I recently changed all of the plugs and one coil that appeared to be flaky. The idle is a little better, but not great. I also cleaned out the reset valve and installed a new gasket. I tested it with 12V and it clicked without sticking, so it appears to be good. Resistance is right on the money. There was almost no debris in the gasket screen. The oil has 2,000 miles, doesn't look bad (Mobil 1 5W-30 Extended Performance w/Mobil 1 filter). Oil level is correct.
Other symptoms:
Hard start on cold start - almost always have to crank it over twice.
Slightly rough idle
Mileage is probably down a bit.
I have a VIDA/DiCE (2013A version - fantastic tool for $128, BTW). Following the procedure to read out the cam adaptation values, I'm getting readings in the 48-51 range. That is not close to the range covered below. The values vary a little while the engine is running, probably about +/- 1 degree.
So do I take it back and have them check their work? Is the exhaust cam position the most likely cause? The thing that is throwing me is the cam values at 50-ish (way above 20).
Thanks in advance for your input.
This is what VIDA says (slightly edited for brevity):
Diagnostic trouble code (DTC) ECM-644A is stored in the engine control module (ECM) if the camshaft is not in the correct position. The engine control module (ECM) registers this as a fault as soon as the engine is started.
Substitute value
-the variable camshaft is disabled
Possible source
Faulty position
-camshaft belt has jumped out of place on the cogs
-defective reset valve
-mechanical fault in the Variable valve timing (VVT) unit
Faulty control
-defective camshaft position (CMP) sensor
Control too slow
-low oil pressure
-poor oil quality
-defective reset valve
-mechanical fault in the Variable valve timing (VVT) unit
Fault symptom
-poor performance
Checking the fault type:
-Check camshaft position (CMP) sensor connector for contact resistance and oxidation
-Read out the adapted values for the camshaft. There are 4 values, one for each flank.
If one of the adaptation values is 20 degrees, the camshaft reset valve has stuck. Replace the camshaft reset valve.
If one of the adaptation values is less than 9 degrees, the camshaft reset valve is defective. Replace the camshaft reset valve.
If any of the adaptation values are between 10 and 19 degrees, the variable camshaft must be adjusted in relation to the crankshaft. Adjust the camshaft.
Remedy as necessary.
-Check reset valve camshaft resistance between both terminals #1 and #2, resistance should be approximately 3.7 ohm.
-Check the oil level and oil quality.
Check that the variable valve timing (VVT) unit and reset valve function mechanically.
Remedy as necessary.
