20 Most Recent 1999 Chevrolet Silverado 1500 - Page 5 Questions & Answers

Sounds like the chock needs a little TLC.

besides the heated oxygen sensors being faulty, lean mixture codes also refer to intake/exhaust leaks ( cracked flex section of exhaust pipe at manifold , low fuel pressures /pump, faulty injectors , MAF/VAF,wiring and ECM

could be a bad sensor, fuel pressure regulator also recommend checkin fuel pressure for fuel pump and fuel filter

Does the code reader power up ? Does a message no communication show on the screen ? Is there B+ voltage at pin 16 in the DLC ? If all that is good try a auto parts store ,they check codes for free .

you will have to rebuild or replace the transmission if continued to use in damage condition will either destroy transmission or can cause and accident

Have you put a code reader in to help you detect the problem.? I know this sounds silly, but does the horn work? Check the manual for battery relay.

You need to put a scanner on the diagnostic link and see what the code is. Depending on the mileage on the truck you may have a catalytic converter that is plugged. If you remove the 02 sensor ahead of the cat. the truck should start and run, it will run rough but it should start and run and continue to run.

Check the fault codes anyway. Did you do this fuel pressure testing while the loss of power was occurring? If no the test is invalid.

bad fuel injectors or dirty

Can't be to sure with yours. It maybe the switch. On my 2002, I found I had a Transfer Case Control Module issue. Shopped around and found one on Amazon for half the price the local box stores wanted. I would Google this before starting to buy a bunch of parts.

I would think the sender unit is not recording the correct amount of fuel left in tank , have an OBD check done and see if you get any codes to help narrow down the problem

Are you sure the battery is good? You say no power at all. Do you mean lights and everything dim when you do this? If nothing else, try jump starting it.