Northstar Engines and System Technical Discussion Discussion, 2002 Eldorado rough idle in Cadillac Engine Discussion; My 02' Eldorado just started idling a little rough. It only had 55K. Do you think it could need plugs ...
Automobile(s): 2002.5 F55 STS, 2014 Explorer XLT 4WD
MD Eastern Shore
Re: 2002 Eldorado rough idle
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