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Username Post: 2001 Silverado Hard Start when Hot        (Topic#107737)
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
07-25-05 03:40 AM - Post#747107    

I have a 2001 HD 2500 Full Box Ext. Cab. 6.0 L. 70K miles.

Over the last 6 months or so it has started acting up when warm. The truck always starts cold without any problems. When warm, just turning the key, the engine will crank with
no attempt to start. If I turn the key off completely then
retry starting, it starts immediately. Every time.

I've looked thru the threads here and tryed replacing the fuel pressure regulator. That helped a friends truck that has a similiar problem but not mine. No help.

Fuel pump sounds okay or at least does not sound any different than it always has. Seems to energize with each turn of the key (still gathering data on that).

This "seems" to be electrical and seems to be fuel related. Is there a sensor controlling the fuel pump relay? I have not experienced any power loss or any stalls under normal driving. I'm having a bit of trouble believing my fuel pump is weak or bad. I tow with this vehicle regularly and have never experience any power related problems. Fuel filter was changed about 15K miles ago.

Any ideas?


Thanks,

Kunk
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
nodakbassmaster 
Super Senior Member
Posts: 4397
nodakbassmaster
Loc: Poorhouse, SD
Reg: 03-14-04
Re: 2001 Silverado Hard Start when Hot
07-25-05 10:28 AM - Post#747108    
    In response to kunk

anyone? Is your security light on?
Richard

'09 Silverado 3500HD CC LB D/A LTZ Z71, Mods Annonymous Member #3


 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
07-25-05 10:33 AM - Post#747109    
    In response to nodakbassmaster

Quote:

anyone? Is your security light on?




Nope. Wish it was that.

Kunk.
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
nodakbassmaster 
Super Senior Member
Posts: 4397
nodakbassmaster
Loc: Poorhouse, SD
Reg: 03-14-04
Re: 2001 Silverado Hard Start when Hot
07-25-05 10:35 AM - Post#747110    
    In response to kunk

Have you scanned the computer for codes?
Richard

'09 Silverado 3500HD CC LB D/A LTZ Z71, Mods Annonymous Member #3


 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
07-25-05 10:44 AM - Post#747111    
    In response to nodakbassmaster

Quote:

Have you scanned the computer for codes?




No I have not. I have no messages on the board but that
is a good point. What scanner do I need? I'll check the
local Auto-parts store. Seems like one in town was advertising free use of a scanner or minimal charge for using one. At $85/hr. I don't mind trying a few things
prior to talking with GM.

Kunk.
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
nodakbassmaster 
Super Senior Member
Posts: 4397
nodakbassmaster
Loc: Poorhouse, SD
Reg: 03-14-04
Re: 2001 Silverado Hard Start when Hot
07-25-05 01:10 PM - Post#747112    
    In response to kunk

most automotive parts stores ei checkers, autozone, ect. will scan it for free.
Richard

'09 Silverado 3500HD CC LB D/A LTZ Z71, Mods Annonymous Member #3


 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
08-02-05 03:40 AM - Post#747113    
    In response to nodakbassmaster

Quote:

most automotive parts stores ei checkers, autozone, ect. will scan it for free.




Well, was able to get up to the top of the waiting list
at Checker auto locally here and scanned the truck this
morning. It reports no error or warnings. Tests all
completed normally.

I'm going to try spark plugs for the heck of it. I had
an hard start problem in winter driving years ago with
a cavalier. It turned out to be the AC plugs. The truck
is at 70K miles so it couldn't hurt to have new plugs
anyway I guess. From there I will see the GM boys if I
do not here any other ideas.

Thanks.

Kunk.
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
09-27-05 04:16 AM - Post#747114    
    In response to kunk


Found something interesting a few weeks ago. I noticed that
this problem does not occur after putting gas in the truck.
Truck starts the first time every time, after having the tank
open. I tried this in a couple of parking lots as well.

