Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by eshorvath, Oct 17, 2002.
I am hearing a rumble from the exhaust when I let my foot off the peddle..
What causes this?
Does anyone know what causes this? How can I fix it? Is it normal?
My truck does the same thing. I'm pretty sure it has something to do with a change in the exhaust backpressure when you let off the gas........
What gearing and tire size do you have? If its at higher speeds and you have low gears its engine braking and everything does that
Ya oughta hear mine LOL
did you just install a lift on it?...if so may be that the drive line angles are off...or maybe you even have a u-joint goin out..
I am running 36x12.5 tires. I think I have standard gearing, I never changed it.
I have had the lift on it for over a year. I just put a new motor in it.
What would drive line angles or a u-joint going out have to do with rumbling from the exhaust?
Would extending my ekhaust out further from the mufflers help? Right now my exhaust ends behind the mufflers. Goes from headers through 36 inch segments to mufflers.
Has this same thing happened to you?
how about your catalitac converter?
What Cat converter???
Mine entire EGR, smog stuff fell off when I hit a speed bump. Heehee
hum...uh....yea....i dont have a clue...next
definitely, if you extend pipe after the muffler, you will reduce the rumble.
The longer you go the smoother the sound. Stock there was 3 feet after the muffler.
Is it bad to run my truck like this?
Just more noise, if you don't mind it
Is it normal or ok for my truck to run like that? It only happens when I take the gas off.
i know that if you have a transmission with a lockup convertor, it will continue to stay locked up until you either apply the brake or get on the gas again. my truck does it, but it's very quiet.
my first thought was that its mildly backfiring. There are a lot of things that could cause it, on mine the valve which works in conjunction the smog pump was toasted (diffuser or diverter or something) so air when getting injected when it shouldn't. Do you have even a slight miss at idle? Is it worse when you are coasting at high RPM? Make sure your ignition is in good shape and timing is correct.
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