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George H.
George H., ASE Certified Technician
Category: Cadillac
Satisfied Customers: 18817
Experience:  ASE Master Tech 15+ Years
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Cadillac Deville DTS: 2000 Cadillac Deville 140,000 mi. Irregular

Customer Question

2000 Cadillac Deville 140,000 mi. Irregular missing at idle. Changed plugs, boots, and coil packs.
Submitted: 1 year ago.
Category: Cadillac
Expert:  Dan replied 1 year ago.
Hello, my name is***** the check engine light on? Thanks
Customer: replied 1 year ago.
Customer: replied 1 year ago.
Any ideas?
Customer: replied 1 year ago.
Can I expect any more help from you to my question?
Expert:  Dan replied 1 year ago.
Have you cleaned out the throttle body? Does it run fine at highway speeds? Thanks.
Customer: replied 1 year ago.
Yes, Throttle Body was cleaned. Runs fine at highway speeds. Also, I ran a test at Oreilly (see attached).
Expert:  George H. replied 1 year ago.
Hello, different expert here, Can you have them show that first screen at idle and you spray some carb cleaner at the bottom of the bellows between the throttle body and the intake manifold? If it changes the O2 readings drastically the rubber boot is leaking and needs to be replaced. Let me know if you can do this Thank you