Engine will crank but no start - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 06-21-2011, 10:27 PM
pokeypokey06's Avatar
pokeypokey06 pokeypokey06 is offline
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2005 Chevy TrailBlazer LS
Summit White 4.2L I6 4X4
Join Date: Jun 2011
Location: Berlin, WI
Posts: 23
Engine will crank but no start

Hi new to this just bought a 2005 Chevy TB. I have had it for a few weeks with no problems. Now yesterday i parked it shut it off and went to start it and it cranks, but will not fire. The kicker is that the previous owner installed a new fuel pump. I dont know if it is the pump or something else. I would not think a pump would fail that fast? Dont know what to do?
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  #2  
Old 06-21-2011, 11:25 PM
christo829's Avatar
christo829 christo829 is offline
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2004 Chevy TrailBlazer LT
Silverstone Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: Fairfax, VA
Posts: 1,298
Do you hear the pump prime up for about two seconds when you turn the key to Run
(not all the way to start)? If not, check for power to the pump (are you comfortable
around a volt meter?). If you do hear it prime, check your fuel pressure. Some auto
parts places have a fuel pressure gauge you can borrow or rent, or you can track
down an independent mechanic to check it for you.

Did your CEL ever come on? Most of the other things that might keep the truck
from running, like ignition/timing failure, would most likely throw a code.

How long ago did the previous owner replace the pump? Did they use an OEM pump,
used, or ? A co-worker just had the pump in his wife's minivan die after 10,000 miles.
He bought a cheap pump as a quick fix, and paid for it early. One day it worked, the next
it was dead.

If you have no power, check fuse, relay, wiring harness, plug, ground.
If you've got power, the pump whines, and you have no pressure, it's most likely the
pump. If you have power and the pump doesn't whine, it's most likely the pump.

Verify the fuel supply, and if it checks out OK, we can try to figure out where else to look.
If it cranks, then you need fuel and spark. Even if the mixture is wrong, you should
get something, even a sputter. You could verify spark with a quick hit of starter fluid.
Not much...shouldn't take much, and some of those are not good for sensors and such,
but if a quick hit of starter fluid gets the truck to run, you've got spark, so it's down
to fuel supply.

Good Luck!

Chris
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  #3  
Old 06-22-2011, 01:35 PM
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pokeypokey06 pokeypokey06 is offline
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2005 Chevy TrailBlazer LS
Summit White 4.2L I6 4X4
Join Date: Jun 2011
Location: Berlin, WI
Posts: 23
Engine will crank but nto start

When it happened it could hear the fuel pump kick in for a couple of seconds. It did this a couple times but still would not start. Nowwhen i turn the key on it does not kick on. The owner put the pump in less then 1,000 miles ago. I dont want to pump another one in and have it fail right away. Any thoughts?
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