I have a 2018 Lexus Gx 460. Only when accelerating hard, it makes a sporadic sucking noise, sounds like it is coming from the air intake. It has no performance issues whatsoever: no loss of acceleration, no check engine light. seems rather symptom-less except for the noise. So far, I have tightened the clamps around the air intake going to the throttle body, as well as change the air filter, to no avail.
Any suggestions as to what to look at before giving in and going to a mechanic? This noise is pretty annoying.
Thank you community.
Scotty says turn the radio up and buy a PCV valve or change air filter or clean throttle
https://youtu.be/81eZnqtWN80?t=420s
would't a vaccum leak trip the check engine light? or not always?
if it was bad enough, probably.
Since it's making a sound, you should be able to follow your ears and find it. Or get a mechanics stethoscope or piece of tube.
would't a vaccum leak trip the check engine light? or not always?
No, not always. Not everything that can trip a code, does trip a code. Not everything that does trip a code, will trip your CEL. So a vacuum leak may or may not trip a CEL.
Using a good scan tool (one with live data capability) might help you identify a possible vacuum leak as the issue, but that leak would still have to be searched for and located somewhere along the intake system.
would't a vaccum leak trip the check engine light? or not always?
It would have to be a pretty serious vacuum leak, +/- 20% or more is required to trip a CEL. Live Data, looking at Short-term fuel trim (STFT) is what you're looking for. If there's a vacuum leak, the car will compensate by adding fuel, which will indicate a positive value (the vacuum leak indicates to the computer that the engine is running too lean, thus it attempts to enrich the mixture).
Unfortunately, to no avail, the noise is still there.
Please keep all information about a problem together in the same topic thread. (In this case, how is anyone supposed to even know what noise you're talking about without having to manually go back and research your previous posts?) Thank you.
Topics merged.
Hello, it’s me from the last 2018 Lexus post.
to Scottie’s recommendation, I replaced the pcv valve, there was significant brownage around the intake of the pcv hose to the intake manifold. Unfortunately, to no avail, the noise is still there.
over the past two weeks, it had gotten lowder, and to the point the car is now pinging significantly once the engine is warm. I am taking it to an repair shop, hoping they can find the noise.
my question is, anything else I should look at? Last thing I want to have happen is they recommend some stupid repair that is guesswork on their part too.
After taking to multiple mechanics I have no luck, and it has now been confirmed it has developed a ping when accelerating. The vehicle has no performance issues, no light, no codes, no rough idle, and yet it pings as well. What should I do? Would hate to have to get rid of the thing and lose alot of money in value. Help!