Join Date: Aug 2011
Location: Fowlerville, MI
Little update. I removed the resistors from the throttle position sensor. Found out I had two cracked ignition coils and they all corroded up inside(what you miss when you let a friend change your plugs). I cleaned in another old set and swapped them in. After that, the modified tps signal seemed like it was hurting me. Took it out, reset the computer, and it's driving like a new car again. Tons of power and easily spins a bit taking off. Now the map sensor mod is a trade off. When it's on(set to 5.25v), its a huge difference with torque steer noticeable. It accelerates much faster, but it's at the cost of economy. I will play with it more once I get another good baseline mileage.
Before the coils being replaced, I averaged 26-27mpg over 1,300 miles. I haven't been able to check again since. I never smell raw gas anymore or see a lot of smoke out the exhaust when I stop anymore. I'm hoping its going to be 1-2mpg more. This is still at very cold temps with warmups and me driving spirited at times.
Another note, I switched oil. Used a gallon of shell t6 5w-40 and two quarts of g-oil 5w-30. I actually noticed a difference. My engine seems to have better crankcase vacuum as it now whistles, and it's louder when it's cold. My #4 cylinder was consuming oil. A few hundred miles later, no more oil in the cylinder. Could this oil make that much difference on ring seal?
And yes, my engine takes 6 quarts of oil. Actually 6.5 but its a pain to drain the oil cooler I installed.