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Taking longer to start

 
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LSdriver
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PostPosted: Wed May 11, 2011 7:43 am    Post subject:  Taking longer to start Reply with quote

2004 Impala LS 3800

Bought my first Impala in February of this year and it always started great.

Turn the key and the car used to fire right up, now you can count to 3.
Since the temperature outside has come up to around 10 degrees celcius the car has a much longer start than I've seen previously.

I have new plugs/wires and this only happens on the first start of the day or if it has been sitting all day after the first start.

Any ideas
Thanks
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davidhoutz
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PostPosted: Wed May 11, 2011 7:46 am    Post subject:   Reply with quote

I'd check the battery.
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LSdriver
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PostPosted: Wed May 11, 2011 8:11 am    Post subject:   Reply with quote

When you turn the key the engine turns over right away but turns over many more times than before, would that still be the battery

Once the engine has been running when you turn the key it fires up right away.
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bbengineer
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PostPosted: Wed May 11, 2011 8:15 am    Post subject:   Reply with quote

It sounds like the fuel is bleeding down after sitting for an extended period

You can put a fuel pressure gauge on the fuel rail and see what's going on...

I would check for a bad FPR, a leaky injector(s), or a fuel pump on its way out

There is an outside chance it could be the MAF on the way out too..

That's where I would start

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LSdriver
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PostPosted: Wed May 11, 2011 1:33 pm    Post subject:   Reply with quote

How would I check each of these things?

For the FPR i tried this: http://armbrust.dyndns.org/tips/vehicles.html

What psi should the pressure be on the FPR and should the engine be off with key in on position?

For the fuel pump is there a way to check the voltage and what should it be? I changed the fuel level sender about 6 months ago and the pump appeared ok.

As for leaky injectors would i detach the fuel rail and turn the key to on with the engine off and see if they are leaking? I would likely need new "O" rings upon re-inserting the fuel rail?

For the MAF I've read that you can clean it

Could this be a fuel filter problem? I don't think it would be as the problem is only on starts after the car has been sitting.
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billy101
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PostPosted: Wed May 11, 2011 6:00 pm    Post subject:   Reply with quote

I have that same issue in the mornings unless I do the following, and it's really quite simple.

Turn key to "ON". you'll hear the fuel pump prime.
wait till priming is done, and then turn key...I do that with mine and it's usually a lot quicker to start.
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LSdriver
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PostPosted: Thu May 12, 2011 11:34 am    Post subject:   Reply with quote

billy101 wrote:
I have that same issue in the mornings unless I do the following, and it's really quite simple.

Turn key to "ON". you'll hear the fuel pump prime.
wait till priming is done, and then turn key...I do that with mine and it's usually a lot quicker to start.


Gave this a try didn't seem to work for me
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edscrogg
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PostPosted: Thu May 12, 2011 3:32 pm    Post subject:   Reply with quote

same issue on my 03'. Useually letting the fuel pump prime helps but not always. The issue tells me that something in the system is not holding the pressure when you shut off the engine. I replaced the fuel filter and it helped a bit, but still takes a few revs to start. I would start by disconecting the fuel filter, and putting a pressure guage there, turn key to on, let pump presure up, then turn key off and watch guage, if it stays then reconect fuel filter and move the teh fuel rails. test the line coming in and just keep moving down to the injectors untill you find the pressure leak
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LSdriver
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PostPosted: Thu May 12, 2011 10:26 pm    Post subject:   Reply with quote

I'll have to give this a try..

this sounds ridiculous but I tried changing the fuel filter a few weeks ago and could not get the fuel line nut or the filter to turn without wrecking the nut on the fuel line. I used tons of penetrating oil; probably doesn't help that i don't have a hoist
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PostPosted: Fri May 13, 2011 3:19 am    Post subject:   Reply with quote

LSdriver wrote:
I'll have to give this a try..

this sounds ridiculous but I tried changing the fuel filter a few weeks ago and could not get the fuel line nut or the filter to turn without wrecking the nut on the fuel line. I used tons of penetrating oil; probably doesn't help that i don't have a hoist


You have to use two wrenches to loosen it.

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LSdriver
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PostPosted: Fri May 13, 2011 7:43 am    Post subject:   Reply with quote

i know i used two wrenches, but its rusted solid and the nut on the fuel line is becoming malformed
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scott37300
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PostPosted: Tue May 24, 2011 8:20 pm    Post subject:   Reply with quote

I would say FPR, they are known to fail on these cars. I know someone that is a mechanic for the city's cop cars with the 3.8L and he said they are know to leak down. He had one that was leaking and he said if the car sits for a while and the battery gets low at all it can actually pile enough fuel on the valves and cause an explosion. He said they had three 00's and one 04 blow, here is a picture from him.

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LSdriver
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PostPosted: Wed May 25, 2011 1:25 pm    Post subject:   Reply with quote

good to know, thks
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