Question about 2001 Chevrolet Silverado 1500

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2001 silverado 6.0 v8 starting problem at mid temperature.

Starts normally cold temperature. Starts normally at normal operating temperature. Let sit for an hour and a half, and try to start motor rolls 15-20 times before starting. Have had pressure regulator replaced in truck. Had gm cetified garage check truck out. Cannot find the problem, starting to get worse.

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  • 14 more comments 
  • dennis_raine Feb 13, 2009

    The garage checked the fuel pressure and they said it wasn't the pump. There were no diagnostic codes. I had a check engine light come on, but it was an 0-2 sensor last summer. I replaced the fuel filter and the throttle sensor also.

  • dennis_raine Feb 13, 2009

    The truck was hooked up to a scanner, but I wasn't there at the time. They told me there were no error codes and bring it back when a service engine light came on. The light never came on so I started working on it myself. They told me that the fuel systme did hold pressure. At one time I was feathering the gas pedal, but it didn't seem to help much so I quit doing it.

  • dennis_raine Feb 17, 2009

    Good morning, I changed the map sensor and the water coolant sensor this weekend, and still no luck. I will change the maf sensor next. When I finally get the engine to start, I will let it run a few seconds and shut it off. When I go to restart it, it starts up instantly. I borrowed a fuel pressure gage from a friend and put it on the truck last night. When I turn the key on, I will have around 58psi on the gage. When it is running, it has about 48. I pulled the fuel regulator vacc hose off when it was running, and the hose had good vaccum. I turned off the engine and let sit for about a half an hour. When I came out to check the pressure it had dropped down to 35. Is this normal?



    Thanks:

    Dennis

  • dennis_raine Feb 17, 2009

    Ok I will try that tonight with the spark plug.

  • dennis_raine Feb 17, 2009

    Ok, I will try the spark plug test tonight. The temperature sensor I changed had a plug connector, and it was on the front of the engine above the exhaust manifold. They call it ect sensor in the book.

  • dennis_raine Feb 18, 2009

    Good morning, Last night I took a spark plug out and let the engine cool down to its problem temperature. I set the tip of spark plug to ground and I had my wife roll the starter. The spark plug was sparking the whole time and finally the engine started.

    thanks

    Dennis

  • dennis_raine Feb 18, 2009

    Bill, I will do that and I will let you know what happens. Thank you for all the help.



    Dennis

  • Anonymous Mar 16, 2009

    Hey Bill how's it going? No haven't figured it out yet. I put an "anoid" light on the fuel injector wiring and I am getting the light to blink. As you know I also had the spark plug out and tried starting it and I had spark. I'm kinda thinking it is the fuel pump, but i haven't changed it yet. I have been doing some pressure checks and it is down to about 40lbs when I turn the key on. When it is cold and hot it still starts fine its just that warm temp that is affects it. The chevy garage doesn't even have on of those snap on picture scanners. I'm just burnt out from the whole thing! Wana buy it?

  • bczerkie May 11, 2010

    I just had to buy a new scan tool, I got a cheap actron CP9180 from Advance auto for under $200. It was cheaper than doing an update to my Snap-on MT2500.

    It will print from my PC and it records Movie too!

    If you gonna to do your own work, not a bad investment, But I would hate to tell you to buy it and it not tell you your problem.



    Already saved me many hours and many $$.

    Just curious where you located (roughly)?

    Bill

  • bczerkie May 11, 2010

    Dennis are you going yet?

    if so Please rate Gmelec for his help and I will post a quick note so you could rate me. Thanks Bill

  • bczerkie May 11, 2010

    Can you ask the shop if they can record a movie with their scanner? Snap-on scanner does. What this does is record existing conditions (during no start) in your case, usually other way around, then when the condition changes (starts) they can push a button and you will then have 20 or more frames of no start conditions and then also running frames to compare and see what changed.

    You will have to work with the shop to show them problem.

    This should actually be easy to capture as you know when it going to change, unlike normally sometimes you drive for an hour just to get a slight stumble captured.

    Get a printout if you can, for furture reference.

    Bill

  • bczerkie May 11, 2010

    Sorry can't help with the exacts psi's on fuel pressure question.

    sorry to ask another question, but they all help.

    question I have and i may be wrong, On the tps you replaced did you set it up properly. I am thinking I used to hook up my snap-on scanner and adjust these to a certian minimum setting maybe something like .50 0r 50 ohms ? will someone else confirm or shoot this down,please. I don't have time this morning to check it out and I know you want this fixed.

    MAF When I used to suspect these sometimes I would thump them and see if engine would stumble. A good one never did.

    I know its hard to guess how hard a thump is and how hard of one it would take to damage a good one so be easy. I used end of screwdriver and hit on side like i was killing an ant, not a fly. good description huh?

    I hate seeing spending on these sensors if your not sure, but I did want you to know there is a temp sensor and a fan switch thay look different but make sure they gave you the one you need.

    temp sensor going to computer has weather pack connector and the fan switch used to not have it.??

  • Bruce Bracey
    Bruce Bracey May 11, 2010

    Dennis, I would'nt spend the money on a MAF sensor quite yet. It sounds like you did a good test on the fuel system and it should be OK.

    Next, let start the vehicle and allow it to warm up, shut it off as you did before and wait the 1/2 hour or so until it won't start again.

    Remove a spark plug wire from the coil of spark plug and verify you have spark when the no start condition is happening and we will go from there.

    Let me know.

    Regards,

  • Bruce Bracey
    Bruce Bracey May 11, 2010

    Dennis, bczerkie is correct. I would start looking at the temp sensor but also did the fuel pump pressure leak down or hold steady when the engine was shut off.

    Regards,

  • bczerkie May 11, 2010

    When they had it at shop did they hook up to a scanner?

    I would be interested in seeing the reading from the temp. sensor.

    and others. (MAF Baro Map).

    If bad it would have a default setting that will let it run, but not be adjusting the fuel as needed for all conditions (starting & others).

    You are not pressing the throttle to the floor are you?

  • Bruce Bracey
    Bruce Bracey May 11, 2010

    Dennis, When the fuel regulator was changed, did he perform a fuel pressure check? Where there any diagnostic codes pulled?

    Let me know.

    regards,

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  • Chevrolet Master
  • 1,000 Answers

Dennis, So far you have verified your fuel system is working properly and spark test you performed verifies the ignition system is functioning as it should, you have two of the three needed items finished.
The remaining item to verify will be injector pulse. Without the pulse all the fuel pressure and spark in the world won't allow the engine to start. The reason for this step by step diagnosis is to pin point the system causing the problem.
Then next step will be to purchase or borrow a "noid" light that will tell you if the engine control module is sending the correct pulse to the injectors for fuel delivery to the cylinder.
When the engine is cranking during the "no-start" condition, a good injector pulse will "blink" the light.
Your almost there, good luck and let me know.
Regards,

Posted on Feb 18, 2009

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  • Contributor
  • 35 Answers

On Saturn car it turned out to be a coolant temp. sensor so look there. simple 12 dollar sensor that screws it all up. So i would say look into a coolant temp. sensor

Posted on Feb 14, 2009

  • Nathan Green Feb 14, 2009

    On Saturn car it turned out to be a coolant temp. sensor so look there. simple 12 dollar sensor that screws it all up. So i would say look into a coolant temp. sensor

  • Nathan Green Feb 17, 2009

    well the temp sensor got ride of the continous roll overs now can you smell gas around your truck

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