» » »

Chevrolet Q&A

Ask Your Question

2003 Chevrolet Tahoe Question: Check Engine Light

 

Question

coski, Fort Collins, CO, April 08, 2009, 15:34
 Rookie

If the outside temp drops below 35 degrees our check engine light comes on and our Tahoe will die when idling. No mechanic can figure out what the problem is. We have changed all o2 sensors, mass air flow, spark plugs...any ideas on what might cause this problem?

1 Answer
Flag This
  • Answer #1

    Russ April 10, 2009, 15:28
     Master

    What code is stored in the system causing the check engine light to come on? A dirty throttle body can cause a low idle and stalling condition.

    Flag This
  • Reply

    coski, April 10, 2009, 16:23
     Rookie

    I do not remember the exact code error...it is always the same and relates to low fuel in bank one and bank two. After all of the previous fixes the same error still occurs.

    Flag This
  • Reply

    Russ, April 13, 2009, 20:26
     Master

    It sounds like your engine is running lean when it is very cold outside. Does the engine stall right after you start it or after the engine is warmed up? It could be that the coolant or air temp sensor is reading incorrectly but not out of spec enought to set a fault code. A quick check would be to look a scan tool data before starting the engine when it is 35 degrees or less and see if the temp sensors are reading the correct temperature. When the engine is cold both temp sensors should read ambient air temperature.

    Flag This
  • Reply

    Visitor, October 02, 2010, 11:00

    MINE does this too! The Chevy garage said it needed new plug wires, so I forked out a fortune to have that done. They also replaced the compressor (it was making a terrible noise). Still NOT fixed. They said it had a leaky hose, and wanted another $600 to fix it! My husband threw a fit, and said there was NO way it needed new plug wires. He gave the chevy garage a piece of his mind, they wouldn't try to fix it, even after they were wrong about what was wrong with it. Winter is coming, the temp went down to 40 yesterday evening, and it started acting up. AND to top it off, my driver side window won't go up anymore, it will go down, but not up!

    Reply
    Flag This