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4.3 Vortec Wont start

Re: 4.3 Vortec Wont start

Postby jose1974 » Feb 06 2012, 4:16am

Hello i check compression all are in 120 plus psi timing ok i press the gas pedal a couple times engine is running now little missing maybe i need new plugs again. Fuel pressure 52 with the engine running i have change really nothing other than the plugs and the fuel pressure regulator which dont make any diferent before i know i got a problem where i dont know i am going to turn it off for a bout 30 to see what happen engine is warm now i let u know.
jose1974
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
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Year: 2002
Make/Model: GMC Sierra
Variant: VHO/Vortec Max
Extra Info: 4.3 l v6
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Re: 4.3 Vortec Wont start

Postby ASTE25 » Feb 06 2012, 4:23am

Now that it is running, it would be wise to take it to a shop and have them put it on a diagnostic scanner to see what the sensors are reading.
Jordan
ASTE25
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Re: 4.3 Vortec Wont start

Postby jose1974 » Feb 06 2012, 4:38am

I forgot to tell you i found pleanty info like o2 sensor maf sensor air temp coolant temp bank 1 also the fuel is At 52 psi engine running i never change the cram shaft sensor so i dont know what was wrong. I will take wednesday to put it on the scanner i like to know before i put it on the road in a long trip. Fishing or so.
jose1974
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
Joined: Feb 04 2012, 8:11pm
Years of membership: 2 years of membership2 years of membership
Location: dallas
Year: 2002
Make/Model: GMC Sierra
Variant: VHO/Vortec Max
Extra Info: 4.3 l v6
Group Membership:
Registered users

Re: 4.3 Vortec Wont start

Postby jose1974 » Feb 06 2012, 4:53am

What should i look for?
jose1974
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
Joined: Feb 04 2012, 8:11pm
Years of membership: 2 years of membership2 years of membership
Location: dallas
Year: 2002
Make/Model: GMC Sierra
Variant: VHO/Vortec Max
Extra Info: 4.3 l v6
Group Membership:
Registered users

Re: 4.3 Vortec Wont start

Postby ASTE25 » Feb 06 2012, 6:29am

Just look and see that the sensors are reading in specification. You will probably need a factory service manual as well.
Jordan
ASTE25
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
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Re: 4.3 Vortec Wont start

Postby jose1974 » Feb 06 2012, 6:38am

I just got one from auto zone can that one work? Or i need to get it from the dealer. Thanks
jose1974
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
Joined: Feb 04 2012, 8:11pm
Years of membership: 2 years of membership2 years of membership
Location: dallas
Year: 2002
Make/Model: GMC Sierra
Variant: VHO/Vortec Max
Extra Info: 4.3 l v6
Group Membership:
Registered users

Re: 4.3 Vortec Wont start

Postby ASTE25 » Feb 06 2012, 12:59pm

You will probably need one from the factory. You should be able to find them on line where you can buy them. You may be able to even buy it and download it to your computer. The one from Auto Zone will probably not have the information you need in it.
Jordan
ASTE25
Shifting into Sixth Gear! [L3]
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Joined: Jan 03 2011, 6:37am
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Re: 4.3 Vortec Wont start

Postby jose1974 » Feb 06 2012, 3:51pm

Ok thanks i probably will replace the fuel pump assembly because the pressure is dropping to fast from 62 to 40 fast after the fuel pump cut off i believe the check valve in the fuel pump is no helping i got one new pressure regulator the second one the first was only going 52 psi the one on it now is at 62 so i will buy a new fuel pump delphi FG0053 thanks i let you know what the pressure do after i replace the pump.
jose1974
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
Joined: Feb 04 2012, 8:11pm
Years of membership: 2 years of membership2 years of membership
Location: dallas
Year: 2002
Make/Model: GMC Sierra
Variant: VHO/Vortec Max
Extra Info: 4.3 l v6
Group Membership:
Registered users

Re: 4.3 Vortec Wont start

Postby ASTE25 » Feb 06 2012, 4:23pm

Keep us updated.
Jordan
ASTE25
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 11018
Topics: 19
Images: 5
Joined: Jan 03 2011, 6:37am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: New Market, Alabama
Year: 2015
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Re: 4.3 Vortec Wont start

Postby jose1974 » Feb 06 2012, 5:33pm

I will thanks for the help.
jose1974
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
Joined: Feb 04 2012, 8:11pm
Years of membership: 2 years of membership2 years of membership
Location: dallas
Year: 2002
Make/Model: GMC Sierra
Variant: VHO/Vortec Max
Extra Info: 4.3 l v6
Group Membership:
Registered users
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