Not sure if there is a negative or positive pressure problem. I'm going to replace the cap and see if this
makes any difference.
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
01-25-06 04:54 AM - Post#747115    
    In response to kunk

Still troubleshooting this problem.

Have replaced the gas cap but not luck. Problem still dissapears whenever the cap is removed.

At my last oil change, they talked me into cleaning the plenum for the fuel rail. It was lined with about a 1/8 inch of carbon and they said it caused hard starts. So, they ran two cans of cleaner through the vacuum lines and it
seemed to run a bit better for a day or so.....then back to
the usual operation.

I guess I'll need to take it in soon. Sure would like to figure this out on my own.
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
Suburbazine 
"2nd Year" Silver Supporting Member
Posts: 495
Suburbazine
Loc: Baton Rouge, LA
Reg: 01-12-06
Re: 2001 Silverado Hard Start when Hot
01-25-06 05:08 AM - Post#747116    
    In response to kunk

Have you tried stepping on the gas while starting? And is your truck ETC or direct throttle control?
2002 Tahoe 5.7L Z56
Forged Pistons & Rods
EPS Dyno Tune
Comp 218/222 114+4LSA .600 lift cam w/ full valvetrain upgrade
Ported | Polished | Milled .030" 862 heads
4L80E conversion, Vigilante 4200 triple disc


 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
01-25-06 12:41 PM - Post#747117    
    In response to Suburbazine

Quote:

Have you tried stepping on the gas while starting? And is your truck ETC or direct throttle control?




I have a throttle cable. I have not tried this. What do you suspect from trying this, just curious. I currently drive my S10 pickup daily to save gas. I can try this next time I take it out.
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
01-25-06 12:59 PM - Post#747118    
    In response to kunk


Does anyone have the part number or repair manual pics of the oil pressure safety switch? Not sure I understand how the gas cap scenerio fits in but could the switch be turning holding off the fuel pump? If this system is like my older FI engines, there was a starting mode and then a running mode. Starting mode ignored the fuel pump safety switch...bypassing it. Once the vehicle was running the safety switch kept the pump energized. This problem does not appear to be that. Seems like it would start and stall if this was the problem. Just curious if it's easy to change out I might try it too.
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
Suburbazine 
"2nd Year" Silver Supporting Member
Posts: 495
Suburbazine
Loc: Baton Rouge, LA
Reg: 01-12-06
Re: 2001 Silverado Hard Start when Hot
01-25-06 02:32 PM - Post#747119    
    In response to kunk

The reason I'm asking is because I've seen carbs (I know this is an injection engine) on other engines develop air bubbles when hot. If opening the throttle doesn't help, the problem may be elsewhere.

Some people tend to disagree with my procedures on fixing things . When the most likely thing isn't the issue, I take a shotgun approach and go for a lot of things at once, then narrow down the focus until I have the culprit. I picked the throttle unit because I doubted it had been tested. If the pump is working but fuel doesn't make it to the engine, I know it's fuel related.

Oh, that reminded me. Look on the opposite side of your throttle body from the control cables; do you have an electrical connector there? Make sure it has a good connection. I am not sure what it's function is, but it may control something ignition related.

Other than this I don't know what could be the issue.
2002 Tahoe 5.7L Z56
Forged Pistons & Rods
EPS Dyno Tune
Comp 218/222 114+4LSA .600 lift cam w/ full valvetrain upgrade
Ported | Polished | Milled .030" 862 heads
4L80E conversion, Vigilante 4200 triple disc


 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
02-12-06 04:59 PM - Post#747120    
    In response to Suburbazine

Quote:

The reason I'm asking is because I've seen carbs (I know this is an injection engine) on other engines develop air bubbles when hot. If opening the throttle doesn't help, the problem may be elsewhere.



Some people tend to disagree with my procedures on fixing things . When the most likely thing isn't the issue, I take a shotgun approach and go for a lot of things at once, then narrow down the focus until I have the culprit. I picked the throttle unit because I doubted it had been tested. If the pump is working but fuel doesn't make it to the engine, I know it's fuel related.

