94' 850 Slightly Rough Idle when cool outside

stheis · Post by **stheis** » 03 Sep 2013, 16:35

I've noticed when it's cool outside in the morning, maybe about below 60*F or so, the idle in the car is just a little rough, bouncing around a bit. Doesn't seem to be a big deal, but maybe it's something I can nab early before it's a problem. Anyone had this and figured it out? Thanks again, you guys are awesome!

Post by **Ozark Lee** » 03 Sep 2013, 18:25

Have you read the codes? If this is a turbo they will all be read in port A-2. On a Non Turbo they can be split up between ports A-2 and A-6.

...Lee

Post by **jblackburn** » 04 Sep 2013, 08:44

Temp sensor comes to mind, but start with codes first, if there are any.

If not, test the resistance at the temperature sensor by the thermostat on a cool engine.

* -20C: 16,000 Ohms (16 kOhms)
* 0C: 7,300 Ohms
* 20C: 2,600 Ohms
* 80C: 300 Ohms
* 90C (Operating Temp): 200 Ohms
* 100C: 150 Ohms

stheis · Post by **stheis** » 07 Sep 2013, 09:35

thanks guys, I'll check those options when I have some time but will be a little busy for the next week. I believe it's had that idle issue since I've had it (about 8 months) and I had checked for codes a couple months ago and didn't have any so might be more likely the temp sensor.