My car is making a weird noise. When I am going about 40 and I let off the gas it makes some weird poping noises and it sounds like it is coming from the muffler. I have a magna-flow exaust. I hope someone can tell me what that noise is and what I can do to make it stop!

Thanks

 

Mine was doing so as well. I removed the AIR pump system this past weekend and now the popping is gone. I think it's a defective diverter valve in the AIR system (where the two electrical connectors go).

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89 GTA
305 TPI
WC 5spd w/3.45 rear
Accel Cap & 8mm Taylor's
MSD6A Ignition
Accel Supercoil
Custom Cold Air Induction
Jet Airfoil
K&N Airfilter
160 deg stat/fan switch
Hypertech Thermomaster Chip
Steel Rad
Cat back 3" Exhaust
HiGh FlOw Dynomax Cat

 

back pressure?

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1991 Z28 Camaro L98
5.7 T.P.I
. (350)


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