P0016 only trips code in morning, no light, and history "no codes present" what causes ?

Question

well my 04 Trailblazer gets this P0016 code in the morning when cold, it then once warmed up the DTC will go off . With the scanner it will show the code was thrown after the last time cleared, but not in the history. and it will run most of the day with out tripping again.

So I'm wondering if this is a sign that the timing is ok, the chain, if not lined up should make "hard starts" or stall conditions, I recently bought it. so not aware of any work done, and it runs fine starts easy. After warmed up it does mis # 3, intermittently at Idle , but it doesn't lite the MIL. service engine light.

I have changed: CKP sensor CMP sensor, Cam Actuator solenoid, spark plugs, oil 5-30, & transmission. I have done the C.A.S.E relearn with the scanner,

I can't help but think if timing chain was the issue in would not run like it does (good) most of the time, not throwing the P0016, except in the morning.

I need to get smog inspection, soon

Answer 1

The Ignition Distributor is the part where the spark plugs cables connect. Before you change the distributor, I recommend replacing the Ignition Distributor Rotor and the Ignition Distributor Cap Seal.