Question about 2001 Chevrolet Silverado 1500

2 Answers

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.

Posted by on

  • 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?



  • 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.



  • dennis_raine Feb 18, 2009

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


  • 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)?


  • 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.


  • 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.


  • 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.


  • 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.



2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • 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.

Posted on Feb 18, 2009

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • 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


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

The gas gauge needle on my 2005 Silverado 6 cylinder went completely to the right( stayed there) for about 8 starts and then returned to "normal limits. The weather here has been BITTERLY COLD for the

The fuel gauge isn't affected by the pump. Maybe there's some varnish on the sending unit and when it's really cold it just kinda sticks, then when it warms up it will move again

Feb 13, 2015 | Cars & Trucks

1 Answer

98 silverado 5.7 hard starting when warmed up starts fine cold what could cause this?

check for a bad fuel pump relay. One of the first signs of a failing DME/Fuel Pump is difficult hot starting. Quite often when the DME/Fuel Pump relay starts failing the car will start without problems when it is cold. However, when the car has been operated at normal operating temperature for a while, it will refuse to start. Its worth a try! (usually 30 minutes to 1 hour), the car will again start without problem. Is this the case! Good-Day!

Jul 26, 2014 | 1998 Chevrolet Chevrolet silverado

1 Answer

Water leaking at the exhaust paty

Water leaking from the exhaust when the car first starts. This is normal as the exhaust system is cold and the exhaust fumes contains a lot of water vapour (moisture). This is more noticable during very cold weather.
As your car warm up to normal operating temperature the water vapour is still present but because of the higher temperature you will not see this water vapour.

Jan 28, 2012 | Cars & Trucks

1 Answer

My 2001 2500HD Silverado overheats while towing my travel trailer when crossing mountains. I was told that you can install a "remote" add-on electric fan that has a switch in the cab. When the...

in some cases yes. also you can get a lower temp thermostat that keeps the motor
running at lower temperature also i would check to see at wat temp the fan comes
on that is ware you start. the heavy load will always run your temp up higher

May 29, 2011 | 2001 Chevrolet Silverado 2500HD

1 Answer

I get a clunking noise from the front of my truck when I cold start it and only for a few min as is warms up then it goes away. This started in cold weather 35-60F. I have a chevy silverado 2001 1500...

this engine has forged pistons whitch expand more than hyper-u-tec-tic pistons when heated . this is normal for this engine . my brother has a chevy silverado 2001 1500 4.8Lwith 650,000 kms and he said his made that noise when it was brand new and the dealer said this is normal. the truck still runs like new with lots of power and it still makes that noise before it reaches operating temp then goes away.My brother uses lucas oil treatment and it helps quiet the knock a little when cold.

Jan 03, 2011 | 2001 Chevrolet Silverado 2500

1 Answer

After a cold start, I don't get cabin heat for about 15 minutes. The heat gauge starts at C (cold), rises to normal operating temperature, then rises to just under the H (hot) for about 30 seconds, at...

Check for low coolant, you might also have a sticking thermostat. Alot of fords get air pockets, make sure if it needs coolant to let it run for about 10-15 min with the radiator cap off.

Oct 15, 2010 | 2003 Ford F150 Regular Cab

1 Answer

How do you refill a radiator on a 2001 chevy silverado 4.8l engine after changing hoses?

Pretty much the same way you would normally, Except you will want 1. engine to be cool/cold. 2 fill it to top. Let it sit and run with cap off. As it gets closer to normal operating temp you will see the water level suddenly drop off. top it off again, repeat 2 or so times to make sure all fluids are back to top level. also would and or could vary if you pulled the plug on the engine block as well. may take more fluids. Also follow what they say inthe manual for which fluids to use.

Nov 09, 2009 | 2001 Chevrolet Silverado 1500

1 Answer

2001 silverado has no heat and the switch is on hot setting

check the coolant make sure it's full check to make sure your engine temperature reaches normal operating temperature if not then a new thermostat may fix the issue. if the engine does reach operating temperature the check to make sure the blend door under the dash is working properly

Oct 19, 2009 | 2001 Chevrolet Silverado 1500

2 Answers


I would your sending unit I dont really think you have a problem with your engine,I hope this helps you

Sep 22, 2009 | 2001 Chevrolet Silverado 1500

Not finding what you are looking for?
Cars & Trucks Logo

193 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

70365 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22041 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6878 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides