Hi All,
In my previous post I mentioned using an older style exhaust, for the 4.6 stroker I built. However, I used the banks torque tubes designed for my year and the factory exhaust so I could retain the factory locations for the O2 sensors. Unfortunately, I'm having all kinds of issues with it running right.
It starts right up, vibrates like crazy, eventually smooths out a bit, and runs enough I can drive it to work and back. (I go super easy on it.)
I don't hear any pinging or knocking, there's no CEL, it idles fine for the most part, and during acceleration it vibrates like its stumbling on itself.
I have checked and double checked the base timing and the installment of the cam sync, both are set properly. The PCM is original. I've replaced the coil pack, cam/crank sensors. Gave the wiring harness a serious manhandling listening for any signs of changes, and no difference.
I have a very basic scanner that lets me see some live stream data and I've been watching it as I drive. At idle, timing adv. ranges between 7.5 - 14 degrees, most of the time, and goes to around 34 or higher when i give it small amounts of gas. A couple of times it remained at 27 while at idle. Other times it will hit 0 when i let off the gas. The bank 1 stft (short term fuel trim), O2 numbers, are relatively numerically close to their bank 2 counterparts; I don't see any drastic differences, and the numbers are pretty low both in both pos and neg ranges. That said, I have never looked at the live data before so I have no idea what's normal and what's not.
I'm looking for someone who knows what the numbers should be, and would be willing/ able to help determine/diagnose the issue(s). I cant find anyone where I live who can do this. I am more than willing to pay for the services.
Much appreciate any help/advice.
R
In my previous post I mentioned using an older style exhaust, for the 4.6 stroker I built. However, I used the banks torque tubes designed for my year and the factory exhaust so I could retain the factory locations for the O2 sensors. Unfortunately, I'm having all kinds of issues with it running right.
It starts right up, vibrates like crazy, eventually smooths out a bit, and runs enough I can drive it to work and back. (I go super easy on it.)
I don't hear any pinging or knocking, there's no CEL, it idles fine for the most part, and during acceleration it vibrates like its stumbling on itself.
I have checked and double checked the base timing and the installment of the cam sync, both are set properly. The PCM is original. I've replaced the coil pack, cam/crank sensors. Gave the wiring harness a serious manhandling listening for any signs of changes, and no difference.
I have a very basic scanner that lets me see some live stream data and I've been watching it as I drive. At idle, timing adv. ranges between 7.5 - 14 degrees, most of the time, and goes to around 34 or higher when i give it small amounts of gas. A couple of times it remained at 27 while at idle. Other times it will hit 0 when i let off the gas. The bank 1 stft (short term fuel trim), O2 numbers, are relatively numerically close to their bank 2 counterparts; I don't see any drastic differences, and the numbers are pretty low both in both pos and neg ranges. That said, I have never looked at the live data before so I have no idea what's normal and what's not.
I'm looking for someone who knows what the numbers should be, and would be willing/ able to help determine/diagnose the issue(s). I cant find anyone where I live who can do this. I am more than willing to pay for the services.
Much appreciate any help/advice.
R
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