99 vortec 350- wont start- lost - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tommystwins · 05-30-2010, 03:15 PM

60#s fuel pressure on the rail at the test port.
replaced pressure control regulator,plugs,wires,rotor,cap.
Started out hard to start after the engine cooled, but would start and run great as long as the engine was hot. Never a miss or stall. Now it wont start @ all. I am getting fire. pulled #1 plug to see. Has to be fuel.......am I missing something?

68GMCCustom · 05-30-2010, 03:28 PM

sure you have spark at the plugs?

Tommystwins · 05-30-2010, 03:50 PM

Quote:

Originally Posted by 68GMCCustom

sure you have spark at the plugs?

I am getting fire. pulled #1 plug to see.

I thought it might be the coil or module, but ruled that out. Plenty of fire to the plugs.

**bwood** · 05-31-2010, 12:13 AM

Fuel pressure is good, but do the plugs smell like the injectors are firing? I can only think of two things that will keep the injectors from firing on this engine, Crankshaft sensor (Computer doesn't see the crank spinning) or bad ignition module. I just went through this with a friend over the phone and then at his house. Same issue, crank with no start. Fuel pressure was good, he was seeing fire at the plugs and cap/rotor/wires good. I had him pull a plug and check for gas smell and nothing. I told him the same thing, crank sensor or ign module. I recommended taking the module off and having it tested, instead he just bought a new one from Azone (strike one) installed it and still nothing. He then went and bought a crank sensor from Azone (stirke two). He then went back to them for some "Expert advice" and ended up with a cap and rotor (stirke THREE). I went out there and took a spare module I had and guess what, it started right up. We took all the new stuff back as they told him they would take it back if it didn't work ???? but they did and we went to Oreilly and got a AC Delco module and he went ahead and got AC plugs, wires, cap and rotor and a Wix fuel filter just for good measure, the other stuff only had 234k on them.

Tommystwins · 05-31-2010, 09:48 AM

Thanks bwood.

The plugs are not getting any fuel at all. I "thought" the ignition module regulated spark.

I was wondering what part regulated when the injectors were supposed to "fire" it has to be an electrical component since they have wires going to them.

When I can isolate this part I "think" i will be better off.

68GMCCustom · 05-31-2010, 01:43 PM

is this a CPI type injecton system? Or TBI?

Tommystwins · 05-31-2010, 01:49 PM

Quote:

Originally Posted by 68gmccustom

is this a cpi type injecton system? Or tbi?

csfi....

68GMCCustom · 05-31-2010, 01:53 PM

you sure that its good? a buddy has a similar CPI setup and the "spider" is known to be a problem part. CSFI looks like it is engineered similarly.

Tommystwins · 05-31-2010, 04:11 PM

Replaced iginition control module.....still no fuel on plugs......

clinebarger · 05-31-2010, 09:24 PM

60 psi is low for cranking. Even though bwood is correct the spec is 60-66 psi but cranking can require at least 63 psi on high milage poppet nozzles. Try spraying a little carb cleaner in the intake if it starts & runs good try clamping off the return line (pinch the rubber return line under the truck, its the 5/16" line not the 3/8"). Fuel pressure should max out at 80-100psi. If it does not the fuel pump is weak.

Black 95 TSI · 05-31-2010, 09:43 PM

FUEL PUMP. THe CPI have a valve and you need like 66+ psi for the valve to open and let fuel pass. Dont forget to put a new filter on it too!

clinebarger · 05-31-2010, 10:25 PM

Quote:

Originally Posted by Black 95 TSI

FUEL PUMP. THe CPI have a valve and you need like 66+ psi for the valve to open and let fuel pass. Dont forget to put a new filter on it too!

I thought I already covered this, But in a less crude way?

Tommystwins · 05-31-2010, 10:48 PM

Thanks.

Looks like I will be changing the fuel pump next. I had rather be working under the hood or rebuilding a tranny.
LOL
but gotta do what you gotta do.

onebad65c10 · 06-12-2010, 08:50 AM

I had the same problem with my 99 Yukon. CPFi vortec 350. I would get intermitent start/ stall problems. Replace the fuel pump, fuel regulator, spider, full tune up, ignition module, coil. Come to find out after being stuck 300 miles from home and it taking an hour to get the truck started. I took it to the dealer and they had to replace my Passlock2 sensor and module. Never har a problem with the truck not starting again.
You may want to check youd distributor also. They just told me mine was worn out and the shaft. Just my$0.02

05-30-2010, 03:28 PM	#2
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: 99 vortec 350- wont start- lost sure you have spark at the plugs? __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

