Problem with my 2001 Chevy Malibu V6.
Question = I have an 2001 Chevy Malibu i turn the key but the fuel pump doesn't always kick on i just put new fuel pump sending unit and pick up in it. i am still having same problem. Try to start and it cranks but wont start. After a while i might get lucky and the fuel pump kicks on and it starts. Once it starts its fine till i try to start it again. Can some on please help. Thanks
Assuming you dont have a
security or theft light on, then this sounds like it may be a faulty fuel pump relay. This relay is in the under hood fuse box. Swap it out with another relay if the same type in that fuse box. Have also had faulty fuse boxes themselves. Poor connection inside can cause low voltage to the fuel pump. Would need to have a test light on the fuel pump power feed circuit at the rear underside of the car when it is acting up to see if you have 12 volts. If you do, then it is a ground problem.
Problem with my = 1997 Chevrolet Malibu
3100 V6

GM Computer codes = yes
Work done to repair this problem = the crankshaft position sensor and harmonic balancer has been changed.
Question = after changing the crankshaft position sensor a code stating that the crankshaft position variation was not learned. What does mean and what do i have to do to clear this code so that the engine light will go off?
A code saying that the catalyst efficiency below threshold bank 1. What does this mean and what do i have to do to clear this code so that the engine light will go off
The crank position variance relearn needs to be done with a scanner. The code cannot be cleared until this procedure is done. This needs to be done because of the crank sensor replacement.

Catalyst threshold can be caused either by a faulty Oxygen sensor, or a faulty
catalytic converter. Reading live sensor data and testing of the oxygen sensor would be needed to determine which one is faulty.
Chevy Malibu Theft, Crank Position Variance Learn

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