87pickup

when i give it some gas and go up to about 2500 rpm and then let it rev down it makes a weird sound, its hard to describe. all i can really ask is has anything like this ever happened to you guys? if so please help, i know my oil is a little low but i dont think thats the reason it doing it by the way

Thanks

Jay351

Uhm... gonna need a little better description then that....

toyota4x4907

could the timing chain be loose? maybe the chain tensioners aren't tensing enough because of the low oil...I'm probably wrong...someone else? It could just be the normal 22re sound. valves lash maybe?

87pickup

its like a fast putting sound, the truck doesn't shutter when it does it though, its the 22r just to let you know

abecedarian

if it's carb'd, it's probably something in the air injection system- likely the diverter valve.

EFI or carb'd: if the noise is coming from the tail pipe, it could be a misfire during engine deceleration.

toyota4x4907

right. I forgot Toyota offered carbs through '88. Maybe the carb and/or air filter needs to be cleaned or replaced....Probably not it either...but just giving suggestions...

abecedarian

I should add that if it is the diverter valve making noise, if the truck has been emissions tested recently and isn't running poorly, there shouldn't be anything to worry about. The diverter valve basically receives air from the air pump and diverts it either to the exhaust manifold, or vents it (to the air filter housing, if i remember correctly) depending on engine operating conditions. So a puffing or putting noise may be heard when the valve vents the air out instead of sending it to the exhaust.