My friend has a 98 z28 and he has the egr blocked off but he didnt delete it out of the pcm he says (just bought the car) and it idles rough for a couple seconds. Would not having the egr deleted out of the pcm cause this?

 

i've heard 10 guys say yes...and 10 guys say no...

i have it deleted on my car but not off the computer and the car seems to run and idle fine.

 

I'd contribute the rough idle to a possible leak around the blockoff.

 

it only does it for a couple seconds tho ?

 

sounds like normal warm up to me...even mine does that...always has.

and the EGR would be running alot longer than a few seconds...like a few minutes would be more like it...so why would taht be the problem.

 

All it does is send a signal to the pcm and it shows a code when its not plugged in[removing the EGR].....I removed the hoses and made a custom bracket to hold the little air pump and left it plugged in...but took out the air & egr hoses, etc.

No SES light at all.

 

Hmmm....that is very interesting