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07chevy 2500 hd starting issue..please help
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Chevyfreak1
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Jul 19, 2014, 9:59 AM
Post #1 of 23
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07chevy 2500 hd starting issue..please help
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I have a 2007chevy2500 hd 6.0 it cranks and runs fine when cold but when it gets warm it cranks over 4 or 5 times and I cut key off and it turns over three or four more times and cranks and runs fine mechanics around here are parts changers .I need someoneto chime in that understands engine diagnostics..I have changed and did the following new fuel pump ,fuel pump reg it's built on the pump ac delco. Fuel pump relay .cleaned maf and throttle body. Evap purge solenoid and evap canister and solenoid .just cannot figure out anything else it could be it doesn't throw any codes. I have money but just hate to waste it on parts changing that don't help truck has 60000 miles thanks any help or suggestions would be appreciated
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kev2
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Jul 19, 2014, 11:12 AM
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Re: 07chevy 2500 hd starting issue..please help
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The use of a professiona; scanner is important - we want to see ALL modules.
check fuel pressure - yes I saw you had a new fuel pump. check fuel pressure anyway.
Tell us - is vehicle STOCK? no aftermarket parts ie remote starter or added alarm?
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Chevyfreak1
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Jul 19, 2014, 11:19 AM
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Re: 07chevy 2500 hd starting issue..please help
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I checked it it was a little over sixty with key on. I was wondering if could be crak sensor or something else it runs great I pull my bassboat with no loss of power ..I can't explain it
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Chevyfreak1
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Jul 19, 2014, 12:31 PM
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Re: 07chevy 2500 hd starting issue..please help
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The vehicle is stock ..
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Discretesignals
Ultimate Carjunky
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Jul 19, 2014, 12:44 PM
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Re: 07chevy 2500 hd starting issue..please help
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Was that the fuel pressure when the problem was occurring?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Chevyfreak1
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Jul 19, 2014, 12:45 PM
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Re: 07chevy 2500 hd starting issue..please help
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Not sure a mechanic was checking it and said it wouldn't hold what should it be off and running
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Chevyfreak1
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Jul 19, 2014, 1:25 PM
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Re: 07chevy 2500 hd starting issue..please help
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He put a airtex pump on it 1st and it didn't fix it I checked pressure then it was dropping 7 psi in 5 min they went back and put a Delphi in it and now its back to its old tricks ..it cranks fine when I first get in it then i drive it for a little bit and cut it off and go to crank again it acts up once it cranks it run fine as far as I can tell...
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Discretesignals
Ultimate Carjunky
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Jul 19, 2014, 1:36 PM
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Re: 07chevy 2500 hd starting issue..please help
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The fuel pressure needs to be verified while the problem is happening.
Those symptoms don't sound like fuel is bleeding back into the tank. If you have delayed starting after the vehicle had sat overnight, that would be a more likely scenario for excessive fuel drain back.
If you still have excessive fuel pressure bleed off when you shut it off, then you might consider something such as a leaking fuel injector.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 19, 2014, 1:42 PM)
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Chevyfreak1
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Jul 19, 2014, 1:39 PM
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Re: 07chevy 2500 hd starting issue..please help
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Wouldn't the truck smoke real bad if the injector was leaking that is when u start it ..that just what I read somewhere I am not disputing your word I appreciate your input on this matter..
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Chevyfreak1
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Jul 19, 2014, 2:58 PM
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Re: 07chevy 2500 hd starting issue..please help
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My fuel filter is built on to fuel pump assembly doesn't have one on the frame rail...could a crank sensor also cause this or a throttle pos sensor without throwing a code.
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Discretesignals
Ultimate Carjunky
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Jul 19, 2014, 3:18 PM
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Re: 07chevy 2500 hd starting issue..please help
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It's possible, but if the crank sensor wasn't working when it got hot, you wouldn't have spark or injector pulse.
You would need to verify cam and crank sensor signals at the PCM using a oscilloscope or graphing multimeter while cranking the engine while the problem was happening to verify signal integrity. You also might be able to watch RPM data on a scan tool data stream to see if the PCM is getting RPM information from the crank sensor.
A TPS sensor wouldn't cause something like that, unless it was showing WOT during cranking putting the PCM into clear flood mode. If it were doing something like that, which is rare, you would see that in the scan tool data stream.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 19, 2014, 3:21 PM)
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kev2
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Jul 20, 2014, 4:27 AM
Post #14 of 23
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Re: 07chevy 2500 hd starting issue..please help
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you must exhaust the BASICS before replacing components...
ok vehicle is stock great
fuel pressure is 60psi thats good
what was the result of scan?
lets try a fuel pressure leak down- key on observe pressure rise- key off observe if pressure drops. post results
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Chevyfreak1
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Jul 20, 2014, 6:16 AM
Post #15 of 23
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Re: 07chevy 2500 hd starting issue..please help
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Iam going to take it to a mechanic that supposed to be good so everyone says tomorrow. Ill let y'all know what. They say ..if they don't find it I don't know what I am gonna do i just can't understand why it cranks fine first thing then after you let it get up to operating temp it want s to act up cranking ...
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kev2
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Jul 20, 2014, 7:43 AM
Post #16 of 23
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Re: 07chevy 2500 hd starting issue..please help
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it will require testing - as mentioned FUEL leakdown is a possibility the procedure was posted-
SCANNING it is a must do with computer controls- not the same as code reading...
A thought - Important- Does this engine have AFM ?
(This post was edited by kev2 on Jul 20, 2014, 7:44 AM)
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Chevyfreak1
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Jul 20, 2014, 7:45 AM
Post #17 of 23
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Re: 07chevy 2500 hd starting issue..please help
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Whats that (afv)?
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kev2
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Jul 20, 2014, 7:48 AM
Post #18 of 23
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Re: 07chevy 2500 hd starting issue..please help
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AFM = Active Fuel Management
(I corrected typo)
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Chevyfreak1
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Jul 20, 2014, 8:01 AM
Post #19 of 23
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Re: 07chevy 2500 hd starting issue..please help
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I dont think it does thats where it switches from 8 cylinder to 4 cylinder how would u know
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kev2
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Jul 20, 2014, 9:14 AM
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Re: 07chevy 2500 hd starting issue..please help
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I would guess the owner would know-
Otherwise the 8th character of the VIN# would ID the engine.
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Chevyfreak1
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Jul 20, 2014, 9:18 AM
Post #21 of 23
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Re: 07chevy 2500 hd starting issue..please help
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Its a U if that helps haven't had this vehicle along time
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Chevyfreak1
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Jul 22, 2014, 5:30 AM
Post #22 of 23
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Re: 07chevy 2500 hd starting issue..please help
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ok mechanic just called me back he has had fuel pressure gauge on truck keep in mind new delphi fuel pump key on 55 psi key off pressure starts dropping it probably dropped 7 lbs just in a few minutes ...but how does the truck start good when cold the symptoms only occur after it warms up is the engine in a different start mode when its cold...
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Chevyfreak1
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Jul 25, 2014, 3:36 PM
Post #23 of 23
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Re: 07chevy 2500 hd starting issue..please help
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Can I pull the fuel rail an check for a leaking injector myself ..with the key on and system pressurized
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