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engine valve noise under load
Posted: Tue Aug 13, 2013 5:24 am
by jasonr73
1992 astro awd ext, just flipped 100k and has valve noise under load. Not egr, not gas issue,not bad gas,not vaccum,not timing, absolutely puzzeled beginning to to think I need to remove the head. Only seems to make that valve noise under load, do not hear in park or nuetral. However after a night of sitting it chugs when started and then clears up, Can anyone help. :-k
Re: engine valve noise under load
Posted: Tue Aug 13, 2013 4:15 pm
by doyoulikeithere
Just a FYI,
I chased a similar sound around and it sounded (from the drivers seat, driving) like valve noise - under load.
Eventually, I discovered it was the "Skin" on the catylytic converter was rattling, amazingly, only under load.
It was a 1990 GENI with the big flat style cat, and I have the same sound now coming from another, at least this time I know...
That skin gets rusted, develops a hole (not a leak) and then the skin can rattle against the body of the cat.
May not be your issue but worth a mention...
Re: engine valve noise under load
Posted: Tue Aug 13, 2013 6:37 pm
by Smiliesafari
The element in the cat on my '96 came loose. It rattled too.
Re: engine valve noise under load
Posted: Tue Aug 13, 2013 6:41 pm
by 1Gary
If it is the cat,turning in your old one at the scrapper yd can be worth some cash to offset the replacement costs.