2.3-16 noise in engine bay...

[SanFranBenz]

Hello...
Hoping someone can help with a possible diagnosis...

I am driving a 1987 2.3-16 that had the timing chain and tensioners replaced approximately 30,000 miles ago. During a recent cross-country trip, the car developed a noise in the engine bay. After running at higher speeds for a half an hour or so, there is a "humming buzz" that can be heard inside the car. If I stop the car immediately, the noise continues for five minutes or less, but if I shut off the car and restart the engine, the noise disappears. The noise sounds like it is coming from the engine block at the fuel injectors. The noise does not appear to affect the performance in any way. Any help would be appreciated... I have a couple of GREAT mechanics in the San Francisco area (Tony & Bob Auto in Burlingame) and a good mechanic in Florida, but NO ONE in Michigan! I'm getting ready for the next leg of my America Tour in a few weeks from Michigan to the Florida Keys and would like to solve this problem before the trip!

Thanks in advance!

-Peter

Weird. Maybe a mechanic's stethascope (or a dowel rod, whatever is on hand!) would help find out exactly where the problem is? Stick it in yer ear against the bone, and the other end on the engine where you think the noise is coming from. Humming buzz maybe sounds like fuel pump, but its in the back...Aux water pump can go bad and make some noise, but can't imagine it being loud enough to hear in cockpit. Dunno why much of anything would make a sound after the engine is off.


cheers,
dan r.

ps. we might be having a gtg in SW florida (naples/ft myers area) in the next few weeks. drop me a line when you come through and we'll have a cold one if nothing else

[SanFranBenz]

thanks Dan...
keep me posted on the gtg... if i'm in the area, i'll definitely swing by!

just to clear up one thing... the noise disappears when I shut off the engine AND does not reappear when I restart the engine... sorry if i was unclear...