Exhaust
I am trying to track down what would overheat my exhaust, engine temp has been a little low (will change the thermostate soon) and te O2 sensor is faulty, would this be the cause or is there other faults that commonly cause an exhaust to run too hot?
your exhaust is supposed to run hot........ its an exhaust
It is not running hot, it is OVER HEATING. there is spots on the mufflers where you can see it has been glowing red hot.
When the exhaust shop replaced my middle muffler today he said he had never seen one get soo hot.
even after he cut it out and it was sitting on the floor for 10 minutes it was still too hot to touch by hand.
No more stupid comments please.
If an exhaust shop says it is too hot then it is running TOO HOT.
It can take over half an hour for a muffler to cool down after its been on a car mate..
the hot spots arnt just tig weld marks right?
Have you checked your error codes?Originally Posted by VR38
Good chance that's it. If your engine is running lean, it burns hotter (or is that rich?).
No, I fitted the exhaust myself not two monthe ago, standard system, at first I thought it was a defective system but as described to me the standard mufflers flow to the back then to two forward chambers then exit. The rear chamber had near burnt thru, totally burnt the alloy coating, the muffler man said for it to burn like that it would have to be red hot.
The rear muffler had these spots on it too, altho not as bad as the middle muffler.
rear muffler is also stock replacement. (origional supplier told me it was sports).
I fitted this system myself so I know what it looked like.
I had the middle muffler replaced with a proper sports one, but damb wish I had of got the right system in the first place.
I sprayed some silver onto the new middle muffler and the rear one for the trip home on the express way but nothing burnt off for the 15min trip.
Would a faulty o2 sensor run lean?
I thought they were programed to run rich if they dropped out?
Yes, a faulty O2 sensor would do that. It could be that because your O2 sensor is faulty, it is giving bad readings that say that it is running normaly. Again, any error codes?
best option is check ya falt codes see if o2 comes up and replace
VS Stato
Soundstream Comp series throughout with 2, 12' subs, 1 4channel amp, 1 mono block, 2 6' splits in front and 6'9 in rear pushing out 148DB. also now running a 2.5 farad capacitor .. and D34 Yellow top
1/4 mile : 593RT Running 15.9's with cat back Exhaust
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on holiday
if the O2 starts to get bad it normally reads to low a voltage so the ecu richens things up to correct it.or they drop out all together.what sort of driving do you do lots of sustained high speed stuff.it could just of been bad muffler design
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
unburnt fuel getting pushed out into the exhaust can cause this to happen
Exhaust Guru
Chances are it was a faulty muffler. Sometimes they stuff up in manufacturing and the muffler has too much restriction. Especially if the heat marks were where the baffles are. Some cheap systems aren't too good either and do that too.
The Wagon on Wheels..
I would be using a heat gun and do some temp checks around the exhaust ports of your heads and compare with another non overheating commodore. If they are the same then its just a poorly manufactured exhaust system causing your worries.
It's cheap and half arsed - perfect fit for a Commodore
Reaper
Exhaust Guru
Just to understand it a bit better....the exhaust hasn't gotten hot since you changed the front muffler?
As said before a restriction somewhere in the system,
but You dont have any signs of a faulty valve in the motor by any chance ?
Correct, but the o2 sensor is still showing code 13, sorry should have been more clearer when I said it was in fault.
Exhaust Guru
Changing the muffler points to that being the problem. A faulty O2 sensor won't cause what you were experiencing.
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