rumble from engine after startup 98 v70 na

frisky99 · Post by **frisky99** » 17 May 2017, 16:19

1998 v70 na Hello , I have that kind of low whine on initial startup and exhaust noise under load so I started poking around looking for some minor leak but noticed after startup the engine sounds fine and then gets a low exhaust rumble lasting a short time. Is this related to the secondary air injection system. The initial sound and the later one don't appear to be related . No codes and seems to be running fine. Any need for concern ? Thank you , Frisky

Post by **misha** » 17 May 2017, 16:55

Whine could be from SAS pump and exhaust noise could be from flexi pipe small leak.

frisky99 · Post by **frisky99** » 18 May 2017, 17:40

Thanks misha , Blocked off the exhaust and with back pressure still couldn't find an exhaust leak. I removed the heat shield above the manifold to get a good look , too. I will wait until the symptoms become more obvious. The engine noise starts about 10 seconds after start up and seems to come from the front lower left of the engine. Comes on suddenly like a switch or relay starts it and then stops after about a minute or so. I will wait these out as long it drives OK. Thanks again. Frisky

Post by **misha** » 18 May 2017, 17:46

frisky99 wrote: 18 May 2017, 17:40 ...The engine noise starts about 10 seconds after start up and seems to come from the front lower left of the engine. Comes on suddenly like a switch or relay starts it and then stops after about a minute or so....

It would be the SAS pump.Location is correct.It's under battery tray and cruise control.
Does it appear only on cold starts?