Loud exhaust. WHY!?!?!
Thread Starter
Instructor
Joined: Jan 2002
Posts: 227
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From: CA
Loud exhaust. WHY!?!?!
Recently when driving the Vet there has been alot of rumbling "exhaust" noise coming from under the car at high RPM's (about 2000+). When cruising on the highway at about 60-70mph with the cruise control enguaged, after about 30 mins. the "Service Engine Soon" comes on and if I accelerate or decelarate the "Service Engine Soon" light goes out. I pulled the codes a while ago and it had something to do with the O2 sensor. Is the cat clogged? What could it be? Thanx everyone!
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Race Director
Joined: Mar 1999
Posts: 16,950
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From: Stafford, Virginia Kittah, Kittah, Kittah...
Re: Loud exhaust. WHY!?!?! (C490Vette)
Is the code for high IAT temp??? If so you could have a clogged cat... It happened to me on my old 88 IROC with TPI setup... The clogged cat didn't make any noise in my car, but it did cause high backpressure which forced the EGR valve to stay open accounting for the high IAT code...
Pro
Joined: Jan 2003
Posts: 669
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From: memphis tn
Re: Loud exhaust. WHY!?!?! (wake)
Is the code for high IAT temp??? If so you could have a clogged cat... It happened to me on my old 88 IROC with TPI setup... The clogged cat didn't make any noise in my car, but it did cause high backpressure which forced the EGR valve to stay open accounting for the high IAT code...
Team Owner
Joined: Sep 2001
Posts: 62,160
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Loud exhaust. WHY!?!?! (neverendingproject)
To me, that sounds like a EGR problem. The other sensors dont operate any differently at speed, but EGR is one that comes up in hwy driving.
