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Old 10-31-2012, 06:27 PM
 
Location: Wartrace,TN
6,885 posts, read 10,955,854 times
Reputation: 13728

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I have a 2003 Chevy Silverado that has been acting up lately. In the morning it takes three or four seconds of turning the key to get it started. After it has run it starts right up.

A second thing I noticed is the idle will increase by about 100 rpm every once in a while while idling.

Any idea what to check out? I am going to take it to AutoZone to scan the codes but thought someone might have experienced something like this.

One confession- I haven't changed the air filter in quite a while. While it looks clean (white) it may be clogged with pollen. Would this cause the problems?
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Old 10-31-2012, 08:08 PM
 
Location: Eastern Washington
15,884 posts, read 51,463,615 times
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I doubt the air filter is the problem. How many miles on this rig, how many since the last time the plugs, fuel filter, O2 sensor were changed?

You have a check engine light on or not?

The long crank on cold makes me think that if it has a fuel pressure accumulator, and I don't know about this particular truck, but if it does that may have failed.

The 100 RPM "blip" in your idle may be a separate problem. Maybe idle air control valve needs cleaning. May be your A/C compressor cycling if you are using defog/defrost - in which case it may be normal.
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Old 11-01-2012, 05:49 AM
 
Location: Wartrace,TN
6,885 posts, read 10,955,854 times
Reputation: 13728
Thanks Mitch.

Idle- It is only a small variation that may be due to the defrost since I just started noticing it in the past week as ice has been frosting the windows in the morning so I have been running it.

I do have a check engine light on (the reason I wanted to have AutoZone check the codes for me).

I was thinking the fuel line was losing pressure too since it only has trouble if sitting overnight.
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Old 11-01-2012, 10:53 AM
 
6,368 posts, read 15,526,278 times
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Central Port Injection is very sensitive to fuel pressure. If the fuel pressure spec is 60lbs, it won't start with 55lbs.

Not saying you need a fuel pump. There are other things that can cause fuel pressure to drop.

Google Chevy CPI or spyder fuel injection testing. There's plenty of info out there.

They're also known for ignition rotors causing starting problems.
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