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Chevrolet Repair/2006 Chevy Trailblazer 4.2L

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Question
On the trailblazer when you turn the key to start it, it will crank half a crank and will not turn over at all, I turn the key back and try to crank it again and it is only half a crank again. All the lights and gauges work. The next morning when I tried it started right up, so I move it out of the garage and cut it off and tryied to start it back and it would only do half a crank. Can you tell me what can cause this.

Answer
HI KIM FROM CALIF,WISH I WERE THERE !!!THIS TRUCK HAS A AMP SENSOR ON THE BATTERY CABLE. SO IT KNOWS THAT THERE IS LOW VOLTAGE TO THE STARTER...YOU MAY THINK THE BATTERY IS OK BUT I BET IF YOU JUMP THIS IT WILL START WITH NO PROBLEM AS LONG AS YOU HAVE GOOD CONNECTIONS ON THE JUMPER.. SO IF YOU JUMP IT AND IT STARTS,, GET YOURSELF A NEW BATTERY,,OR BETTER YET TAKE THE BATTERY TO A STORE THAT SELLS BATTERIES AND HAVE THEM CK IT..I THINK THEY WILL TELL YOU THAT YOU HAVE A WEAK BATTERY..ALSO ONCE THIS GETS GOING AGAIN MAY NOT BE A BAD IDEA TO HAVE THE ALTERNATOR CHECKED JUST TO BE SURE THAT IT IS OK AS WELL..THIS WILL CAUSE A WEAK BATTERY IF THE ALT IS NOT CHARGING TO THE CORRECT SPEC. IF YOU HAVE A VOLT METER AND WANT TO SAVE YOURSELF SOME $$$$ HOOK THE VOLT METER UP TO THE BATTERY CABLES START THE CAR UP AND TURN ON YOUR LIGHTS NOW HOLD THE THROTTLE TO ABOUT 1200 RPMS AND THE VOLTAGE SHOULD BE 13.8 TO 14.5 VOLTS ANY THING LESS THEN THAT HAVE THE ALT CHECKED OUT AT A SHOP..BUT YOUR PROBLEM IS MORE THEN LIKELY JUST A WEAK BATTERY....HOPE THIS HELPS YOU AND GOOD LUCK TO YOU,,,TOM..

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TOM SHEETS

Expertise

PLEASE READ ALL OF THIS BEFORE ASKING ANY QUESTIONS. IF THIS CHEVY SECTION IS MAXED OUT.YOU CAN REACH ME IN THE OLDS/BUICK SECTION. Will answer questions from 6:00am to 10:00pm all days [EST][[[ NO DIESEL OR PAINT QUESTIONS]]] will answer all 1965 to present QUESTIONS ON ALL GM'S on mechanics of these cars. Keep in mind i am not there in person i am going on what you are telling me !! PLEASE IF ASKING A QUESTION GIVE ME AS MUCH INFO AS POSSIBLE. THE MORE THE BETTER. SUCH AS YEAR,MAKE,MODEL,ENGINE SIZE. THIS WILL HELP ME HELP YOU. I will not be able to answer all questions because of some situations that i would really need to be there and see things for myself,such as electrical issues. In many cases i would need wiring diagrams. I can also give you an estimate on what the cost would be at our repair shop as an idea to help you. Keep in mind that my answer is ONLY MY ADVICE,ck with your mechanic as well.. >> THANK YOU, TOM..

Experience

I have been a ASE certified master mechanic for over 30 years and certified IN ALL 8 CATEGORIES,[engine repair,engine performance,auto trans,manual trans,clutches,steering and suspension,brakes,electrical systems,heating and air/cond. I am also a state CERTIFIED inspector for over 30 years. I do computer work [pcm]fault codes,pcm flashing,state inspection monitor readiness,repairs on exhaust,fuel service,[injection and carburetor,] charging system problems, running issues,alignments,frame problems,tire balance,struts and of course standard and anti-lock brakes.

Organizations
nys state auto repair industry and ase group.

Publications
N/A

Education/Credentials
high school,4 years of tech school,and many many hours of auto training with many gm classes and aftermarket training classes..

Awards and Honors
ASE MASTER TECH CERTIFIED IN ALL 8 CATEGORIES.NYS INSP LICENSE AND A/C CERTIFIED

Past/Present Clients
MANY CUSTOMERS IN OUR BUSY SHOP.

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