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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 01-09-2008, 11:37 AM
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Hard start first thing

Sorry if this is an old question but the last two mornings my '05 TB with only 11,400 miles has not started on the first try. The sequence has been this:

Yesterday: Turn key to start, engine cranked for 3 maybe 4 secs, did not start - let up on key. Immediately try again, cranks for 2 - 3 secs and fires, runs normal, no missing or anything. Starts normally the rest of the day.

"Normally" means it starts in a 1+ seconds, virtually immediately.

Today: Remembering yesterday, I decide to hold key if it doesn't start and see what happens. So turn key to start, engine cranks for maybe 4 -5 secs, no start. Release key and immediately try again, Engine cranks for 2 - 3 secs and fires, runs fine. Drive to coffee shop, come out half hour later starts just fine.

I'm new to owning a TB but it's almost as if the fuel system has lost its prime.

Question: Does the fuel pump run with key on? If so for how long and should I be able to hear it?

What else might be going on?

TIA
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  #2  
Old 01-09-2008, 03:58 PM
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I think the newer TB are like the Impalas...
you turn the key, crank- the computer gets the signal- and the COMPUTER cranks the engine till it starts....
I think I read TB where doing this now...

next time you can try this in the morning when its been sitting overnight
put key in, turn the key (DO NOT CRANK), then turn off. turn key again, DO NOT CRANK, turn off, turn key again, wait about 2 seconds, and then crank.... does the engine start in the 1 seconds interval?

when you put the key in, and turn, the fuel pump runs for about 3 seconds- it presurizes the lines...
in case you have a leak... turning the key several times will pressurize the lines..
its possible theres no pressure and it wont turn on till gas gets to the engine....

on the TB the pump is quiet... open the door and turn the key- you should hear a faint hum...
you wont hear it if its noisy around you...
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  #3  
Old 01-09-2008, 04:02 PM
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try a jump start.
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Old 01-09-2008, 08:46 PM
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Quote:
Originally Posted by BUC NASTY View Post
try a jump start.
Cranks just fine with not even a hint of a slowdown in cranking speed so I don't think it's that. But it's certainly easy enough to check connections at the bat and alt.
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Old 01-10-2008, 02:19 PM
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OK, this morning I cycled the key from off and on three times, waiting about 3-4 secs with key on each time. I could hear a couple of things run and then go off each time. On the 4th try I went directly to "start" and it started just fine.

So what's going on.

I know one of the service guys at the dealer so will check with him but anything you can add is appreciated.

Thanks,
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Old 01-10-2008, 02:54 PM
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Losing fuel pressure

You're losing fuel pressure from somewhere...could be an injector, fuel line (you'll smell gas), regulator, or fuel pump. A handful of tests will need to be performed in order to pinpoint the decrease
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  #7  
Old 01-10-2008, 03:04 PM
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Yup, I agree. I think my problem is going to be convincing the dealer. That's where knowing one of the service guys will help. I hope.

I'm gonna try a "normal" start tomorrow morning and see if the problem repeats then start callin'.

Thanks,
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  #8  
Old 01-10-2008, 03:21 PM
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alot like my old 67 nova.
let it sit for some time (week) and when you try to restart- its a hassle...
gotta crank it for some time.. while it SUCKS gas from the tank.
sometimes I just pour a little gas in the carb- it starts right up, runs for a few seconds at high RPM... then quits...
upon restart- it cranks a few times and then vroooommmmm,
obviously the previous revving helped bring up some gas...

in your TB case, it is losing pressure somewhere. But in this case. the pump PUSHES gas- (pressurizes it in the lines).
old car pumps SUCKED the gas thru the lines... thats why in hot weather many cars ended up with Vapor lock...
Vapor lock is nonexistant nowadays.
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  #9  
Old 01-10-2008, 04:46 PM
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You must be an old guy. Not many folks talk like that anymore. Vaprolock? What's that?
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  #10  
Old 01-10-2008, 06:00 PM
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34.... i guess it is getting up there.
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