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Topic: aftermarket exhaust

in Forum: C4 Fuel, Emission Control, and Exhaust Systems

aftermarket exhaust (1/4)
 7/17/17 5:47pm
Nancy L
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Perrysburg, OH - USA

Vette(s):
1996 Collectors Edition convertible, LT1, 300 hp, automatic, Sebring Silver exterior, Torch Red interior, with auxiliary hard top, less than 21K miles


Joined: 1/24/2012
Posts: 2

Need advice from C4 owners.  I have a 1996 Collector's Edition with 22,000 miles.  When I purchased the car second-hand, I really thought it was too quiet - I wanted a little rumble.  I put "cherry bombs" on it and it sounds wonderful, just the way I like it. 
  However, the "check engine" light goes on, I take it to the mechanics and they change the EVG valve and the sillinoid.  This has happened three times already.  Can the "cherry bombs" be causing this?   What can I do to fix it?  Do I take it back to the people to put the exhaust on and see what they say about it?  A friend of mine has a C-4 and he did the same thing, same installer, but there was never a problem with the "check engine" light.



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Re: aftermarket exhaust (2/4)
 7/20/17 8:08am
molotov
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Joined: 7/12/2017
Posts: 22

Hi Nancy..
 
Cherry bombs are quite restrictive and don't do you any favours performance wise. Possibly an O2 cell is causing this as you have two (I think, one below each exhaust manifold on the pipe).
 
Best you find out what the code is that's causing the warning message, as its possibly had a wire moved/damaged etc. when the cherry bombs were fitted.
 
If you disconnect the battery first though for a minute, this will remove any stored codes and you can see if it comes back when you reconnect and start up..
 
Good luck..


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Re: aftermarket exhaust (3/4)
 7/21/17 9:14am
Atchafalaya
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Atchafalaya Basin, LA - USA

Vette(s):
Black 1979 L-82 Black 1996 LT1 Black 1999 Coupe


Joined: 3/20/2009
Posts: 571

stevel98 said: Hi Nancy..
 
Cherry bombs are quite restrictive and don't do you any favours performance wise. Possibly an O2 cell is causing this as you have two (I think, one below each exhaust manifold on the pipe).
 
Best you find out what the code is that's causing the warning message, as its possibly had a wire moved/damaged etc. when the cherry bombs were fitted.
 
If you disconnect the battery first though for a minute, this will remove any stored codes and you can see if it comes back when you reconnect and start up..
 
Good luck..


A ----- Start this procedure in cool, open area.
1 - Disconnect the battery (both posts).
2 - go inside vehicle and turn ON every available accessory ( ignition key, head lights, radio, wipers, fans, etc...)
 
Of course nothing will work; that's not the point.
 
3 - after a few minutes turn OFF every available accessory.
4 - reconnect battery.
5 - start engine and let idle for 10 or 15 minutes.
 
This is a re-learn.
Used to store electricity, capacitors often help computers avoid losing their memory when the battery is disconnected.
The 1996 computer system has several capacitors (even some in the radio).
The purpose of having all components ON while battery is disconnected is to drain the capacitors.
 
Thus removing as much electricity/memory from the 1996 system as possible.
 
 
If a code pops up from this point; it can be read as accurately as possible.
Re: aftermarket exhaust (4/4)
 7/26/17 3:51pm
aeronautic1
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Joined: 7/9/2013
Posts: 4

On my '88 I installed 4" Magnaflows and combined the two cats into on 1 "cat-back." I have never had a check engine light and the 'vette GROWLS.

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