Hipirihop Posted April 24, 2014 Share Posted April 24, 2014 Hello Iam from Chile and new in the forum, I would appreciate if some can help me with the following: have a strange noise on a GU 813 2009 at cold start up (5 to -5 Celsius) the engine starts ok, but suddenly an air blowing noise is heard out of the exhaust and behind the turbo, some times like a whistle, the engine comes down in rpm's and then up again (only once), like if a exhaust brake is on (it has no engine brake). If I push the main air parking break off, it all comes back to normal, and the engine comes back again, it feels lighter, what can it be???thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/35509-blowing-air-noise-thru-the-exhaust/ Share on other sites More sharing options...
Mackpro Posted April 24, 2014 Share Posted April 24, 2014 If your truck has an EGR valve toward the rear of the exhaust manifold, it could be that opening or closing. Also if the has a turbo with an actuator on it , that could be normal. as long as its not leaking exhaust anywhere, its probably good. being an export model from the US i dont know what kind of emission system would be on the truck/engine. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/35509-blowing-air-noise-thru-the-exhaust/#findComment-243207 Share on other sites More sharing options...
Hipirihop Posted April 25, 2014 Author Share Posted April 25, 2014 mackpro68 thanks for the information!!! Quote Link to comment https://www.bigmacktrucks.com/topic/35509-blowing-air-noise-thru-the-exhaust/#findComment-243326 Share on other sites More sharing options...
rsb502 Posted April 26, 2014 Share Posted April 26, 2014 Sounds like a vgt turbo or wastegated turbo closing off to raise the engine temp when its cold to me. Does it happen when its warm? If not after the engines up to temp its just helping it warm up. 1 Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/35509-blowing-air-noise-thru-the-exhaust/#findComment-243436 Share on other sites More sharing options...
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