Exhaust noise question
12-02-2008, 02:36 PM
#1
Thread Starter
Join Date: Nov 2008
Location: California
Posts: 17
Exhaust noise question
I just bought a 86 LX with a 3.8L. It has a small exhaust leak that I'm going to fix this weekend, but I don't think that will fix my problem. When I rev the motor the exhaust sounds fine, but when I let of the gas it makes a sound kinda like little backfires. Kinda like put put put. Does anyone know what might be causing this. I've put new filters, plugs, wires, and a new muffler on, if that helps. This is my first restoration so I'm new to alot of this type of stuff, so thanks for your help. Cory
12-02-2008, 10:44 PM
#2
3rd Gear Member
Join Date: Dec 2003
Location:
Posts: 518
im not 100% sure but it might not have a smog pump or maybe a bad smog pump not sure wat it does but my trans am makes that noise when i let off the gas and i kno that doesnt have one i kinda like it but it is a 400 so its little deeper muscle sound not sure wat a 3.8 would sounds like
12-03-2008, 10:45 AM
#3
Thread Starter
Join Date: Nov 2008
Location: California
Posts: 17
It has a smog pump, and i think its good. I live in California and your car has to pass a smog test to be registered. It just passed three weeks ago, so I assume the smog pump is good. As for the sound, it sucks! It sounds like the car is a POS, but it seems to run great. But thanks for your help.
12-04-2008, 10:12 AM
#6
5th Gear Member
Join Date: Mar 2004
Location:
Posts: 3,594
it's small amounts of unburned fuel igniting causing small backfires or popping. just about every car does it. some are more noticable than others. timing can be adjusted to reduce it or increase it if you want but you will never get rid of it. my car does it it's no big deal and nothing is wrong with your car
www.moranav6racing.com and www.supersixmotorsports.com both make performance stuff for your year mustang if you ever are interested in making more power
www.moranav6racing.com and www.supersixmotorsports.com both make performance stuff for your year mustang if you ever are interested in making more power
12-05-2008, 06:07 PM
#8
Thread Starter
Join Date: Nov 2008
Location: California
Posts: 17
it doesn't sound like a normal running car, carb or not. it a loud sound that sounds like s**t. maybe it is the timing. does anyone know how I should change the timing? I've heard that advancing the timing gives a little extra kick. I'd like to try that but don't know how to do it. any help would be great!
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