Question about Cars & Trucks
Run fault codes and replace the faulty components. quick check run power and earth leads directly from the battery to the fans to ensure they are not seized up then work back checking relays and fuses.
Posted on Apr 21, 2013
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Posted on Jan 02, 2017
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Jul 29, 2013 | Cars & Trucks
Jun 11, 2012 | 1999 Audi A6
May 02, 2012 | 1983 Toyota Pickup
Sep 01, 2011 | Mazda 626 Cars & Trucks
Apr 18, 2017 | 2001 Volkswagen Golf
Thermal failure is most often caused when excessive raw fuel
comes into contact with the catalyst, and "burns" in the converter instead of in
the engine. The high quantity of fuel generates temperatures well in excess of
the capacity of the converter, causing meltdown of the ceramic monolith. The
melted ceramic could block the exhaust path, leading to a significant loss of
engine power. Visible symptoms include heat-related discoloration of the
Potential causes of thermal failure include: misfire,
malfunctioning oxygen sensor, fuel delivery issue, improper choke
setting/operation, and ECU malfunction.
A plugged or contaminated substrate can be the result of an overly rich air/fuel mixture, radiator sealant, and oil or antifreeze entering the exhaust flow. The resultant carbon deposits restrict the operation - and ultimately the flow characteristics - of the converter by coating the unit's reactive surface. This degrades the converter's ability to perform its chemical conversion process, leading to potentially illegal levels of HC, CO, and NOx.
Root causes of this problem are a malfunctioning O2 sensor,
plugged or inoperable fuel injectors, piston blow-by, leaking head gasket,
broken or frozen choke or carburetor float, excessive cranking time, and
repeated incidences of running out of gas.
Thermal shock occurs when a fully heated converter suddenly is
"cold-quenched," such as coming into contact with snqw or ice. This leads to
sudden contraction of the converter housing, which can cause cracks and
disintegration of the ceramic substrate. Symptoms include a "rattling'' sound
when the converter is tapped with a fist or mallet (monolith-type converters
Physical damage, caused by running over road debris, collisions and other impacts, is usually easy to diagnose. This type of damage can break up the ceramic substrate or cause restriction that changes the flow characteristics of the converter or impacts the efficiency of the catalyst.
Jul 06, 2011 | 2003 Mercedes-Benz C-Class
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May 15, 2010 | 2001 Volkswagen Beetle
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