BruceW

I just had a bunch of work done on my 96 Tacoma, now have strange noise.

It is a '96 3.4L 4WD extended cab. When I am driving around sixty and go downhill, with a bit of gas, I am getting a strange vibration/noise. The closest thing I can think of that it sounds like is the exhaust brakes on trucks. It is not very loud though. Seems to be coming from beneath me or someplace in the front of the truck.

Recent work:

Tune up
Valve adjustment and new gaskets
New timing belt and all other belts
OME medium stiffness front springs and firm shocks
Alcan rear springs from Wheelers and OME shocks
Drop bracket for exhaust
Brake extension for rear breaks
Running 265/75R16 tires on Wheelers wheels (the 'B' style)


Any thoughts on what it might be? The sound showed up after the work was done this weekend. I just drove 600 miles away from home on a trip, and am a little concerned, especially since I am going to be heading out fishing...

Thanks for any help...

BajaRunner

Is it coming from the engine, or somewhere else on the truck?

ozziesironmanoffroad

power steering resoiver? sorry for the butchered spelling. thats all i can think of.. unless theres a huge vacuum leak that is hissing, which i highly doubt... speaking of hissing, did you check for snakes?

BruceW

I am having a hard time figuring out where it is coming from. I am hearing it form below and maybe a bit in front of me...

Ron Helmuth

perhaps an exhaust leak at the catalytic converter or muffler? just guessing

BruceW

I was wondering about an exhaust leak.

Wouldn't that show up whenever I was on the accelerator though? Not just dudring a specific circumstance?

Thanks

Ron Helmuth

Bruce yes that makes logical sense that it would be everytime while on the gas-but backpressure is not always logical in my experience.....

I'm just guessing- I have no empirical knowledge of these things....just throwing out a bone as someplace to begin the search....

xsvtoyz

because of all the suspension work I would be looking at the drive lines possible angle issues possible loose bolts possible mistimed driveshaft if they had to disconnect it

Kaleb

I had the same sort of thing happen after I did the SAS to my runner. I never did figure out, but after I did the 5 speed swap it completely stopped. SO my guess would be the tranny.

wutastic

sounds like an exhaust heat shield.

BruceW

Thanks for all the replies.

I will have to look at the heat shield as well...

I am wondering if it might not be some kind of driveline vibration or something.

I found it happening most of the time on the freeway, in 5th, about 2200-2600 RPMs.

Most often showed up just after cresting a hill, and letting off the gas. It showed up at different times when I was on the gas or not though.

I have to take it in anyway, figured I'd have them look at drive lines etc and get everything lubed well down there.