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May-20-12, 07:50 PM
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#1
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DIY
Real Name: Tony
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Popcorn noise under load..
So I've noticed something lately. When I'm towing a trailer and there is a lot of weight behind me, I get a noise coming from ... Underneath? me? .. Anyways, the noise seems to sound like popcorn in my exhaust. I recently had the cat back changed to flowmaster but it does the same thing. Only when under heavy load and accelerating. Any thoughts???
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May-20-12, 09:32 PM
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#2
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DIY - King a destruction
Real Name: Walter
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If its on decel, thats normal. Is it only on decel?
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May-21-12, 04:29 AM
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#3
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Real Name: Tom
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Quote:
Originally Posted by gn2beatu
If its on decel, thats normal. Is it only on decel?
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what he said, now if its when your on the gas it could be a misfire.
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May-21-12, 06:36 AM
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#4
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Real Name: Steve
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DFCO or a leak. Are you sure it's not a marble kinda sound? That could be cats breaking up.
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06TBSS AWD, dropped, Hotchkised, tuned, bumped, bloody murdered, retrofitted 13.60
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May-21-12, 06:38 AM
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#5
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illegitiminoncarborundum
Real Name: Matt
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Sounds like detonation to me. Do you have a tune? What gas are you using?
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08' C6 M6 743/647
93' Z28 A3- in pieces
06' RCSB H/C
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May-21-12, 11:57 AM
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#6
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DIY
Real Name: Tony
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Quote:
Originally Posted by 350
DFCO or a leak. Are you sure it's not a marble kinda sound? That could be cats breaking up.
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Thats what I'm thinking. I called it a popcorn noise but it may be the cats from where the noise is. It is only on Acceleration while towing (dropping into passing gear) and normally only from 45-60mph. I'm planning to get the cats removed anyways, is that normal for them to make that noise when they are going out?
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May-21-12, 11:58 AM
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#7
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DIY
Real Name: Tony
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Quote:
Originally Posted by lt1z
Sounds like detonation to me. Do you have a tune? What gas are you using?
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93 only/always. Just changed plugs, wires, etc.
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May-21-12, 12:13 PM
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#8
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Powered by Bath Salts
Real Name: Greg
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detonation, if you are saying its under load, and accel...
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May-21-12, 12:21 PM
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#9
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illegitiminoncarborundum
Real Name: Matt
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Is the tune stock?
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08' C6 M6 743/647
93' Z28 A3- in pieces
06' RCSB H/C
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May-21-12, 06:50 PM
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#10
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DIY - King a destruction
Real Name: Walter
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If its during accel, then its detonation or cats, dont do that anymore til you get a tuner to log and adjust your tune. BAD things can happen if its detonation. Now if its the cats, no big deal, just remove or replace em. You need to find someone with a scan tool to make sure its not detonation before you do that anymore. G/L
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6.0 AWD ~ T88 Turbo ~ 60mm Gate ~ 50mm BOV
Diamond Pistons ~ Eagle Crank & Rods ~ Superchilled
Billet 4L80 ~ 4000 Stall Billet Converter
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May-21-12, 08:42 PM
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#11
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DIY
Real Name: Tony
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Quote:
Originally Posted by lt1z
Is the tune stock?
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from what I know. I bought the truck, it had CAI and light exhaust. I did cat back, plugs, wires but I don't know if it has ever been tuned.
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May-21-12, 08:45 PM
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#12
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DIY
Real Name: Tony
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Quote:
Originally Posted by gn2beatu
If its during accel, then its detonation or cats, dont do that anymore til you get a tuner to log and adjust your tune. BAD things can happen if its detonation. Now if its the cats, no big deal, just remove or replace em. You need to find someone with a scan tool to make sure its not detonation before you do that anymore. G/L
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Yeah, I don't notice any power loss when it happens, it just makes me back off a bit cause it feels like if I don't, it will get worst. I should add that its also at high RPM's. Going to take it in to get tuned asap, was hoping to wait till after the efans, 160 stat and header installs were done... 
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May-22-12, 04:38 AM
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#13
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Real Name: Tom
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I would double check your spark plug wires, make sure they are all on and fully snap in. Did you have this problem be for you did plugs/wires?
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May-22-12, 07:19 AM
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#14
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illegitiminoncarborundum
Real Name: Matt
Member # 64
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Quote:
Originally Posted by ObseSSion07
from what I know. I bought the truck, it had CAI and light exhaust. I did cat back, plugs, wires but I don't know if it has ever been tuned.
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Get the tune looked at immediately and put a colder plug in it.
__________________
08' C6 M6 743/647
93' Z28 A3- in pieces
06' RCSB H/C
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