Strange knocking sound from engine compartment

[bronco_ls]

I have noticed this over the past few days a strange knocking sounds coming from the engine compartment of the LS. This only seems to start after I have driven about 30 or so miles. I only hear it with the throttle at a just off idle position, holding position or as I pas through during acceleration and deceleration. If I am past this position of the throttle then the noise goes away. To me it sounds like a spark knock, or possibly an injector.

Has anyone had this happen, any ideas what to look at

Thanks
SD

 

[2001LS8Sport]

If it indeed is detonation, it could be serious and needs to be looked at. If you're not comfortable diagnosing it yourself, immediately take it to someone who is. If nothing else, just run it by the dealer and have someone take a quick ride with you.

 

[bronco_ls]

kinda what I thought, I am old school give me a carb and distributor and I will tune that thing up right. Not to sound like an old fart "This ne fangled computery cars ...." but I have alwas been a bit behind on how to tune the right.

I do my best to run 92 octain every tank but will admit that I don't alwas get it from BP/Amaco as I would like to. For got to mention the car had 65K miles and I know that is about the time to do plugs on a normal car. Is that possible the case here.

I have an autotap OBDII EEC V up code reader but was not sure if that would work on the LS, althought it has not set any codes yet.

SD

 

[paulownian]

Bronco LS's story reminds me of an old story that circulated the maintenance ranks on just about every flight line in the entire Air Force.

An old story that many say really happened in the early '70's goes something like this:

A pilot comes back from his flight and debriefs the maintenance squadron that there is a sound coming from beneath the ejection seat. He says that it sounds like "...a little man with a hammer". Of course, the crew chief has heard all of this crap before; mysterious sounds that never have a real cause. So, instead of wasting his time pulling the ejection seat looking for a non-existent sound, the crew chief simply annotates in the maintenance records: "Found little man, took away hammer".

 

[2001LS8Sport]

Bronco LS's story reminds me of an old story that circulated the maintenance ranks on just about every flight line in the entire Air Force.

An old story that many say really happened in the early '70's goes something like this:

A pilot comes back from his flight and debriefs the maintenance squadron that there is a sound coming from beneath the ejection seat. He says that it sounds like "...a little man with a hammer". Of course, the crew chief has heard all of this crap before; mysterious sounds that never have a real cause. So, instead of wasting his time pulling the ejection seat looking for a non-existent sound, the crew chief simply annotates in the maintenance records: "Found little man, took away hammer".

That is hilarious...and very true! I was a crew chief in the Air Force in the early 70's (Vietnam Vet) and that story was going around then...

 

[black_lincoln]

thats funny. we have new stories now on the flightline..i`m a specialist and we work with the crew cheifs also. so i hear alot of stories.