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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Check engine light

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Old Aug 16, 2010 | 12:18 AM
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Default Check engine light
I just got long tubes put on my 1993 z28. The 02 sensors are in place but I blocked off the Egr. I drove it for a few days and my check engine light came on tonight . Is this from the egr delete?Or from not running a cat? Will a tune fix this?
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Old Aug 16, 2010 | 12:23 AM
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its the egr and yes a tune will fix it
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Old Aug 16, 2010 | 12:25 AM
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egr, and not running a cat will both throw codes, chances are it's from both.
and a tune will fix these codes from being thrown if you get them tuned out.
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Old Aug 16, 2010 | 12:28 AM
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Ok thanks guys. Ill order a tune from pcmforless. Its a 93 so Ill have to order a chip. Thanks for the help. But why would the check engine light come on after 3 days and not right when they got put on?
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Old Aug 16, 2010 | 12:33 AM
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on a 93 and obd1 its very unlikely to throw a code for no cat.
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Old Aug 16, 2010 | 12:36 AM
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eh, didn't notice it was a 93. mines a 97, it would.. lol
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Old Aug 16, 2010 | 12:38 AM
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So would it have to be the EGR?
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Old Aug 16, 2010 | 01:01 AM
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No use in speculating. Flash the trouble codes on the dashboard via the paperclip trick.
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Old Aug 16, 2010 | 02:01 AM
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Whats that?
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Old Aug 16, 2010 | 02:08 AM
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