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4.3 Vortec Wont start

Re: 4.3 Vortec Wont start

Postby ASTE25 » Dec 07 2011, 6:23am

Check the plug wires, (correct me if I am wrong, but I think it still has a distributor) cap and rotor button. It sounds like the moisture is causing a miss. With it being so cold when it will not start, you may have a cracked dist. cap that the crack expands in the cold weather. If it has been missing for a while, you could have also killed the catylatic converter.
Jordan
2005 Victory Red Silverado Z-71 4X4 regular cab
5.3 / 4L60E
Warn 9.5 TI winch and a Warn Trans4mer brush guard
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Related Topics  V-6 VORTEC WON'T IMMEDIATELY START.   1991 wont start   truck will turn over but wont start   Cranks but wont start. Fuel problem?   94 chevy silverado cranks but wont start   5.7 Vortec in a 98 Silverado Z-71   Vortec Max   5.7 350 non vortec   1996 vortec 5.7   hard starting vortec   Diagnostic help on 1998 5.7 vortec   Loss of power 4.3L V-6 Vortec   Oil Overfill - Vortec 4300   Engine misfire 97 350 vortec. 
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Re: 4.3 Vortec Wont start

Postby jose1974 » Feb 05 2012, 12:57am

My 02 sierra 4.3l i parke tuesday was good friday it will turn over but it wont start check fuel pressure 62 psi i have fire but engine dont start i believe i have some electrical problem any help be good thanks. Also i check the timing look good i dont know what else to do. Any help thanks
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Re: 4.3 Vortec Wont start

Postby ASTE25 » Feb 05 2012, 4:08am

Sounds like you will have to have a diagnistic scanner hooked up to find out what it is. You only need 3 things for it to run: fuel, fire (in the right time) and compression. I have seen cran and camshaft sensors cause problems similar to what you describe.
Jordan
2005 Victory Red Silverado Z-71 4X4 regular cab
5.3 / 4L60E
Warn 9.5 TI winch and a Warn Trans4mer brush guard
User avatar
ASTE25
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Re: 4.3 Vortec Wont start

Postby jose1974 » Feb 05 2012, 4:16am

well i have one i cant get any code in the scanner i even unplug the cramshat sensor to see, them i got a fault in the scanner i even remove the fuel cap i have a code for that too but still nothing to put me back on running.
Last edited by starspangled6.0 on Feb 05 2012, 4:18am, edited 1 time in total.
Reason: Please don't quote the post directly above yours. It's redundant. Just use the quick reply button instead.
jose1974
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
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Location: dallas
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Make/Model: GMC Sierra
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Extra Info: 4.3 l v6
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Re: 4.3 Vortec Wont start

Postby ASTE25 » Feb 05 2012, 4:22am

Do you have a diagnostic scanner or a code reader? There is a big difference (about a $3200 difference). A code reader will not tell you what you need to know. A diagnostic scanner will.
Jordan
2005 Victory Red Silverado Z-71 4X4 regular cab
5.3 / 4L60E
Warn 9.5 TI winch and a Warn Trans4mer brush guard
User avatar
ASTE25
Automotive Technician
Automotive Technician
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 3329
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Images: 12
Blogs: 0
Joined: Jan 03 2011, 6:37am
Years of membership: 1 year of membership
Location: New Market, Alabama
Year: 2005
Make/Model: Chevrolet Silverado
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Re: 4.3 Vortec Wont start

Postby jose1974 » Feb 05 2012, 4:25am

my scanner tell me the code # and description, also i can reset or delete any code. thanks
Last edited by starspangled6.0 on Feb 05 2012, 4:39am, edited 1 time in total.
Reason: Please don't quote the post directly above yours. It's redundant. Just use the quick reply button instead
jose1974
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
Blogs: 0
Joined: Feb 04 2012, 8:11pm
Location: dallas
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 jose1974 » Feb 05 2012, 4:32am

i only pay like a $100 dollar allways help before i dont know right now i been working on it for a while i am tire i even replace the plugs tomorrow i will replaced the cramshaft, maybe fix my problem, i am open to any sugestion( no code no engine light on nothing, this never happen to me before. thanks
Last edited by starspangled6.0 on Feb 05 2012, 4:39am, edited 1 time in total.
Reason: Please don't quote the post directly above yours. It's redundant. Just use the quick reply button instead
jose1974
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
Blogs: 0
Joined: Feb 04 2012, 8:11pm
Location: dallas
Year: 2002
Make/Model: GMC Sierra
Variant: VHO/Vortec Max
Extra Info: 4.3 l v6
Group Membership:
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Re: 4.3 Vortec Wont start

Postby ASTE25 » Feb 05 2012, 7:17am

A diagnostic scanner (not a code reader) will be able to show you a lot more information than just the codes. You can use it to actually see what sensor is reading what and other stuff besides just pending codes. It will help prevent you from doing what you are doing (throwing parts and money at the problem).
Jordan
2005 Victory Red Silverado Z-71 4X4 regular cab
5.3 / 4L60E
Warn 9.5 TI winch and a Warn Trans4mer brush guard
User avatar
ASTE25
Automotive Technician
Automotive Technician
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 3329
Topics: 5
Images: 12
Blogs: 0
Joined: Jan 03 2011, 6:37am
Years of membership: 1 year of membership
Location: New Market, Alabama
Year: 2005
Make/Model: Chevrolet Silverado
Extra Info: Regular cab Z71 4X4
Group Membership:
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Registered users

Re: 4.3 Vortec Wont start

Postby jose1974 » Feb 05 2012, 7:16pm

ASTE25 wrote:A diagnostic scanner (not a code reader) will be able to show you a lot more information than just the codes. You can use it to actually see what sensor is reading what and other stuff besides just pending codes. It will help prevent you from doing what you are doing (throwing parts and money at the problem).

U are right i will try tonigh went i get off at 7 pm to see what can i get thanks
jose1974
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
Blogs: 0
Joined: Feb 04 2012, 8:11pm
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 05 2012, 9:26pm

OK, let me know what you find out.
Jordan
2005 Victory Red Silverado Z-71 4X4 regular cab
5.3 / 4L60E
Warn 9.5 TI winch and a Warn Trans4mer brush guard
User avatar
ASTE25
Automotive Technician
Automotive Technician
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 3329
Topics: 5
Images: 12
Blogs: 0
Joined: Jan 03 2011, 6:37am
Years of membership: 1 year of membership
Location: New Market, Alabama
Year: 2005
Make/Model: Chevrolet Silverado
Extra Info: Regular cab Z71 4X4
Group Membership:
Automotive Technicians
Registered users
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