replaced idle control sensor no vaccum leaks but truck will not idle when the engine is cold?
My car has 270000 miles.
My car has an automatic transmission.
Hi there - given your repairs already, I would suspect a fuel-related issue, specifically the engine coolant temperature sensor (for engine management, not the gauge). If a faulty temperature signal is sent to engine management, the engine may not be getting a rich enough mixture when cold. This kind of failure is masked when the engine warms up - engine will run fine when hot. I would recommend an inspection of engine sensors to resolve the poor cold running you are experiencing by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.
Have a car question? Get free advice from our top-rated mechanics.
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%