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1999 Chevy Truck no start

Tiny
CHEVYC15
  • MEMBER
  • 1999 CHEVROLET TRUCK
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
350 vortec with no problems ever simply wouldnt start this morning.
checked fuel pump. Pressures up fine to 60 psi
has spark to plugs
just dead on cranking.
suspect prob is at intake. Anyone seen this prob?
Wednesday, November 12th, 2008 AT 10:18 PM

12 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Did you check for injection pulses-injector/s might not be opening and closing due to the computer is missing an ignition reference signal and not schronizing the injector/s or no power to the injector/s and the computer ground drivers-
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Thursday, November 13th, 2008 AT 3:25 AM
Tiny
CHEVYC15
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  • 10 POSTS
Replaced ecm
replaced cps
new plugs
with borrowed shop scanner hooked up entire time it still shows no injector pulse. Cant locate prob?
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Thursday, November 13th, 2008 AT 4:24 PM
Tiny
CHEVYC15
  • MEMBER
  • 10 POSTS
Scanner has not showen icm prob but we are going to replace that anyway. Based on your suggestion rasmataz regarding ignition signal.
Will keep posting until prob is solved so that at least it will help someone else one day.
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Thursday, November 13th, 2008 AT 4:35 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Thank you Sir-This is how we learn to teach the rest in here-I'll be waiting-let me know the verdict
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Friday, November 14th, 2008 AT 4:21 AM
Tiny
CHEVYC15
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  • 10 POSTS
Icm replaced. Still no pulse
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Friday, November 14th, 2008 AT 8:40 AM
Tiny
CHEVYC15
  • MEMBER
  • 10 POSTS
Compression shows 140 psi
node lights lit up like a christmas tree at the block connector. Still no start.
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Friday, November 14th, 2008 AT 10:35 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The CPS tells the computer to tell the ICM to fire coil. Do you have power to the coil
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Friday, November 14th, 2008 AT 2:35 PM
Tiny
CHEVYC15
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  • 10 POSTS
Yes. Awesome spark. Now pulling top cover off to check injectors by eye
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Friday, November 14th, 2008 AT 7:03 PM
Tiny
CHEVYC15
  • MEMBER
  • 10 POSTS
All replaced components mentioned above were purely hit and miss.
Ok.
Injectors are delivering fuel. Replaced top cover with new gasket set and reassembled components.
Still no start!
Makes no sense. So with 2 of us stumped ( I have 20yrs and larry 30+yrs) make a call to a GM tech
we know. He's interested and comes over.
He goes through everything again and is just as mystified!
Sit back with a crown and coke each
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Saturday, November 15th, 2008 AT 10:41 AM
Tiny
CHEVYC15
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  • 10 POSTS
Larry jumps up walks over to the truck unplugs the coolant temp sensor gets in turns the key and it started.
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Saturday, November 15th, 2008 AT 10:43 AM
Tiny
CHEVYC15
  • MEMBER
  • 10 POSTS
For those of you that dont know where this $12 component is. It sits to the left of the egr in front of the thermostat housing.
Disabling this sensor will enrich the mixture more.
At this point we are leaning toward possible fuel pump even though it pressures up fine.
However it is starting now like it should with the coolant temp sensor reconnected.
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Saturday, November 15th, 2008 AT 10:50 AM
Tiny
CHEVYC15
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  • 10 POSTS
Correction to post about icm.
I mistyped that statement. Should have read.
Replaced icm STILL HAVE pulse.
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Saturday, November 15th, 2008 AT 10:54 AM

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