So I still have the P0140 staying on center problem and its pissing me off. I emailed hughes and they didn't know, I've checked lines and fittings and they seem to be fine. I had a leaking injector so I replaced all o-rings in them, Replaced 02 sensors and checked cat. Still nothing I'm confused and getting pissed Anyone have this problem?

 

P1040 ?

 

My bad typo P0140

 

I don't think it has anything to do with Hughes. Have you traced the wires from the o2 to the pcm? Make sure all the grounds are hooked up to motor too. Have you tried the non fouler trick?

 

ive heard of some people getting codes on the engine of being to cold with the 180 tstat, people that switched back to 190 said it ran way better on the airgap

 

You know what Zman I think ur on to something When My buddy and I put the ground back on behind the valve cover we moved it for easy assemble purpose and thats probably throwing a glitch in the system.

 

I think there are 2 ground wires on that side.


SYMPTOM
P0140-1/2 O2 SENSOR STAYS AT CENTER

TEST NOTE
This symptom is diagnosed using the test P0134-1/1 O2 SENSOR STAYS AT CENTER.

WHEN MONITORED
Engine running for greater than 121 second . Coolant Temperature greater than66°C (150.8°F) . Engine in closed loop fuel control mode. Vehicle Speed greater than 40 MPH .

SET CONDITION
O2 signal voltage is between 0.35 volt and 0.58 volt for a total of 30 seconds and then O2 signal volt is 1.5 volts for 60 seconds . Two trip fault.

POSSIBLE CAUSES

* Intermittent condition
* O2 sensor operation
* O2 sensor ground circuit open
* O2 sensor signal open
* O2 sensor ground circuit voltage drop
* O2 sensor signal circuit voltage drop
* PCM

 

My only problem is that I can clear it with my sct tuner and it pops right back up.

 

Obviously that's not the only problem

 

how the truck running with the code. where did you end up putting the sensor that was in the old manifold ? and how does your coolent temp sensor look? mine was all corroded and i bought a new one too be on the safe side. maybe its not reading a proper temp?