Question about 1998 GMC Sierra
98 4wd gives these codes. the converters are punched out. are there any disadvantages to this? A scan tool test caused these trouble codes I think, the bank 2 sensors output should change slower than bank one sensors if im reading correctly. Does this affect any other systems operation. I'm also getting a constant p0440 and haven't tracked that down yet
Code P0440 EVAP system malfunction conditions.possibles causes fuel filler cap loose damaged or missing.fuel tank pressure sensor damaged or failed.fuel tank vapor lines clogged disconnected purge valve vapor line clogged damaged disconnected.purge or vent solenoid power circuit is open check fuse the charcoal canister could be loaded with fuel. you have to replace catalyst converters cant gut them out if both failed you have engine mechanical problem causing rich fuel mixture loading up gas in both converters causing them to burn out.make sure engine well tune check for intake leaks weak ignition spark.
Posted on Nov 18, 2013
Here are some solutions to your codes and possible causes, maybe you have seen these pages already. when you say the converters are punched out, does that mean there are holes in them? a scan tool does not cause trouble codes, it detects them.
Posted on Nov 18, 2013
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Posted on Jan 02, 2017
Track the p0340 first camshaft timing is very important and could possibly cayse your other codes,Call your local GMC dealer I think I remember a bulletin about this code.
Posted on Aug 23, 2009
SOURCE: i have a 2001 yukon
po 0102 is mas air flow sensor maf/vaf
p0171 bank 1 too lean
p0174b bank 2 too lean
What you have here is either a defective mass air flow sensor and or a possible broken loose or rotted vacuumn line or hose creating this havov, with the engine warm and idling in Park tap the air flow sensor in its housing and see if the engine gets upset(rough) if so replace the sensor its expensive.
If ok have the vac system checked for possible leaks in the hoses at around the intake manifold gasket area etc, fix and replace as needed.
Posted on Nov 05, 2010
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