2005 XC90 2.9 ltr awd tr6 high pitch ping when under load/vacuum leaks
 

2005 Volvo XC90 2.9 TR6 AWD
When I start car it runs very rough. As it warms up it smooths out nicely and runs great. I always allow my cars to warm up before operating.

When I drive car and I accelerate to speed up I hear a high pitch pinging coming from engine. When I let off the gas it seems to go away.

When I turn off engine I hear a buzzing coming from the passenger side area of the motor, like something is running I guess.

I do get a few codes and some codes indicate a possible vacuum leak ? among other things but that is a common factor with them.

I do get a brake message in the message center and the engine light has come on.

Any ideas Please?
Thank you

The buzzing noise is normal. As long as it turns off within a few seconds after you shut off the car.

If you have a vacuum leak, which is very possible, the first thing to check is all the small vacuum hoses all around the engine for cracks and leaks. Just do that as a matter of routine anyway.

The next step is to pull a spark plug and see if it's super bright white and clean, indicating over-heating, which is a symptom of a vacuum leak.

Do those two things first, then proceed with further diagnosis. Get back to us with the exact codes.

Reply
 

Thank you

Did smoke test. Found hole in tube that connects turbos, replaced.
Did smoke test again last night; alot of smoke coming out of oil filler
Will run codes again today There appears to be a blockage I believe if the smoke is coming out of the oil filler cap

Codes prior to locating hole used Vida to run codes

ecm-120c
ecm120d
ecm121b
ecm3100 mis fire at start up
ecm3210
ecm3220
ecm323d
ecm6140

My vehicle started fine this morning, no rough running until warm, which was the case prior to locating the hole

Thank you

Smoke out the oil filler is a problem that is common. Replace that O-ring!! There should be no leak there. This will create a vacuum leak through the crankcase ventilation system. Could be your problem. There is also general service to the Crankcase ventilation system that may need to be performed as well. Do the easy things first, then re-check any new codes. Clear the old ones first. It's not a bad plan to disconnect your battery for 5 minutes then reconnect to reset the computer back to factory settings when you do maintenance like this. Keep at it and you'll get to the solution. It takes patience.