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Discussion Starter #1
Ok, i just got my exaust done two weeks ago. I went with 2.25" inch cat back to a straight through bosal muffler. It sounded good, the engine sounded smoother. I just changed my spark plugs the other day from bosch platinums to ngk's instead. I looked at the manual and i gapped them between .031 and .035 like it said. WEll, my exaust would start a constant popping sound if i was giving it light gas between 2500 ro 4000 rpms or so. Also, when idling, the car has intermitten popping as well. You can actually feel the pulses from the exaust in the gas pedal when its popping. I regapped the plugs to what my bosches were at and it seemed to alleviate the problem, but now its back. I dont understand what the deal is and i hope that maybe u guys do. Any help would be appreciated. thanks in advance.

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1992 NX2000
White
K&N Cone intake, Bosal Performance muffler and 2.25" cat back
 

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Did you have a resonator of any kind installed after the cat and before the muffler?

This is only an assumption:

The engine might be backfiring. Many aftermarket exhausts that are straight through will do this. It sounds like yours is a straight through design w/o the resonator.

I have a Thrush glasspack 2.25" installed where the factory resonator is. It is a 20" canister and the overall length is 25". Fit perfectly on the G20 and should fit perfectly on the NX as well. I have no issues with it backfiring or 'popping'.

My previous car, '91 NX2000 has a 2" Borla and no resonator. It would pop every so often, but not all the time or at idle. Usually when I would stomp on it then left of the gas pedal quickly. Or when downshifting.

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Brandon
'96 G20 ($tillen/K&N intake, '91 intake cam, 17 degrees, custom 2.25" Borla cat-back exhaust)
 

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Discussion Starter #3
Well, i dont have a resonator on yet, so maybe that is the cause of it, but would the absence of that really cause the sputtering of popping that i get when im at 2500 or 4000 under light throttle?? thanks again.

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1992 NX2000
White
K&N Cone intake, Bosal Performance muffler and 2.25" cat back
 

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Discussion Starter #5
yeah, but its annoying while cruising in 5th gear or any gear for that matter between 2500 and 4k because of the pulsation i feel in the gas pedal...help is appreciated!! thanks!

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1992 NX2000
White
K&N Cone intake, advanced timing 17* Bosal Performance muffler and 2.25" cat back
 

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i want to remove my valve cover and look for sludge, and ****. I doubt i have any, but i want to see...my car still has the nice amber color to it's oil, it's great...but i want to see if that caky sludgy substance is there like i've heard...my question...if i remove the valve cover, do i have to use a torque wrench when i'm tightening the bolts for it again? because i don't have one...i guess i'll have to get one if i do..

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Aztec Red 1993 NX2000
 

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<font face="Verdana, Arial" size="2">do i have to use a torque wrench when i'm tightening the bolts for it again? because i don't have one</font>

Uh? What does that have to do with exhaust popping?

Should post a new thread for a new topic, but YES you will need to torque them down, unless you want to have the possibility of head gasket leakage. Or even worse, you over torque them and break off a stud.


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Brandon
'96 G20 ($tillen/K&N intake, '91 intake cam, 17 degrees, custom 2.25" Borla cat-back exhaust)
 

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<font face="Verdana, Arial" size="2">Well, i dont have a resonator on yet, so maybe that is the cause of it, but would the absence of that really cause the sputtering of popping that i get when im at 2500 or 4000 under light throttle?? thanks again.</font>
Unfortunately, that is where I am lost too. I couldn't tell you why it 'pops' at idle or light throttle. Unless there is a slight leak at or near the rear muffler section. That would cause a popping sounds and vibrate through the body.

Check the weld on the muffler to see if it is still sealed, or, if they used clamps on it, check to see it is still clamped down securely.



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Brandon
'96 G20 ($tillen/K&N intake, '91 intake cam, 17 degrees, custom 2.25" Borla cat-back exhaust)
 

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now on the West side!
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no, this is a different popping noise...i have the popping noise you are talking about. the one that NismoNX2000 is referring to is more like a snap, crackle, pop, repeat.....
 
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