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FIXITMAN, Master Technician
Category: Cadillac
Satisfied Customers: 17409
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cts: my 2006..misfire when i first start..spark plug..same problem

Customer Question

hi, my 2006 caddy cts misfire when i first start in morning change spark plug but still doing same problem. please can u help me. thank u
Submitted: 7 years ago.
Category: Cadillac
Expert:  FIXITMAN replied 7 years ago.
Hello JACUSTOMER, does the vheicle run fine when the engine warms up? Is the check engine light coming on?
Customer: replied 7 years ago.

no engine light on car run better when hot but problem still there mechanic check my car with scanner said everything is ok, but every day when i start my engine shake like need tune up.

Expert:  FIXITMAN replied 7 years ago.
How many miles are on the vehicle? Does the engine run fine at higher speeds?
Customer: replied 7 years ago.
39.000 m yes car run better at high speed
Expert:  FIXITMAN replied 7 years ago.
Okay. THe two most common causes of this are a dirty throttle body or dirty injectors. I would start by spraying out the throttle body with throttle body cleaner and then wiping it out. This should clear up the problem.