I've got this new engine together and it's ran about 4 hours and maybe 100 miles. Then, the other night, I was driving along 30 MPH, cruising home. The car started to run rough, sputtery, and with little power. My WB O2 sensor went from a nice closed loop A/F ratio of mid 14's reading to 15-18. I happened to be datalogging with the tweecer at the time and had the laptop on and monitoring. LAMBSE followed the lean reading NB O2's and went to 10-12ish. I thought it may have been my stock O2's freaking out (as I've had issues with them, too) so I switched the tune over to a full time open loop setup. I just happened to have that programmed into the tweecer. Didn't help. Still rough and the WB was still at 15-16ish (sometimes to 18) even though LAMBSE was at 13-14. I've ran the car before in full time open loop so I know that the actual A/F ratio will follow LAMBSE pretty well.
The car is also hard to start, and idles like crap now. I pulled the side of the edel. performer's upper intake and seen the light brown oil we all dread (see pic). I drained the oil and it actually looks pretty good, but you can just tell that there is some coolant in there, but it is still dark brown. I was able to drain out about 4 quarts, so there is not excessive coolant in there. I'm guessing that it is a upper intake gasket leaking coolant into the lifter valley and getting sucked up into the intake making the oil in the intake look very white, since it is so concentrated right near the PCV valve.
It also seems that I have a vac leak since I'm running lean. It seems that both banks are lean, as the WB is in the pass bank, and the drivers bank NB O2 sensor was stuck dead lean while driving it that way. Usually it's dead rich while in open loop. So it seems that both banks are getting excess air. What does this mean (as to what my problem is)?
Does this seem like common symptoms to either a intake or head gasket leak? I've been mainly gentle with the car since it has a new motor, and the motor has never been over 4000 RPMs (due to tweecer).
Thanks,
Rick
The car is also hard to start, and idles like crap now. I pulled the side of the edel. performer's upper intake and seen the light brown oil we all dread (see pic). I drained the oil and it actually looks pretty good, but you can just tell that there is some coolant in there, but it is still dark brown. I was able to drain out about 4 quarts, so there is not excessive coolant in there. I'm guessing that it is a upper intake gasket leaking coolant into the lifter valley and getting sucked up into the intake making the oil in the intake look very white, since it is so concentrated right near the PCV valve.
It also seems that I have a vac leak since I'm running lean. It seems that both banks are lean, as the WB is in the pass bank, and the drivers bank NB O2 sensor was stuck dead lean while driving it that way. Usually it's dead rich while in open loop. So it seems that both banks are getting excess air. What does this mean (as to what my problem is)?
Does this seem like common symptoms to either a intake or head gasket leak? I've been mainly gentle with the car since it has a new motor, and the motor has never been over 4000 RPMs (due to tweecer).
Thanks,
Rick