Question about 2000 Cadillac DeVille
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Posted on Jan 02, 2017
P0404 EGR valve problem
Change the Exhaust Gas Recirculation valve.
This valve puts some of the exhaust gas back into the engine to cool combustion (to reduce spark knock) and lowers HC (emissions).
Posted on Aug 17, 2009
check out this tool. Brand new on the market and it quickly can diagnose a misfire from the plug or the coil pack. Here's their website
Posted on Sep 03, 2009
SOURCE: change oxygen sensor
Under hood, center, front engine area, above exhaust
pipe flange, mounted in exhaust manifold
Under hood, center, rear engine area, above exhaust pipe flange, mounted in exhaust manifold
The oxygen sensor may be difficult to remove when the engine temperature is below 120°F (48°C). Excessive force may damage the threads in the exhaust manifold of exhaust pipe.
NOTE A special anti-seize compound is used on the oxygen sensor threads. The compound consists of liquid graphite and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If an oxygen sensor is removed from the engine and if for any reason, it is to be reinstalled, the threads must have this anti-seize compound applied before installation.
Fig. Location of the rear O2 sensor
Fig. Location of the the front O2 sensor
Fig. Use a wrench or special socket to loosen the O2 sensor
Fig. When replacing or reinstalling an oxygen sensor, be sure to lube the threads sufficiently
Posted on Jan 19, 2010
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