runs rough cold but fine after warmup
#1
runs rough cold but fine after warmup
I have a 2002 Sierraa 1500 with the 4.8 engine with 120,000 miles. I have been expereancing rough idle and increase reveing when temps get below 50 degrees. After a short time and the engines warms the truck runs great.
I have replaced the air intake sensor, the coolant sensor, new fuel filter, plugs, removed and cleaned oxegen senors and cleaned the throttle body but none of these has worked. Please help. Thanks
I have replaced the air intake sensor, the coolant sensor, new fuel filter, plugs, removed and cleaned oxegen senors and cleaned the throttle body but none of these has worked. Please help. Thanks
#2
If you have replaced the IAT then you mean you have the replaced the whole Mass Air Sensor? When you cleaned the throttle body did you take it off or leave it on and just spray it? If you take it off you can inspect the IAC valve and lots of times it will gum up and get sticky.
#5
I have a 2002 Sierraa 1500 with the 4.8 engine with 120,000 miles. I have been expereancing rough idle and increase reveing when temps get below 50 degrees. After a short time and the engines warms the truck runs great.
I have replaced the air intake sensor, the coolant sensor, new fuel filter, plugs, removed and cleaned oxegen senors and cleaned the throttle body but none of these has worked. Please help. Thanks
I have replaced the air intake sensor, the coolant sensor, new fuel filter, plugs, removed and cleaned oxegen senors and cleaned the throttle body but none of these has worked. Please help. Thanks
https://www.truckforums.com/forum/sh...ad.php?t=15197
Thread
Thread Starter
Forum
Replies
Last Post
robertbassin5
Chevy Silverado/ GMC Sierra Forum
29
12-03-2010 11:39 AM
eaa1964
Chevy Silverado/ GMC Sierra Forum
10
09-21-2010 06:10 PM
eaa1964
General Motors Tech
1
05-21-2006 03:19 PM