It has rough idle when you first start it then straightens out after warming up

SOURCE: 2001 Oldsmobile Silhouette surging

sounds like the idle air control motor is sticking , not sure what engine you have 3.4 litre ?? also you can ck the throttle plate right on top where the throttle cable bracket assembly part of that bracket holds down a vaccum line that has a rubber gromnet that after time leaks causing idle surge , hope this helps

SOURCE: 1999 Olds Intrigue (3.5 L

crankcase sensor, located behind starter on 3.5

SOURCE: have to hit starter 2-3

When you say you have to "hit" the starter, do you mean literally? If so, then you need to replace your starter. I've had several cars where the starter went out and if you bang on the starter it will usually start up. That wouldn't have anything to do with your fuel pump or idle sensor. Replace your starter.

Marvin

• 85242 Answers
• Posted on Apr 07, 2009

SOURCE: 1993 olds cutlass supreme 3.1 multi port loading up at idle

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

SOURCE: Car runs rough and misfires

if u checked the codes and it showed that a o2 sensor is bad make sure ur on the rite one as in {sensor 1 bank1 or sensor1 bank 2} when u change a sensor always make sure u got the rite one.


hope this helps