05-31-2010, 12:13 AM	#4
bwood Registered User Join Date: Jan 2003 Location: Denison, Texas Posts: 1,919	Re: 99 vortec 350- wont start- lost Fuel pressure is good, but do the plugs smell like the injectors are firing? I can only think of two things that will keep the injectors from firing on this engine, Crankshaft sensor (Computer doesn't see the crank spinning) or bad ignition module. I just went through this with a friend over the phone and then at his house. Same issue, crank with no start. Fuel pressure was good, he was seeing fire at the plugs and cap/rotor/wires good. I had him pull a plug and check for gas smell and nothing. I told him the same thing, crank sensor or ign module. I recommended taking the module off and having it tested, instead he just bought a new one from Azone (strike one) installed it and still nothing. He then went and bought a crank sensor from Azone (stirke two). He then went back to them for some "Expert advice" and ended up with a cap and rotor (stirke THREE). I went out there and took a spare module I had and guess what, it started right up. We took all the new stuff back as they told him they would take it back if it didn't work ???? but they did and we went to Oreilly and got a AC Delco module and he went ahead and got AC plugs, wires, cap and rotor and a Wix fuel filter just for good measure, the other stuff only had 234k on them. __________________ 1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec -Gibson Stainless Cat Back Swept Side -SS Wheels 2005 Honda CRF250R 2006 Honda CRF150F

05-31-2010, 09:48 AM	#5
Tommystwins Registered User Join Date: May 2010 Location: Homer, Louisiana Posts: 10	Re: 99 vortec 350- wont start- lost Thanks bwood. The plugs are not getting any fuel at all. I "thought" the ignition module regulated spark. I was wondering what part regulated when the injectors were supposed to "fire" it has to be an electrical component since they have wires going to them. When I can isolate this part I "think" i will be better off.

05-31-2010, 01:43 PM	#6
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: 99 vortec 350- wont start- lost is this a CPI type injecton system? Or TBI? __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

05-31-2010, 01:53 PM	#8
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: 99 vortec 350- wont start- lost you sure that its good? a buddy has a similar CPI setup and the "spider" is known to be a problem part. CSFI looks like it is engineered similarly. __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

05-30-2010, 03:15 PM	#1
Tommystwins Registered User Join Date: May 2010 Location: Homer, Louisiana Posts: 10	99 vortec 350- wont start- lost 60#s fuel pressure on the rail at the test port. replaced pressure control regulator,plugs,wires,rotor,cap. Started out hard to start after the engine cooled, but would start and run great as long as the engine was hot. Never a miss or stall. Now it wont start @ all. I am getting fire. pulled #1 plug to see. Has to be fuel.......am I missing something?

05-31-2010, 04:11 PM	#9
Tommystwins Registered User Join Date: May 2010 Location: Homer, Louisiana Posts: 10	Re: 99 vortec 350- wont start- lost Replaced iginition control module.....still no fuel on plugs......

05-31-2010, 09:24 PM	#10
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: 99 vortec 350- wont start- lost 60 psi is low for cranking. Even though bwood is correct the spec is 60-66 psi but cranking can require at least 63 psi on high milage poppet nozzles. Try spraying a little carb cleaner in the intake if it starts & runs good try clamping off the return line (pinch the rubber return line under the truck, its the 5/16" line not the 3/8"). Fuel pressure should max out at 80-100psi. If it does not the fuel pump is weak.

05-31-2010, 09:43 PM	#11
Black 95 TSI Registered User Join Date: Jan 2007 Location: Alexandria VA Posts: 77	Re: 99 vortec 350- wont start- lost FUEL PUMP. THe CPI have a valve and you need like 66+ psi for the valve to open and let fuel pass. Dont forget to put a new filter on it too! __________________ 70 C10 SWB stepside forsale 00 Silverado Z71 Sold 95 Eagle Talon TSI turbo (Hellz ya its fast) 70 Chevelle 69 firebird 10 Silverado 4x4

05-31-2010, 10:48 PM	#13
Tommystwins Registered User Join Date: May 2010 Location: Homer, Louisiana Posts: 10	Re: 99 vortec 350- wont start- lost Thanks. Looks like I will be changing the fuel pump next. I had rather be working under the hood or rebuilding a tranny. LOL but gotta do what you gotta do.

06-12-2010, 08:50 AM	#14
onebad65c10 Gm for life. Join Date: Jan 2009 Location: Baltimore, Md Posts: 119	Re: 99 vortec 350- wont start- lost I had the same problem with my 99 Yukon. CPFi vortec 350. I would get intermitent start/ stall problems. Replace the fuel pump, fuel regulator, spider, full tune up, ignition module, coil. Come to find out after being stuck 300 miles from home and it taking an hour to get the truck started. I took it to the dealer and they had to replace my Passlock2 sensor and module. Never har a problem with the truck not starting again. You may want to check youd distributor also. They just told me mine was worn out and the shaft. Just my$0.02 __________________ Phil CHEVY ONLY Baltimore, MD 65 Short wide: 383 stroker 5 spd Toys: D/D: 2017 Silverado LTZ2 crewcab 1969 Pontiac GTO Yes it is a real goat waiting its turn to be the car it was. http://www.facebook.com/home.php#/pr...59&ref=profile



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