: 2002 Eldorado rough idle

03-19-10, 05:51 PM
My 02' Eldorado just started idling a little rough. It only had 55K. Do you think it could need plugs and wires this soon? There are no engine codes. :hmm:

03-19-10, 06:08 PM
Ripped plenum?

03-19-10, 06:12 PM
No wires - My '02 has 53K and is dead smooth.

Start by checking the air filter, intake ducting, and the connector plenum between the throttlebody and intake manifold - the rubber thingy with the hose clamp around it - not the intake ducting, the intake side of the throttlebody - shoot a tad of choke or throttlebody cleaner down at the bottom of the rubber connector with the engine idling. Any leak there will show up as an idle speed increase.

Here's what's inside/under your coil packs................click the pic

03-19-10, 09:21 PM
Thanks. I will check tomorrow morning and let you know. What should the idle speed be? 800, 900, 1000 rpm?

03-19-10, 10:27 PM
650. Just below the 3rd hash mark (750).