adding extra petro. So check your knock sensor too. And just make sure you tested everything correctly and didn't miss anything. Here are some more tables.

Throttle Position Sensor Adjustment Voltage
At Curb Idle .............................................. 0.48 - 0.52 Volts

Throttle Position Sensor Resistance
Varies between ............................................. 3.5K - 6.5K Ohms

Intake Air Temperature Sensor Resistance
At 68° F (20° C) .................................................... 2.7K Ohms
At 176° F (80° C) .................................................... 300 Ohms
Fuel Pressure Control Solenoid Valve Resistance [4]
At 68° F (20° C) ................................................. 36 - 44 Ohms

Fuel Injector Coil Resistance [4]
At 68° F (20° C) ................................................... 2 - 3 Ohms

Idle Speed Control Servo Resistance
At 68° F (20° C) ................................................. 28 - 33 Ohms

 

[milrite007]

The coolant temp shoulda been one of the first things to check. (Engine Coolant Temperature Sensor Resistance
At 68° F (20° C) .................................................... 2.5K Ohms
At 176° F (80° C) .................................................... 300 Ohms)

First thing I check is vac leaks. Also I'm logging coolant temp in link and it seems fine on there.

 

[Diamond Star Werks]

So your saying at first it runs rich but if you let it idle longer it goes off way lean? or it goes lean running at 1100-1200?

 

[DeadlyScone]

maybe it's your O2 sensor. I was reviewing all your idle logs and it looks to me like your O2 is not cycling properly. Just a thought though