Jump to content

Exhaust leak sound while under load

hotrdlx

Recommended Posts

briand41 Enthusiast

briand41

Posted
Posted

I've had my exhaust system replaced twice and the sound still persist.  I have it back at the dealership and they can't replicate the sound.  I've even provided them the aforementioned TSB and they say that's not it either.  I went on a ride-along with the technician and was unable to reproduce the sound due to the engine not being warm enough - even though I advised it needed to be driven further to get to the sound to be present.  I asked them if they drove it afterwards and they said they drove it "about" 10 miles out and 10 miles back.

 

I'm considering taking it to another dealership - will my case notes and warranty work be available for them to review?

  • 5 weeks later...
  • Replies 142
  • Created
  • Last Reply
300 Blackout Enthusiast

300 Blackout

Posted
Posted

Vacuum pump, located at the bottom of the driver’s side of the engine, exhausts air into the crankcase. Sounds like a manifold leak if you can hear it which in my truck seemed to be more prominent when it was cold. I removed mine and replaced it with an electric vacuum pump. So far, I haven’t heard the choo-choo-train in the morning at cold startup nor do I hear any exhaust leak type noises.

  • 3 months later...
mferry22 Enthusiast

mferry22

Posted
Posted

I had my vacuum pump and steering shaft boot replaced this weekend and I'm happy to report that the noise is finally gone. I don't know which was the culprit or if it was a combination of both but the noise is gone.

  • 5 months later...
rastasquid Enthusiast

rastasquid

Posted
Posted

After having this problem come and go for the past year, (truck currently has 15k miles), I replaced the shaft boot and it's totally gone. Grabbed it on amazon for $22, prime. I know I could have gotten it under warranty at the dealer but for $22 and 30 minutes in my garage i'm totally happy with the results rather than spending half a day at the dealership. I used part # 25815601 as previously mentioned in this thread by others. 

geswek Enthusiast

geswek

Posted
Posted
After having this problem come and go for the past year, (truck currently has 15k miles), I replaced the shaft boot and it's totally gone. Grabbed it on amazon for $22, prime. I know I could have gotten it under warranty at the dealer but for $22 and 30 minutes in my garage i'm totally happy with the results rather than spending half a day at the dealership. I used part # 25815601 as previously mentioned in this thread by others. 


What did you use for lubricant?


Sent from my iPhone using Tapatalk
  • 10 months later...
Jmaksy24 New Member

Jmaksy24

Posted
Posted
On 3/9/2019 at 10:05 PM, mferry22 said:

I had my vacuum pump and steering shaft boot replaced this weekend and I'm happy to report that the noise is finally gone. I don't know which was the culprit or if it was a combination of both but the noise is gone.

What kind of noise were you having? I’m having a weird noise where it’s very prominent going uphill at a low rpm, you can feel it under your feet. Changed the exhaust. Got a new Y cat pipe. Nothing has fixed it yet 

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,866
    Total Members
    8,960
    Most Online
    Greg3160
    Newest Member
    Greg3160
    Joined

  • Who's Online   3 Members, 0 Anonymous, 363 Guests (See full list)

  • Latest Articles

  • Posts

    • MANGOAL
      Mangoal or FitcamX OEM Dashcam?

      By MANGOAL · Posted

      Late reply, but yes—it works on the SLT trim. Compatibility comes down to the plastic shroud shape behind your mirror, not the trim badge itself. On the SLT with auto-dimming, it uses a plug-and-play Y-harness off the mirror/rain sensor power, so no need to run wires down to the OBD port. If anyone's ever unsure about fitment, just drop a photo of your mirror housing and we can double-check it.   Appreciate the detailed feedback on the install! On the windshield glare—we actually took feedback like yours and developed a dedicated CPL (polarizer) filter to cut down dash reflections on sunny days. If you're still running the cam, shoot me a DM. I'd be happy to send a CPL filter over for you to test out—no charge. 
    • davester
      2002 GMC Yukon

      By davester · Posted

      There are no stickers in your glovebox?
    • davester
      Weight limit in bed

      By davester · Posted

      Look at the numbers on the stickers in the door jam...
    • EJS2015
      Actual Full Screen CarPlay on Refreshed Silverado/Sierras.

      By EJS2015 · Posted

      Yes, every time the developer updates his code, you must recompile. I will private message you with the latest because it changes pretty much with every version.
    • Grumpy Bear
      Transmission Temperature Hitting 220s

      By Grumpy Bear · Posted

      After I wrote that reply I went for a ride. 85 F out. So trans started at 85 F and it shifted the same as it did an hour latter at 168 F. I've never actually recorded the to cold to shift point but it is under 32 F before they start hanging on to a lower gear or leaving the converter unlocked. Both intended to heat fluid.    Yes, brake or bake. Absolutely.      Your welcome. True research ended decades ago. Field trials are still in play.    There is a thing called oxidation onset temperature. This is the heat related oxidation not the O2 exposure kind. For mineral oil that starts at 140 F. So what happens after 140 F? Each 20 F cuts fluid life in half! Does using a Full Synthetic improve that? Yes! By how much? Depends on the base oil type and a few other factors. But enough to notice. Some esters are even higher. There are even synergies between types the will raise it higher than any one component is alone.    Then there is "Hindered" oils. Antioxidant additives. Hindered Polyol Esters can sit at 500 F for years in a turbine.   When a blender brags his oil will 'take 500 F" in service he doesn't specify for how long. Water will dance on a 500 F hot plate for several seconds. @newdude put up a chart showing the relationship between fluid temperature and it's life in an automatic transmission. Here's a version of that chart for Group III based oils. These temperatures are those in the pan as observed as 'normal'. that is you drive as you do for as long as you do under what load you ask of it and whatever that temperature is this graph applies to. Flash temperatures of a few minutes isn't what his means.    Note that fluids held at a constant 240 F have a service life of only 20K miles. 220 F explains the factory exchange limit, eh? My equipment I keep under 180 F and I'm good if the cooler will hold it as low as 140 F. But that's me.   

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...