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My truck tries to start, but does not start?

Tiny
JOYCE HARRIS
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
My truck tries to start, but does not start. I installed a new fuel pump (in tank), checked plugs, checked all "firing" items. I would like to know if a bad oil pump will prevent it from starting. I was told that could be a safety device. I would like to know before purchasing and installing a new oil pump. Thank you.
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Monday, April 25th, 2016 AT 5:17 PM

18 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
That engine should not have an oil pressure fail safe. I just tested the oil pressure on a 2005 6.0L Cadillac Escalade and it still started and ran with no oil pressure feedback just fine. Have you checked for codes yet? Also, does it have spark and the correct fuel pressure? You checked both of those?
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
JOYCE HARRIS
  • MEMBER
  • 10 POSTS
I checked the fuel pressure; it is good 56 pounds of pressure. I am going to replace the ignition module next, I guess. I have not used an analyzer yet for codes; I plan to do that within the next couple of days. Will keep you posted. Thanks for your input.
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Firing module? Have you checked for spark yet?
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
JOYCE HARRIS
  • MEMBER
  • 10 POSTS
I think my husband has; he says it tries to turn over but just does not make it. That is what he said. He is gone right now; I will ask him again when he gets back. Thanks so much.
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,663 POSTS
Hi Joyce, it sounds like it could be the crank angle sensor. here is a guide on how to replace it:

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

Let me know what you find out.
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
JOYCE HARRIS
  • MEMBER
  • 10 POSTS
Okay, will do. Thanks
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
JOYCE HARRIS
  • MEMBER
  • 10 POSTS
My husband has purchased the crank angle sensor but has not installed it yet. After he read the installation instructions, he said that is the same thing I have bought already and has not installed yet. Great minds think alike! We will let you know what happens after he gets it installed. Thanks!
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
Please do.

Thank you
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
JOYCE HARRIS
  • MEMBER
  • 10 POSTS
My husband has installed the crank angle sensor BUT he has not attempted to start truck because the instructions that came with the sensor days this sensor requires a "crank relearn" procedure which requires a scan tool capable of this function. He does not have one of these scan tools, which he understands is expensive. Do you think it would be OK to try to start it without doing this procedure or should he not chance it?
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
You can start it up right now they just want you to have the new sensor relearned. From the vechiles I have changed the sensors on I haven't really ran into any issues from not relearning the sensor. Only when reprogramming the engine computer then I really had to learn it or it would set a code in the computer.
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
JOYCE HARRIS
  • MEMBER
  • 10 POSTS
Great! He says he will try cranking in the morning -- he has quit for the day! Will let u know what happens. Thanks so much.
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
JOYCE HARRIS
  • MEMBER
  • 10 POSTS
Well, my husband bought a new starter and installed it today and then tried starting the truck. Nothing happened at all ! Didn't even try to hit. So, guess he will have to get a tester or get someone to bring one here to see what it might show. Do u have any other suggestions?
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
SATURNTECH9
  • MECHANIC
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So why the new starter?You said it was cranking fine-
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
JOYCE HARRIS
  • MEMBER
  • 10 POSTS
No, it wasn't cranking; it was trying to crank or "hitting", as he calls it, now and again. But it never actually cranked. He is thinking it might be in computer since he has replaced all those other things. Got to get the testing taken care of; will let u know.
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
You originally said it was trying to start to me means it's cranking over. So have you tested the battery cables corrison on the cables made sure the cables were tight etc?Do all the dash lights come on the dash when turning the key on?
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-1
Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
SATURNTECH9
  • MECHANIC
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Firing module?You haven't checked for spark yet?
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
JOYCE HARRIS
  • MEMBER
  • 10 POSTS
Well, my husbands nephew is a mechanic who has a tester and he came yesterday and checked out truck. He reset what all would need resetting and truck really tried to start but just wouldn't. Sounded Everything was checked again and reset again; same thing happened. So, husbands brother is coming today, who is a retired machinist, to see if he can find anything. Will keep u posted.
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Wednesday, September 2nd, 2020 AT 1:12 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
So is the engine turning over normally like when trying to start it normally?So the mechanic couldn't find anything wrong with it?
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Wednesday, September 2nd, 2020 AT 1:12 PM

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