Lumpy Idle at Start-Up

[ILoveSun]

Tomorrow will be a week that I've owned my '94 Cutlass 'Vert, and this just started yesterday, and repeated again twice today - once at start-up this morning and again when I was leaving work (the car had sat idle all day).

 

It has the 3.4 and when I start it, it idles up and down for a few minutes, and then evens out.

 

Also, while doing this, it smells as if it's running rich. Any ideas?

 

Thanks in advance,

 

Greg

[19Cutlass94]

Well when the motor is cold, it will run richer. Does it feel like its missfiring?

[ILoveSun]

Possibly, but if it is it is very minor. It tends to idle higher regardless of the ambient temp. It was 89 here today when I got off work and it took a few miles for it to settle into a normal idle.

[19Cutlass94]

That's normal.

[GOT2B GM]

I think he's talking about more of a loping idle.

 

My 1994 CS droptop with the LQ1 also does that on a cold start.

 

Will high idle for a bit (normal cold idle) then as it tries to idle down to a warm idle, it'll lope up and down for a couple minutes, then smooth out at the lower warm idle.

 

Haven't been able to sort it out. My 1995 CS droptop which is identical powertrain wise, does not do it.