Clunking/clacking during morning starts..
So.. 233k on the dash and my car runs great still... 180 something PSI on all 4 cylinders, everything is fine and dandy. Last oil change didn't contain anything nasty in it either.
It's getting down to 20-40 degrees in the morning here in Oregon. The car started like new until now.
Now it does 1 of 2 things when cold starting:
1. Idle dips a little immediately after being started, then proceeds to rev up to 1500-2000rpm and gradually drop down to the normal idle as the car heats up.
2. Car idles up to 1500-2000rpm, idle doesn't dip.. but motor makes loud clacking sounds, almost like piston slap. This happens for about 1-2 seconds, but the car idles normally.
This motor performs great normally. Any theories?
It's getting down to 20-40 degrees in the morning here in Oregon. The car started like new until now.
Now it does 1 of 2 things when cold starting:
1. Idle dips a little immediately after being started, then proceeds to rev up to 1500-2000rpm and gradually drop down to the normal idle as the car heats up.
2. Car idles up to 1500-2000rpm, idle doesn't dip.. but motor makes loud clacking sounds, almost like piston slap. This happens for about 1-2 seconds, but the car idles normally.
This motor performs great normally. Any theories?