Oh, that reminded me. Look on the opposite side of your throttle body from the control cables; do you have an electrical connector there? Make sure it has a good connection. I am not sure what it's function is, but it may control something ignition related.

Other than this I don't know what could be the issue.





I can step on the pedal when this problem occurs and it will
start. I've done this quite a few times. Most of the time the engine will act like it is flooding as it stumbles for a few seconds before running well.

I then pulled the connector for the throttle position sensor
opposite side of the plenum from the throttle cable. It appeared clean. I touched it up a bit and clipped it back
on. Since then (about a week), it has been starting more than not. When it does not, I can lightly touch the pedal
and it will start.

Today I took a couple hour trip. I stopped to get gas and
just like clockwork, after putting gas in the tank, it starts perfectly. This scenerio gives me the cleanest start mode. Your pedal idea also works but seems to confuse the fuel delevery to the motor.

I may shotgun the throttle position sensor but I'm not confident in this solution yet. I've been really busy and
have not been driving the truck a lot lately. I'll keep you
posted on any other things I can think of.

Thanks
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
Ryan 
Senior Member
Posts: 432

Reg: 07-16-03
Re: 2001 Silverado Hard Start when Hot
02-12-06 05:19 PM - Post#747121    
    In response to kunk

I had the hard start when warm issue on my work truck (2001 Sierra) it ended up being the Fuel Pressure Regulator. Same thing is starting to happen on my 99 Silverado

 
Ryan 
Senior Member
Posts: 432

Reg: 07-16-03
Re: 2001 Silverado Hard Start when Hot
02-12-06 05:22 PM - Post#747122    
    In response to Ryan

I would replace the fuel filter again as well.

 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
02-14-06 03:55 PM - Post#747123    
    In response to Ryan

Quote:

I had the hard start when warm issue on my work truck (2001 Sierra) it ended up being the Fuel Pressure Regulator. Same thing is starting to happen on my 99 Silverado




I thought that was it as well. It was the first thing replaced a while ago. No help. Bummer.
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
02-14-06 03:58 PM - Post#747124    
    In response to Ryan

Quote:

I would replace the fuel filter again as well.




Thinking the same here. I did that two weeks ago. No help.
Thanks

Dan.
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
Ryan 
Senior Member
Posts: 432

Reg: 07-16-03
Re: 2001 Silverado Hard Start when Hot
02-14-06 05:20 PM - Post#747125    
    In response to kunk

<sigh> well if it is the fuel pump, I guess when you fill up it could do something to the fuel pump since it is in the tank...

 
silvervortek 
Senior Member
Posts: 732

Loc: Georgia USA/ west coast I...
Reg: 10-10-04
Re: 2001 Silverado Hard Start when Hot
02-14-06 07:06 PM - Post#747126    
    In response to kunk

I had the same issue of hard starts first time when engine was hot/ changing the fuel pressure regulator fixed it for me.
I wonder if someone got a fuel pressure regulator, fitted it on their truck cleaned up the old one and put it back in the box and returned it.or simply the one you got may be faulty. Try starting and stopping your engine a few times and check the vacuum line for signs of gas. It may not be the problem but you have nothing to loose by checking.
Im baught air filters a few times that were completely blocked with dirt that had been swapped out for a new filter and the old filter put back in the new box and put back on the shelf. it even happened with an oil filter i bought once/ i open boxes now before i buy at auto parts stores lol
I have a 99 silverado, regular cab ,long bed ,was 4 wheel drive,has auto and 5.3 vortek engine. one hundred and thirty


 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
02-15-06 05:05 AM - Post#747127    
    In response to silvervortek

Quote:

