4" stainless Magnaflow

[Cyclist 06]

Ok I had a friend at Meineke install my 4" Magnaflow turbo back and ever since, there has been a minor but noticeable vibration at low rpm's. I went back the next day and he torqued all the bolts down but shortly after the vibration was back. Have any of you Magnaflow guys had this experience? I've been under the truck and under the hood but cannot isolate what might be causing this. It sounds like it is coming from the turbo area. I'm at a loss? My friend even tacked all the connections under the truck but with no luck.

Any help?
Scott

[mschn99]

Originally Posted by Cyclist 06

Ok I had a friend at Meineke install my 4" Magnaflow turbo back and ever since, there has been a minor but noticeable vibration at low rpm's. I went back the next day and he torqued all the bolts down but shortly after the vibration was back. Have any of you Magnaflow guys had this experience? I've been under the truck and under the hood but cannot isolate what might be causing this. It sounds like it is coming from the turbo area. I'm at a loss? My friend even tacked all the connections under the truck but with no luck.

Any help?
Scott

as with anything, if something is "bound", there can be a vibration. i have felt exhaust vibrate so bad you would thing the driveline was out of balance. the best thing to do would be to "isolate" it. loosen the clamp on the turbo....and loosen all the clamps or bolts on the way back.....mount it too the turbo the way it naturally seems to want to sit.....then tighten everything as you go back. this may help......

on a side note.....NEVER weld, even tack, anything on these trucks. i probably replace four PCM's a year due to this. the only way its safe to weld on these trucks is to disconnect the positive cable, and then EVERY ground wire on it. if one small ground is still attached there is a possibility of frying a module......not to harp or anything...but i thought it was worth mentioning.......Marc

[Cyclist 06]

Thanks for that tip about the welding. He did say he had a hell of a time with the downtube so things must be bound up. I'll bring it back and have them grind the tacks and loosen it all up.
My truck is running fine so Hopefully the tack welds did not do any damage to my pcm.

Scott

[mschn99]

Originally Posted by Cyclist 06

Thanks for that tip about the welding. He did say he had a hell of a time with the downtube so things must be bound up. I'll bring it back and have them grind the tacks and loosen it all up.
My truck is running fine so Hopefully the tack welds did not do any damage to my pcm.

Scott

if your not having any problems, the welds did not hurt anything....you would have had an immediate problem if they had.........some guys have done it a bunch with no problems...others do it onece and it messes things up.....but its a pretty big gamble....thats why i mentioned it.....Marc

[99Smokin73Stroker]

Cyclist I had the exact same problem which grew worse over time. I had the 4" magnaflow turbo back and eventually the vibration was getting on my nerves so I crawled under to look at any areas where it was close to hitting anything. I eventually noticed that the tubing was pretty much laying right on top of one of the bolts that connects the tranny crossmember to the frame. Conveniently enough there was a clamp right there so my buddy and I bought an exhaust hanger from the auto parts store, loosened the clamp and put it under the hanger, then pulled it away from the bolt and connected it to the crossmember. I Started it up and the vibration was gone. It's very possible that you have the same problem...so take a look.

[Cyclist 06]

I'll check that out this morning, thanks for the tip

Scott

[99Smokin73Stroker]

Hey no problem Scott! I read that post and laughed through most of it knowing that you were probably going through the the same frustration that I was. My noise too sounded as if it was coming through the engine bay. Acutually I heard the sound more around the airbox area than anywhere else cuasing me to go nuts looking for anything and everything that was touching something in that area......but once I had my buddy push the exhaust off the bolt, the noise disappeared. If yours isn't touching or close to touching, I would be very surprised. Let me know what you found! Other than that, it's a great kit!