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Posted on Jan 02, 2017
SOURCE: 2004 CHEVY AVEO THROWING CODES P0700 TRANSMISSION CONTROL SYSTEM,P0300 RANDOM MISFIRE DETECTED, P1781 ENGINE TORQUE SIGNAL CIRCUIT. CAR RANDOMLY DIES DRIVING ON THE HIWAY, PULL OVER,STOP RESTART CAR G
there is a Technical service bulletin for this problem, the number of the TSB is 01575, TSB Date:January 1, 2004
It has to do with engine valve seating problems.
Posted on Jun 03, 2009
IF YOU GOT CYLINDER MISFIRE.OR OPEN FUEL INJECTOR.THAT WILL CAUSE THE PCM TO ENRICHEN FUEL MIXTURE.TO ADJUST TO DEAD CYLINDER.WHICH ACT AS A LARGE VACUUM LEAK.THATS WHY YOUR EXHAUST TAIL PIPES HAS A RAW FUEL SMELL AND WHITE SMOKES.
Posted on Sep 03, 2009
Check your bank 2 plugs for colour (do they look hot like they running hot ). Check you EGR Exhaust Gas Recirculation valve (looks like a 80mm diameter spaceship with a vacuum line to the top of it) If this remains closed the engine runs very hot and causes misfire. Possible causes are EGR not opening are 1) perforated diaphragm 2) encrusted valve stem 3) clogged exhaust gas feed pipe. A quick check for function: run the engine and remove the vacuum tube. The engine note should change as the tube is connected and then disconnected. Also pushing on the underside of the EGR with your fingers to lift the diaphragm to open the valve should also result in change in engine note. If its not working just disassemble the EGR and clean with carb cleaning spray, also clean the exhaust gas feed pipe likewise.
Posted on May 04, 2010
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