I had the same issue of hard starts first time when engine was hot/ changing the fuel pressure regulator fixed it for me.
I wonder if someone got a fuel pressure regulator, fitted it on their truck cleaned up the old one and put it back in the box and returned it.or simply the one you got may be faulty. Try starting and stopping your engine a few times and check the vacuum line for signs of gas. It may not be the problem but you have nothing to loose by checking.
Im baught air filters a few times that were completely blocked with dirt that had been swapped out for a new filter and the old filter put back in the new box and put back on the shelf. it even happened with an oil filter i bought once/ i open boxes now before i buy at auto parts stores lol





I've checked the vacuum lines a couple of times from tips found here. Last time was last week. Are there any off the
shelf fuel pressure test meters out there? Perhaps something in the fuel delivery is under pressured? I'm getting close to taking this in. Probably should have already. Just stubborn I guess. I'm also an Electrical Eng. and I just cannot stand the GM shotgun everything electrical and hope we fix it approach. If I designed things like GM I would be fired. There should be numerous
testpoints on these systems where you could take simple measurments to derive a host of troubleshooting data.
Really frustrating.

Kunk.
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
05-26-06 04:50 AM - Post#747128    
    In response to Ryan

Quote:

<sigh> well if it is the fuel pump, I guess when you fill up it could do something to the fuel pump since it is in the tank...




Just wanted to close out this thread. I was pulling my 5th wheel last weekend and noticed that the truck was now missing and sputtering a bit on hills. Not bad but just enough that I could feel it in the gas pedal.

Anyway, I had enough and took it to GM. They tested the fuel pump and it was just under normal pressure ~50psi when running and also did not hold pressure when turned off. So, after $800 bucks it seems to be fixed. I guess I should have taken it in sooner. Hopefully this cures the problem for good.

Kunk
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
Ryan 
Senior Member
Posts: 432

Reg: 07-16-03
Re: 2001 Silverado Hard Start when Hot
05-26-06 02:57 PM - Post#747129    
    In response to kunk

I too had my fuel pump replaced recently right around the same price as you paid, so far things are good!

 
BowtieBonanza 
Senior Member
Posts: 174
BowtieBonanza
Loc: Las Vegas, NV
Reg: 07-14-04
Re: 2001 Silverado Hard Start when Hot
05-30-06 07:26 PM - Post#747130    
    In response to kunk

My truck does the same thing. Glad to hear there IS a solution! Just out of curiousity, did you have problems with your fuel gauge before replacing the fuel pump? Was it fixed after replacement, or is that attached to something else?
--Jonathan

'07 Silverado 1500 5.3 2WD Ext Cab Reg Bed

-RIP 3/17/2007-
'00 Silverado 1500 5.3 2WD
Flowmaster 3" Single Exhaust
K&N Intake
Wester's 89/93 Dual Tune


 
Ryan 
Senior Member
Posts: 432

Reg: 07-16-03
Re: 2001 Silverado Hard Start when Hot
05-31-06 02:17 PM - Post#747131    
    In response to BowtieBonanza

The Fuel level sensor is attached to the fuel sending unit, so they replaced it all. My fuel guage stopped working correctly shortly after I got the truck almost 3 years ago at around 70,000 miles. some report the fuel guage problems earlier, some later. It will happen eventually.

 
kunk 
Senior Member
Posts: 167

Loc: Chippewa Falls, WI, USA
Reg: 01-07-01
Re: 2001 Silverado Hard Start when Hot
06-05-06 09:06 AM - Post#747132    
    In response to BowtieBonanza

Quote:

My truck does the same thing. Glad to hear there IS a solution! Just out of curiousity, did you have problems with your fuel gauge before replacing the fuel pump? Was it fixed after replacement, or is that attached to something else?





My fuel guage sender has never given me a problem but I suppose it will now fail and I'll have to pay to drop the tank again. Truck is still running well with the new fuel pump.
1957 Belair 2door Hardtop
1947 Fleetmaster Coupe Street Rod
1938 Master Deluxe Coupe Street Rod


 
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