: 1993 Cadillac sts 4.6 idle fluctuating



savage3000
10-20-09, 02:17 PM
I start my car in the morning idle goes from 1000 to 2500 RPM S I'd tried puting it in gear cannot drive it tell about 20 minutes and it goes back down to normal I replaced the ISC and it still does the same thing can anybody please help me I would like to thank you now for your help.

Ranger
10-20-09, 03:56 PM
Look for a vacuum leak. Maybe around the intake manifold cover.

savage3000
10-21-09, 10:50 PM
Ranger thank you very much for answering my question but I've found what was making my rpm to go up and down it was the gray wire in the plug that plugs into that EGR I've been reading so many of the same symptoms and no one has ever gave this answer. Ranger I believe you are the smartest person on this whole site and most responsible person I wish the rest of the people would follow in your footsteps

Ranger
10-22-09, 10:56 AM
Thanks, but you give me FAR more credit than I deserve. There are several people here who probably are more knowledgeable than I.

Pete315
10-26-09, 03:25 PM
got similiar problem. where is the EGR on these northstars? when you said the gray wire in the plug was bad, was it a vacuum gray wire or an electrical gray wire?

Ranger
10-26-09, 05:11 PM
The EGR is to the right of the TB when looking over the drivers side fender. Big black canister with a plug on top.

Krashed989
10-26-09, 06:33 PM
This os on my 94. Your 95 looks the same but without all the plastic stuff over it.

http://i29.photobucket.com/albums/c296/Krashed989/100_0347.jpg

Pete315
10-27-09, 12:52 PM
thanks, Ill check it out.