Engine Noise

[8182Rab82Cad]

I need some good ideas to determine what I am hearing. About 10,000 miles ago, I put a rebuilt head on my 1.6N/A which has about 250,000 miles on the block. It has always started without heat in single digit temperatures. A few months ago, it started with an unusual tapping or clicking sound. It got a little quieter after a minute or two so I drove it home. Since then, I took the head off and looked at the valves but saw nothing obvious. I re-assembled the engine. The sound is still there but is not too obvious until the rpm is up. The other day I was driving it going down a hill at 25 to 35 mph and noticed the sound disappeared when I was coasting but came back when I started giving it fuel again. (Prior to removing the head, I checked compression and it was good if not a little high. )

Is the the valves or the block? Is there a good test to try?

[TylerDurden]

Did the enging get timed by the book? Injectors matched? Piston clearance to head checked?

[Fatmobile]

Could be an injector if it only sounds when fuel is applied.

[8182Rab82Cad]

It was timed by "the book". Glow plugs were replaced with rebuilt ones.

[sgnimj96]

where can I get my glow plugs rebuilt? Haha, just kidding

[8182Rab82Cad]

OK, oops, Injectors were rebuilt.

[Fatmobile]

Better to time it by ear than by the book.