I'll try to take these in order again. I also forgot to mention that the cam synchro was also replaced at the same time that other stuff was (although the DPFS and the TRS
were slightly later).
Today I replaced the PCV
valve (it was cheap). No change.
I have been running fuel injector cleaner for 1/2 of a tank now, Chevron Techron. Periodically I've also run other stuff like the O'Reilly Auto stuff, etc.. when the mood hits. No change.
The multimeter I used (digital) is auto ranging and fairly accurate - I have used it for much more sensitive projects (electronics and motorcycle stuff) in the past. I note the primary coil resistance is clearly out of range, but what I don't know is what that *really* means.
I put one of those "show me the spark" sparkplug things on the front three today (in turn) and they all seem fine, but since I wasn't *in* the vehicle it was also hard to tell if it was misbehaving, too.
Since somebody made note of it, I've been paying much closer attention and, unfortunately, the car *does* ping even on mild acceleration, uphill or level. It /really/ pings good (no check engine lights) on uphills which is why I noticed it.
So, lots of pinging (or at least some kind of preiginition - it's certainly not knocking). It sounds like my old Buick 350 when I used 87 octane. I'm using good quality 87 octane, now, too.
Yes on the plugs - I don't recall the exact number but they are the recommended autolite dual platinums.
Cooling system just got flushed not 3 weeks ago - it was good then and should be perfect now. Never overheats, temp gauge comes up just so, laser themometer thing shows 180 to 195 on the stuff I can get at, and for the brief period I could borrow a scan guage it showed 195 to 205 but never more.
Lastly, it's not a flex fuel engine but all the gas around here has 10% ethanol.
Odd that it's pinging. The engine was very well taken care of by the previous owner - at or before scheduled maint. and always with high quality everything.
I've also done the "water in a spray bottle test" without luck. No change, no misbehavior, nothing.
QUOTE (pawpaw @ Jul 19 2009, 07:26 AM)
Well the difference in the coil packs expected primary resistance, may be due to the accuracy of your test meter, or the scale you were measuring on, but a bench output voltage test would likely tattle on any output problems.
Not sure what parts stores you have in your area, or what test equipt they have, but in my area, the coil pack gets an output voltage test, along with some others.
The ping that you hear on a pull up a grade shouldn't be there & may be a clue on the random idle miss that you feel.
Something as simple as an old worn out PCV
valve, that's clean inside & rattles when shaken, but not sealing well when it should, because it's worn inside, could cause an unprogrammed for vacuum leak, that'll cause mischief, so if it's due, or past due for replacement, why not change that low cost puppy out????
Are you using the specified heat range plugs in your engine????
Is the cooling system in good condition & is the thermostat keeping coolant temp in check????
Is your 3.0L Vulcan a flex fuel engine????
More thoughts for pondering.[/b]