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?
Thanks

 

its the egr and yes a tune will fix it

 

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.

 

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?

 

on a 93 and obd1 its very unlikely to throw a code for no cat.

 

eh, didn't notice it was a 93. mines a 97, it would.. lol

 

So would it have to be the EGR?

 

No use in speculating. Flash the trouble codes on the dashboard via the paperclip trick.

 

Whats that?