91 z28 305 headers question

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91 z28 305 headers question

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91 z28 305 headers question - 5/20/2008 9:33:08 AM

mike83camaroBA

Posts: 7
Joined: 3/6/2005
Status: offline if i install headers and get rid of all the smog crap, will me check engine light go on? im not worried about passing inspection i just dont want to drive around with the light on because that would annoy me. any input would be appreciated

Post #: 1

RE: 91 z28 305 headers question - 5/20/2008 11:38:55 AM

blackz87

Posts: 1317
Status: offline If you get rid of what you call" smog crap". I would say yes, the SES light is going to shine on you.

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87 Black IROC-Z28
350 Crate with TPI
original owner

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RE: 91 z28 305 headers question - 5/20/2008 2:04:32 PM

Camaro 69

Posts: 1161
Joined: 10/17/2007
Status: offline A cold engine runs richer (fuel) than a hot engine, so the smog pump injects air into the exhaust manifolds until it warms up to keep the emissions level down. There is also another injector pipe that goes into the cat. converter. On the passenger side, above the valve cover, there is an electrically controlled (solenoid) dual-valve unit that has a plastic cover held on with two tabs both top and bottom. There is also a riser pipe that hangs above the passenger side exhaust manifold that tells that unit when the engine is hot. I plan on taking "the smog crap" out of my 91 as well, mostly for cosmetic reasons. As a test, I disconnected both electrical plugs that go to the solenoids. So far, after two days, still no SES light due to having the electrical connections off. But in theory, now my smog pump should be pumping air in constantly since the solenoids can't switch off the flow. The next step will be to disconnect the hoses, and if it stays all clear, then I know I can safely remove it all. As far as I understand, removing the smog crap shouldn't set off an error code. We shall see.

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RE: 91 z28 305 headers question - 5/26/2008 6:26:02 AM

mike83camaroBA

Posts: 7
Joined: 3/6/2005
Status: offline ok cool, well keep me updated on that one, i also have a question about modifying the stock exhaust. every set of headers i have looked at says if i want to keep the cat i have to modify the stock exhaust has anyone done this yet or do u just take out the cat?

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91 z28 305. stock FOR NOW

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Post #: 4

RE: 91 z28 305 headers question - 6/14/2008 7:08:17 AM

Roy

Posts: 19
Joined: 3/15/2008
Status: offline Mike, I did eliminate all smog and computer input on a ''91 RS by swapping an ''84 305 in place of the FI V6. I did however keep the computer hooked up to control the lockup function and also on the ''91 the speedo must have computer input to register on the guage. Now to your question; yes the light will come on but I removed the instrument cluster and took out the light bulb. I''m not sure how far you want to go with this but I''m very happy with my setup. Your biggest concern will be your engine timing advance/spark knock sensor since you will be removing all the inputs to the system. I have a vaccum advance D.U.I. dist to solve the timing issue.

Call me and I will help you in any way I can.

Roy,
248-807-4056

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Roy F. Satikas

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RE: 91 z28 305 headers question - 6/15/2008 7:50:20 PM

buckfever

Posts: 236
Joined: 11/26/2007
Status: offline
on my 87 my check engine light never came on and i removed every piece of emissions eqipment on my car.

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87 Iroc-Z 305 TPI 5sp headers, flowmaster cat back, Zoom HP clutch w/ kevlar,

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Post #: 6

RE: 91 z28 305 headers question - 6/16/2008 1:35:56 AM

Camaro 69

Posts: 1161
Joined: 10/17/2007
Status: offline Removing the "smog crap" absolutely DOES NOT trip your SES function. I removed my smog pump and all related hoses, plugged the exhaust manifold injector tubes, and my cat fell off too. But if you were to remove the oxygen sensor, then that''s a different story.

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Eats Rice and Poops Out Fords
393 Stroker, Tunnel Ram/Dual Quads, and a well used rear-view mirror

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