Calan
DSM Wiseman
- 7,250
- 398
- Jan 16, 2007
-
OKC,
Oklahoma
As you know if you have read any of my threads, I'm in PK H$$L. No matter what mods/tuning I do, I have random PK at any RPM, any temperature, any octane, moving or not, etc. Lifters can be rattling like crazy and no PK, or engine running quiet and smooth as a baby's butt and PK everywhere. (Today I had a couple hits of 12 or more counts right after I started it at idle, and the car was running great). I've done everything from replace the sensor to blood offerings to the DSM gods... 
So last night I'm tinkering around a bit and notice a philips grounding screw on the block right below the coil pack plug (drivers side of intake), with two or three wires on it. It was completely loose, and one of the wires attached to it runs up into the harness where the knock sensor comes out, so I said "YEAAAAAAA... I think I might have found my persistent PK problem!"
Wrong..
... I tightened it up and this morning I had more knock than ever for the first 5-10 miles I drove my car (mostly between 10hg and 0 to +5psi boost), and then it quieted WAY down. The last 5 miles were virtually knock free, although not quite. (I didn't clean the oil off of the area first though... wonder if that mattered...)
Any connection (no pun intended
?
Are there other grounds that could be likely suspects? I haven't had time or the energy to trace out and test the whole wiring system
I'm starting to wonder if the PK (or maybe some real knock) has anything to do with the MAF-T... although my AFR, O2, and trim's look fine, I wonder if there are small anomolies that are causing knock hits as the MAF-T changes tables from Idle-Mid-WOT. "Real" knock usually happens as I accelerate from a light at low throttle and no boost. I usually have no knock or at least very little at WOT.
BTW - all of this today is on 101 octane.
So last night I'm tinkering around a bit and notice a philips grounding screw on the block right below the coil pack plug (drivers side of intake), with two or three wires on it. It was completely loose, and one of the wires attached to it runs up into the harness where the knock sensor comes out, so I said "YEAAAAAAA... I think I might have found my persistent PK problem!"
Wrong..
... I tightened it up and this morning I had more knock than ever for the first 5-10 miles I drove my car (mostly between 10hg and 0 to +5psi boost), and then it quieted WAY down. The last 5 miles were virtually knock free, although not quite. (I didn't clean the oil off of the area first though... wonder if that mattered...)Any connection (no pun intended
?Are there other grounds that could be likely suspects? I haven't had time or the energy to trace out and test the whole wiring system
I'm starting to wonder if the PK (or maybe some real knock) has anything to do with the MAF-T... although my AFR, O2, and trim's look fine, I wonder if there are small anomolies that are causing knock hits as the MAF-T changes tables from Idle-Mid-WOT. "Real" knock usually happens as I accelerate from a light at low throttle and no boost. I usually have no knock or at least very little at WOT.
BTW - all of this today is on 101 octane.
