View Full Version : rough idle

11-30-2001, 08:32 PM
as of right now, i have a 95' GMC Jimmy with a 4.3 l v6 CPI. It runs great right now but it idles somewhat rough in the morning and also when you leave the car sitting for a while. I was just wondering what may be the problem to the rough idle. Keep in mind that it only idles rough for less then 10 minutes when it does idle rough. I just want to keep the motor running perfect so when I go to sell the motor in a few months to get the v8, it will be running perfectly.:confused:

12-01-2001, 02:43 AM
it could be your valves need adjusting not enough oil when starting causes rough idle or your choke could be sticking.

12-01-2001, 10:18 PM
I would look into the choke more then the valves. The valves will not take 10 min. to have oil lubricate them. If you have a buddy that works in a shop that has a scan tool, that I feel would be a good place to start. If the scan tool comes up with a code it may give you a better idea on where to start looking.

12-04-2001, 10:45 PM
could also be carbon build up in the EGR Valve...