 1997 Gmc Sierra Cranks But No Start, v6 sierra crank no start |
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 Dec 17 2009, 09:58 PM
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#1
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Newbie  Group: Members Posts: 5 Joined: 17-December 09 Member No.: 3,225 Make/Model: Gmc Sierra Year: 1997  |
hi everyone my name is diego i got a 1997 gmc sierra vortec 4.3 and it cranks but no start i have had this issue before and it only does it when its cold so i did alittle of diagnosing my self and found the ignition control module was bad so i replaced it and started up and been driving it for awhile and now we got cold weather and its doin the crank no start again so i was wondering if anyones got any advice for me and help me with my beast lol thanx
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Dec 18 2009, 01:01 PM
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#2
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 Crew Cheif/Site Admin  Group: Admin Posts: 2,656 Joined: 21-May 03 Member No.: 3 |
It is likely the fuel pump spray carb clean into the throttle body and see if it starts if so check the filter and if that is OK repkace the pump. 99 times out of a hundred on a vortec it is the fuel pump if they wont start cold. They are fussy on fuel pressure and volumn.
-------------------- ASE Master Tech
Advanced Engine Performance GM & Chrysler Certified Tech DOT Inspector 30+ Years experience Proud Grandfather Retired Tech and small business owner of Service stations and auto repair shops Previous employment as Tech and Service Manager at GM and Chrysler Dealers |
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Dec 20 2009, 12:42 PM
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#3
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Newbie Group: Members Posts: 5 Joined: 17-December 09 Member No.: 3,225 Make/Model: Gmc Sierra Year: 1997 |
ok so i got the carb cleaner and sprayed in the throttle body and still no start so im assuming its a spark issue so im going to check the spark and go from there last time this happened and wouldnt start cold i ended up replacing the inition control module and fix this issue. but im not so sure if thats gonna be the problem again thanx guys any info would be much appreciated.
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Dec 20 2009, 01:11 PM
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#4
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Crew Cheif/Site Admin Group: Admin Posts: 2,656 Joined: 21-May 03 Member No.: 3 |
Did you install an aftermarket module if you in fact have no spark I would check this first I have had bad luck with aftermarket modules about the only other problem that I have seen with this vortec is the cam or crank sensors, and this is rare, it is unusual to see a module go bad. I would give the module wiring and connections a careful inspection if this is your problem.
-------------------- ASE Master Tech
Advanced Engine Performance GM & Chrysler Certified Tech DOT Inspector 30+ Years experience Proud Grandfather Retired Tech and small business owner of Service stations and auto repair shops Previous employment as Tech and Service Manager at GM and Chrysler Dealers |
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Dec 20 2009, 04:42 PM
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#5
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Newbie Group: Members Posts: 5 Joined: 17-December 09 Member No.: 3,225 Make/Model: Gmc Sierra Year: 1997 |
the first time my truck had this problem i purchased a ac delco icm and so to day i went out and bought an aftermarket icm and there is still no spark so maybe a coil? but i have noticed that when i try starting my truck just cranks but no start and so when i release the key back to accessory the motor like jumps like i wanna say if i were cranking the motor over just once , a friend from work said there is a part on the distributor called the pick up coil he said that could be a possibility?
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Dec 21 2009, 07:28 PM
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#6
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Newbie Group: Members Posts: 5 Joined: 17-December 09 Member No.: 3,225 Make/Model: Gmc Sierra Year: 1997 |
ok so my truck has weak spark after replacing the icm any ideas would be usefull thanks
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Dec 21 2009, 09:06 PM
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#7
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Crew Cheif/Site Admin Group: Admin Posts: 2,656 Joined: 21-May 03 Member No.: 3 |
The first cultrip for weak spark is always the coil how weak and what are you using for a comparision you have to be sure you are not seeing the waste spark or the secondary as it is sometimes called this always looks a little on the weak side.
-------------------- ASE Master Tech
Advanced Engine Performance GM & Chrysler Certified Tech DOT Inspector 30+ Years experience Proud Grandfather Retired Tech and small business owner of Service stations and auto repair shops Previous employment as Tech and Service Manager at GM and Chrysler Dealers |
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Dec 21 2009, 09:31 PM
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#8
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Newbie Group: Members Posts: 5 Joined: 17-December 09 Member No.: 3,225 Make/Model: Gmc Sierra Year: 1997 |
ok i got a spark tester with a bulb in it and the bulb barely lights up when my truck is being cranked so i threw the spark tester on my moms tahoe and it lights up bright jusr making sure the spark tester was ok thats what i was thinking to it is the coil is there any way to test the coil to see if its bad
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Dec 22 2009, 09:32 AM
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#9
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Crew Cheif/Site Admin Group: Admin Posts: 2,656 Joined: 21-May 03 Member No.: 3 |
If you catch the right counter guy that is interested in helping not just selling parts a few after market can test coils if you have to pay for diagnostics it is chesper just to repalce the coil. are you sure you had a good ground on your vehicle I have seen this look like low spark. Also if it an older Tahoe it may look like a stronger spark but this is rare
-------------------- ASE Master Tech
Advanced Engine Performance GM & Chrysler Certified Tech DOT Inspector 30+ Years experience Proud Grandfather Retired Tech and small business owner of Service stations and auto repair shops Previous employment as Tech and Service Manager at GM and Chrysler Dealers |
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Feb 13 2010, 07:57 PM
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#10
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Newbie Group: Members Posts: 3 Joined: 13-February 10 Member No.: 3,249 Make/Model: GMC Sierra 1500 Year: 1996 |
QUOTE (Crew Chief @ Dec 22 2009, 09:32 AM)  If you catch the right counter guy that is interested in helping not just selling parts a few after market can test coils if you have to pay for diagnostics it is chesper just to repalce the coil. are you sure you had a good ground on your vehicle I have seen this look like low spark. Also if it an older Tahoe it may look like a stronger spark but this is rare |
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Feb 13 2010, 08:00 PM
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#11
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Newbie Group: Members Posts: 3 Joined: 13-February 10 Member No.: 3,249 Make/Model: GMC Sierra 1500 Year: 1996 |
QUOTE (96gmc4.3 @ Feb 13 2010, 07:57 PM) QUOTE (Crew Chief @ Dec 22 2009, 09:32 AM) If you catch the right counter guy that is interested in helping not just selling parts a few after market can test coils if you have to pay for diagnostics it is chesper just to repalce the coil. are you sure you had a good ground on your vehicle I have seen this look like low spark. Also if it an older Tahoe it may look like a stronger spark but this is rare What was the fix for this? Any help appreciated. Thanks. 96gmc4.3 |
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Feb 14 2010, 11:46 AM
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#12
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Crew Cheif/Site Admin Group: Admin Posts: 2,656 Joined: 21-May 03 Member No.: 3 |
If I remember correctly he had a bad fuel pump but I dont recall for sure. A 4.3 no start is usually caused by the fuel pump the parameters for this fuel delivery system has to be right on to start cold. I will need more info tp help you.
When doesnt it start Have you tried anything Does it have spark and if so have you sprayed carb cleaner into the throttle body mileage can you here the fuel pump run -------------------- ASE Master Tech
Advanced Engine Performance GM & Chrysler Certified Tech DOT Inspector 30+ Years experience Proud Grandfather Retired Tech and small business owner of Service stations and auto repair shops Previous employment as Tech and Service Manager at GM and Chrysler Dealers |
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