Question about Chevrolet Tahoe

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I have a 97 Chevy Tahoe 4x4 with a 5.7 engine the trouble code P0172 & P0175 Bank system 1 to rich & Bank system 2 to rich what do i need to fix?

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Hey. How many miles on it. If over 100,000, it may need new O2 sensors but unlikely both would go out of spec at the same time. You will need to install a scan tool with data stream abilitys. The pressure regulator could be ruptured which will drastically richen up both banks. If no tool, locate the pressure regulator, usually on the right side at the end of fuel rail. Make sure the vacuum line is attached and pulls vacuum. Unhook the line. The motor should sound very different and then correct itself when hooking the line back up. If there is no vacuum at the line, check for a broken or cracked area. Never overlook the simple stuff. Also need to check coolant temp sensor accuracy. It can be in tolerance but still read incorrect coolant temp. There are numerous other items that will cause a rich condition but check these first. TJ.

Posted on Nov 12, 2009

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Coolant sensor will make your 5.7 run fine when cold ,but once it warms up it will have rough idle when at stop light in or out of gear may smoke black when starting and smell of rich fuel also but other then that will operate fine you can safely replace the sensor and solve the problem

Posted on Jun 03, 2010

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I have before a problem like this and i fix just replace the air filter.clean injector.and clean the intake

Posted on Nov 12, 2009

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