2001 Oldsmobile Silhouette 3.4 V6.
Pressure Regulator,thermostat at 200,000 miles,new spark plugs at 190,000 Miles, fuel pump at
175,000. Just started to research.
Question:
Starts then will die. If started and the throttle is slightly press down it will stay running. If I release
on the pedal the rpm drops to 500 then lower and dies. While driving and coming to a stoplight at
20mph the rpm again will drop below 500 and die. Slowly releasing the pedal below 1000 rpm and
above 500 rpm. Trying to hold it steady it will start to search. With the amount of miles I am
guessing it might be the TPI. Any help would be great.
Answer:
Thank you for the tip / donation. A couple of things to look for.
Make sure the air duct between the air filter and the engine throttle body are tight. If loose, this can
cause your problem. Also check the breather tube from the top of the duct to were it attach to the top
of the rear valve cover under the ignition coils assembly. Never real tight in the v/cover, but snug.
Also check for vacuum leaks.

These things could cause this problem, as well as possibly setting a lean oxygen sensor code. The
other possibility is the Idle Air Control (IAC) valve is carboned up. It is on the back side if the throttle
body- -4 wire connector, 2 TORX screws hold it on.

Suggest remove the valve and clean carbon from valve and its bore, as well as cleaning the throttle
body plate and bore. Do not move the IAC valve in and out as this may cause it to bind and not
function, just clean it. Low speed coolant fan wont come on until about 226 degrees.I will send a
resistance chart in a few moments for the coolant sensor.

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Oldsmobile Silhouette RPM Drops Low At Idle