Question about 2003 Cadillac Deville
The car is idling rough and when mashing the accelerator down to floor
car will shutoff i replace mas in air cleaner hose no change
Check for vacuum leaks around the intake. This is the most common cause for these codes.
Posted on Mar 16, 2009
These are the trouble codes description, well some what gives you a start where to look for... Auto zone will give you a print out of your codes for free in dallas...
P0170 - Fuel Trim Bank 1
P0171 - Fuel Trim System Lean Bank 1
P0172 - Fuel Trim System Rich Bank 1
P0173 - Fuel Trim Bank 2
P0174 - Fuel Trim System Lean Bank 2
P0175 - Fuel Trim System Rich Bank 2
Posted on Dec 18, 2008
I have a 2000 Deville base with the northstart 4.6.....I cleaned, sprayed and even replaced the mass airflow & map sensor and still the same shaking at idle and codes were present. This is a vacuum leak issue no doubt so I removed the intake plenum and noticed that the inner connection hose to the intake fitting had a small crack, clean thorough and check....I had removed twice before I noticed it.....This is the problem you guys..you just cant see it sometimes.,,,,and It worked after replaced,,,then clear the codes......p.s ,and you will had to replace the intake gaskets as well while doing this...it cost me $14.00 and 1hr & 30 mins of my time..
Posted on Aug 19, 2012
I had same codes.. O2 sensors.. Upstream/Downstream. Ran great after 4day I got P1640
Posted on Jun 13, 2016
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Posted on Jan 02, 2017
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