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08-19-2011, 10:18 PM
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#1 |
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Registered User
Join Date: Jan 2011
Location: Mesquite, Tx
Posts: 34
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Need some help BAD!!
93 GMC Sierra (3500 w/ a 5.7). I drove to work this morning... no problems at all. Get ready to go to lunch and my truck won't start. It cranks but won't start. After work, I checked for spark, no spark. So I go to the parts house and I replace the ignition coil and the ignition module. Still no spark. I start looking around trying to figure out why, and notice that I got no fuel to the TBI either. Now I'm stumped. The fuel pump is pumping to the throttle body but nothing is spraying through the injectors. Now I got no spark and no fuel. What could it be? Any suggestions would be greatly appreciated.
Posted via Mobile Device Last edited by jddstat; 08-19-2011 at 10:20 PM. Reason: Spelling |
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08-19-2011, 10:40 PM
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#2 |
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One day...
Join Date: Apr 2008
Location: Tuttle, Ok
Posts: 9,240
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Re: Need some help BAD!!
Have you checked the power at the injectors?
Just throwing some thoughts at the moment. Edit_ sorry re read it. Check for power getting to the coil and module with the key on. I have gotten a bad coil before that was new. Also check the plugs at the coil to make sure they make a good connection. Last edited by scotts62; 08-19-2011 at 10:44 PM. Reason: oops |
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08-19-2011, 10:48 PM
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#3 |
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Registered User
Join Date: Jan 2011
Location: Mesquite, Tx
Posts: 34
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Re: Need some help BAD!!
I checked all that and still nothing. Any chance... just throwing ideas around... the computer went bad? It's been extremely hot here in Dallas for the last 40 plus days over 100 degrees. could heat fry a computer?
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08-19-2011, 10:54 PM
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#4 |
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One day...
Join Date: Apr 2008
Location: Tuttle, Ok
Posts: 9,240
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Re: Need some help BAD!!
Not generally but you never know. I wouldnt go out and buy one without testing a bit though. They are about $100
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08-19-2011, 10:56 PM
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#5 |
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One day...
Join Date: Apr 2008
Location: Tuttle, Ok
Posts: 9,240
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Re: Need some help BAD!!
oops hang on trying to get a diagram working..
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08-19-2011, 10:57 PM
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#6 |
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Registered User
Join Date: Jan 2011
Location: Mesquite, Tx
Posts: 34
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Re: Need some help BAD!!
my dad has exactly the same truck, down to the trim. They were bought by the company i work for and were bought exactly alike. They sold them and i got one and my dad got one. I'm going to take his to test my truck.
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08-19-2011, 10:58 PM
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#7 |
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Registered User
Join Date: Jan 2011
Location: Mesquite, Tx
Posts: 34
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Re: Need some help BAD!!
Thank you.
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08-19-2011, 11:02 PM
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#8 |
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One day...
Join Date: Apr 2008
Location: Tuttle, Ok
Posts: 9,240
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Re: Need some help BAD!!
Try this, kinda hard to look at but could help
http://alldatapro.com/alldata/PRO~V2...47947/41862886 Also check the grounds next to the water neck (on bolted on it) and there is one on the passenger side firewall that goes to a stud right to the computer i believe. Last edited by scotts62; 08-19-2011 at 11:09 PM. Reason: added |
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08-19-2011, 11:10 PM
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#9 |
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Registered User
Join Date: Jan 2011
Location: Mesquite, Tx
Posts: 34
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Re: Need some help BAD!!
will do. I got my boss to let me borrow a company truck for the moment. I had to leave my truck at the shop. I will be going tomorrow to work on it some more. I will let you guys know what i figure out or i will be back here asking more questions.
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08-20-2011, 10:08 AM
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#10 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
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Re: Need some help BAD!!
Work on the no spark issue. The injectors not spraying is related to no spark.
The computer needs to receive a distributor reference pulse from the distributor module to trigger the injectors. The system should produce spark regardless of the condition of the ECM. The ECM can affect the timing but there should still be spark. See if when the key is on there is power to the pink wire to the coil, terminal 3 (C111 – 12040705), in the link Scott posted.
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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08-22-2011, 11:06 PM
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#11 |
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Registered User
Join Date: Jan 2011
Location: Mesquite, Tx
Posts: 34
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Re: Need some help BAD!!
Found the problem!! The pick up coil was the bad part in this puzzle. Thank you all for all the help.
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08-23-2011, 09:46 AM
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#12 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
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Re: Need some help BAD!!
Glad to hear things worked out, and thanks for letting us know what the problem was.
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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