Blazer wont start unless jumped

Tiny
JOHNNYSILVERWOLF
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 4.3L
  • V6
  • RWD
  • AUTOMATIC
  • 175,000 MILES
Ok brand new 550 CCA battery new battery terminals it will turn over and tries to crank then I put battery charger on it for 3 to 10 sec and it cranks then I take the charge off switch the blazer off and it'll crank like 3 or 4 times in a row then it goes back to trying to start add jumper cables to other vehicle cranks right up in 3 to 10 seconds runs fine except for a slight skip turn it off does the same it's like it needs extra boost to crank but I know that's not right can you give some idea where to start?
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Saturday, February 27th, 2016 AT 9:50 AM

6 Replies

Tiny
JDL
  • EXPERT
Use a digital multimeter across battery posts, what is the reading with engine cranking, no jumpers. The generic specs says it shouldn't drop below 9.6 volts. Cranking is starter motor action, not starting. Not only make sure battery has a full charge, make sure battery connections are all good, no voltage drops. With vehicle cranking, the systems get battery voltage, with vehicle running, the systems get alternator voltage, can be several volt difference, if charging system is working properly.

If it cranks good but won't start, have a helper crank it while you check for spark at the plugs, if spark everywhere, use a gage and check proper fuel pressure and check fuel injector pulse. Any applicable trouble codes?
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Saturday, February 27th, 2016 AT 10:13 AM
Tiny
JOHNNYSILVERWOLF
  • MEMBER
While it was running had advance auto do battery alternator, starter pull check system checked fine switched off again would not start, turn over fine battery checked again fine turn blazer over as soon as battery charger attached started fine did another diagnostic check system is green all fine
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Saturday, February 27th, 2016 AT 12:33 PM
Tiny
JDL
  • EXPERT
I can't use what somebody else told you. If it cranks good but won't start, do you have good spark everywhere, if so do you have proper fuel pressure and injector pulse. You need to do some testing. Ok, so the battery and charging system are working great, why do you need the jumpers? Because of a voltage drop issue or a component that needs a little extra kick in the britches. My first thought would be the fuel pump, that is just a guess. If you have a spider fuel system, that system is noted for problems.
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Saturday, February 27th, 2016 AT 2:12 PM
Tiny
JOHNNYSILVERWOLF
  • MEMBER
Ok don't know why it posted three times but ok just thought I'd let you know I had a brain far and decided to change out the magnetic pick up in the distributor after I I checked the core pack it's started on the first try and so far so good guess it was sticling r going bad core pack was good by the way
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Saturday, February 27th, 2016 AT 2:12 PM
Tiny
JOHNNYSILVERWOLF
  • MEMBER
I was wondering if that was all it was I really wish I knew for sure but I will keep checking other comp but so far it's cranking and running thanks for being here for the helping hand
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Saturday, February 27th, 2016 AT 2:17 PM
Tiny
KEN
  • ADMIN
Please let us know what you find so it will help others that come to the site
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Thursday, March 3rd, 2016 AT 9:17 AM

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