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Old April 16th, 2007, 08:08 AM   #1
GerkTJ
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I have a 2001 1500HD with a 6.0L and 135000 miles on it. Put new plugs in about 15000 miles ago. When you go to start it it cranks for awhile before it starts. If you stop cranking on it and then start again it fires right up! Any ideas?
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Old April 16th, 2007, 11:05 AM   #2
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That could be about 20 different things.

Does it do it when it's cold?

It could be a number of sensors...IAT, MAP, MAF, CKP. Plugged or dirty injectors, bad plug wires, fuel contamination.....
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Old April 16th, 2007, 06:13 PM   #3
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yes, cold starts are the worst. Once it has been started it seems pretty good. I've noticed it getting worst for awhile now.
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Old April 17th, 2007, 02:54 PM   #4
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Fuel pump on its way out
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Old April 17th, 2007, 10:09 PM   #5
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also check the fuel pressure regulator(on drivers side of fuel rail). take the vacuum line off the top and check to see of there is gas in the line. this would mean the fuel pressure regulator is leaking and causing the fuel pressure to drop off after turned off insted of holding the pressure to start the vehicle again. this is also a pretty common problem
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Old April 17th, 2007, 10:29 PM   #6
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could be the relay. after oil pressure builds it will start by bypassing the relay if it's wired the way a think it is.
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Old April 18th, 2007, 09:57 AM   #7
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The fuel pump completely slipped my mind. Chevy's have always had some issues with their fuel pumps.

If the fuel pump has never been replaced in that 135,000 miles, I'd definitely be blaming the fuel pump. I'd also get the fuel filter replaced.

You can either get it replaced or wait 'til it takes a complete shit.

The reason it's not starting immediately is the way the fuel system is set-up. When the pump is primed it should have the right amount of pressure. If it is a few pounds off, the system won't work until it is at the proper pressure.

So with your problem its taking longer than it should to build the pressure, and that's why it isn't starting right away.
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Old April 18th, 2007, 10:00 AM   #8
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Originally Posted by GreaseMonkey View Post
The fuel pump completely slipped my mind. Chevy's have always had some issues with their fuel pumps.

If the fuel pump has never been replaced in that 135,000 miles, I'd definitely be blaming the fuel pump. I'd also get the fuel filter replaced.

You can either get it replaced or wait 'til it takes a complete shit.

The reason it's not starting immediately is the way the fuel system is set-up. When the pump is primed it should have the right amount of pressure. If it is a few pounds off, the system won't work until it is at the proper pressure.

So with your problem its taking longer than it should to build the pressure, and that's why it isn't starting right away.

or the check valve is stuck allowing all the fuel pressure to return into the tank through the fuel supply line, which also means fuel pump!
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Old April 18th, 2007, 10:03 AM   #9
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A pint of says the throttle body is gummed up. Remove it and clean out the carbon build-up. Also clean the needle of the IAC and seat. DO NOT PUSH the IAC needle back in when removed.

Use a small wire brush and Throttle body/ Carb cleaner.

Fuel pressure could also be the cause, but this is the easiest and cheapest way to start with no fault codes present.
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Old April 18th, 2007, 03:44 PM   #10
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you have given me some good places to check. I'll clean the thottle body first because it's easy and the throttle does stick a little when you open it up from idle. Then i guess the fuel pump will have to come out. it has had an issue with the fuel gauge not working right after you fill it up for awhile now. thanks for the help~!
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Old April 18th, 2007, 07:31 PM   #11
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pull a really thats th same from somewere ealse and swap it thats what it sounds like to me
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