Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
this sounds as if you may have a weak fuel pump,[common problem with this vortec]..you need to check the fuel pressure,these must have no less than 60psi at all times..you also need to scan the computer for codes,i would think you are getting a p0300[missfire]code,,if you don't have an obd2 scanner,auto zone and most parts stores will scan it and give you the codes for free
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CIRCUIT DESCRIPTION When you turn ON the ignition, the vehicle control module Vehicle Control Module (VCM) energizes the fuel pump relay which powers the fuel pump ON. The pump remains ON as long as the engine is cranking or running and the VCM receives reference pulses. If there are no reference pulses, the VCM shuts the fuel pump OFF within 2 seconds after the ignition was switched to the ON position or if the engine stops. The VCM also turns ON the fuel pump for 2 seconds when you turn OFF the ignition.An electric fuel pump pumps the fuel through an in-line filter to the fuel meter body assembly. The pump attaches to the fuel level sender assembly inside of the fuel tank. The fuel pump provides fuel pressure above what is needed by the fuel injectors. The pressure regulator keeps the fuel available to the injectors at a regulated pressure. Unused fuel returns to the fuel tank by the fuel return pipe.
. After a couple of months of doing it about 1 out of 10 trips, the torque converter went out and spun a bearing in the transmission. I took it to a good mechanic who rebuilt the transmission. In about a month, the noise was back and after 20,000 miles on the new transmission, the new torque converter went out. I took it to a different guy thinking the first had missed something. The new guy rebuilt the transmission, and plugged it in to diagnostics. It showed only mass air flow out of range. That has been about a month ago, the noise is back. Is the mass air flow causing all this tranny trouble?
the mass is not causing the trouble
tell me,when does it make this noise?does it make this noise sitting still in drive?
tell me all you can
can you tell if the noise is coming from the front of the trans or near the rear?
will it whine,while sitting still?
this is a tough one......this sounds as if the rear planet may be worn just a little,and may have gotten missed by the transmission guys..if it is the rear planet,it will get worse over time..if it were the converter,it would whine in drive while sitting still
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