99-06 Silverado won’t stay on
Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
99-06 Silverado won’t stay on I have a 2000 silverado that won’t stay on, it’ll sometimes turn on and then a couple seconds later it’ll stall out and die, i had replaced the fuel pump around NOV of last year, thought the fuel filter might be clogged, so i replaced it, but it still won’t stay on, thinking it could also be a bad Crankshaft position sensor, or the tune since this all started after i revved it after i got a quick tune, and won’t stay on since then, anybody know what could be the issue? beginning to lose my patience
TECH Senior Member
Joined: Jun 2016
Posts: 22,295
Likes: 3,617
From: Central Cal.
Check ALL grounds and other connections, especially those on the back of the heads. They loosen/corrode and will cause a few nightmares
Last edited by G Atsma; Mar 2, 2023 at 05:24 PM.
Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
TECH Apprentice
Joined: Aug 2018
Posts: 383
Likes: 108
You need to hook up a scanner that has live data and see what the ECU is seeing from sensors. Check for codes too.
Check fuel pressure as well. Most likely electrical, sensor or fuel. You really don't want to start guessing and throwing parts at it because that introduces additional unknowns (new sensors may be bad, aftermarket quality, etc.) Then you have a bigger challenge on your hands.
Sometimes you can get lucky though. I'm assuming you have a V8?
Edit: tune? Yeah, check that also.
Check fuel pressure as well. Most likely electrical, sensor or fuel. You really don't want to start guessing and throwing parts at it because that introduces additional unknowns (new sensors may be bad, aftermarket quality, etc.) Then you have a bigger challenge on your hands.
Sometimes you can get lucky though. I'm assuming you have a V8?
Edit: tune? Yeah, check that also.
Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
You need to hook up a scanner that has live data and see what the ECU is seeing from sensors. Check for codes too.
Check fuel pressure as well. Most likely electrical, sensor or fuel. You really don't want to start guessing and throwing parts at it because that introduces additional unknowns (new sensors may be bad, aftermarket quality, etc.) Then you have a bigger challenge on your hands.
Sometimes you can get lucky though. I'm assuming you have a V8?
Check fuel pressure as well. Most likely electrical, sensor or fuel. You really don't want to start guessing and throwing parts at it because that introduces additional unknowns (new sensors may be bad, aftermarket quality, etc.) Then you have a bigger challenge on your hands.
Sometimes you can get lucky though. I'm assuming you have a V8?
Trending Topics
Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
The tuner brought me the ECU and claimed that it should run and drive, that way I could drive it up to his shop so we can do a street tune, im running a stage 3 cam, and he tuned it to a stage 2, but was told that it shouldn’t be a big issue by a couple other people, and truck did start and idle for a while and then had a buddy rev it, which afterwards it just choked and shut off. But have asked around other local tuner and they said that the tune shouldn’t be the issue which is why I’m thinking maybe it’s either a sensor or my fuel pressure
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
I have a 2000 silverado that won’t stay on, it’ll sometimes turn on and then a couple seconds later it’ll stall out and die, i had replaced the fuel pump around NOV of last year, thought the fuel filter might be clogged, so i replaced it, but it still won’t stay on, thinking it could also be a bad Crankshaft position sensor, or the tune since this all started after i revved it after i got a quick tune, and won’t stay on since then, anybody know what could be the issue? beginning to lose my patience
could a bad fuel regulator cause the truck to stall?
Last edited by 1Slowstepside; Mar 2, 2023 at 07:20 PM.
TECH Apprentice
Joined: Aug 2018
Posts: 383
Likes: 108
truck doesn’t turn on unless I turn ignition a couple times without starting the truck, which leads me to believe it’s fuel related, and the reason why it chokes and shuts off could be because it isn’t getting enough fuel to stay on, not entirely sure tho
could a bad fuel regulator cause the truck to stall?
could a bad fuel regulator cause the truck to stall?
Yes, a bad fuel regulator could cause most all pressure to be sent to the return line. If the pressure loss is great, it won't be enough to make injectors pulse properly. They need a minimum pressure. There's a spring and a diaphragm in the pressure regulator. I would not expect it to act up once the truck is running though.
I would strongly recommend you buy a fuel pressure gauge. I can't tell you how many times I have suspected a fuel delivery problem on my trucks from a crank-no-fire. Hook up my pressure gauge and pressure meets spec and holds. Can almost certainly, positively eliminate fuel and focus on other things. Hasn't failed me yet.
Fuel pressure gauge and test light are underrated in my opinion. MUCHO bang for your buck on either for basic diagnostics. 😊
Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
Could be coincidence on the tune. Could be the tune. Process of elimination, unless you can pop another ECU.
Yes, a bad fuel regulator could cause most all pressure to be sent to the return line. If the pressure loss is great, it won't be enough to make injectors pulse properly. They need a minimum pressure. There's a spring and a diaphragm in the pressure regulator. I would not expect it to act up once the truck is running though.
I would strongly recommend you buy a fuel pressure gauge. I can't tell you how many times I have suspected a fuel delivery problem on my trucks from a crank-no-fire. Hook up my pressure gauge and pressure meets spec and holds. Can almost certainly, positively eliminate fuel and focus on other things. Hasn't failed me yet.
Fuel pressure gauge and test light are underrated in my opinion. MUCHO bang for your buck on either for basic diagnostics. 😊
Yes, a bad fuel regulator could cause most all pressure to be sent to the return line. If the pressure loss is great, it won't be enough to make injectors pulse properly. They need a minimum pressure. There's a spring and a diaphragm in the pressure regulator. I would not expect it to act up once the truck is running though.
I would strongly recommend you buy a fuel pressure gauge. I can't tell you how many times I have suspected a fuel delivery problem on my trucks from a crank-no-fire. Hook up my pressure gauge and pressure meets spec and holds. Can almost certainly, positively eliminate fuel and focus on other things. Hasn't failed me yet.
Fuel pressure gauge and test light are underrated in my opinion. MUCHO bang for your buck on either for basic diagnostics. 😊
TECH Apprentice
Joined: Aug 2018
Posts: 383
Likes: 108
hey so I haven’t gotten a chance to run a scanner on the truck but I did test the pressure on the fuel rails, with key on, engine off it goes up to around 55 psi and then begins to drop fast, tried to turn it on and psi went back up to 55-60, and then dropped as truck began to choke and turn off, so now I’m leaning more towards the fuel regulator, but would like to hear your opinion
If you confirm injectors are not leaking, then most likely FPR is the problem.
Last edited by strutaeng; Mar 4, 2023 at 10:42 PM.
Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
Yes, very likely. It could also be an injector stuck open. This will cause a rich condition on bank affected by leaking injector. You don't have a rich code? You can pop the fuel rails and prime the truck and verify that the injectors are not leaking.
If you confirm injectors are not leaking, the most likely FPR is the problem.
If you confirm injectors are not leaking, the most likely FPR is the problem.