vortech help

2wd_Sled_Puller

Heavy Equiment mechanic
Feb 19, 2008
1,356
0
0
Florida
kinda in a bind here i think i no the problem but tell me what yall think I got a 98 chevy sitting here and whats happening is the cylendar walls are fueling up with fuel. the motor locked down when it fills with fuel. I took all the plugs out of the truck and spun it over and it would spin over fine dumping fuel out of the cylender walls. i pulled the fuel pump relay and spun it over with the plugs out to kinda do a half ass job of getting the fuel out of the cylender wall. i put the fuel pump relay back in spun it over still with the plugs out then pocked the top of the rail to see if there was any rail pressure and there is none. So i beilve that the injectiors are sticking wide open and just filling the cyclender walls with fuel. this is a motor he bought to put in it. He had to put his old intake on so i beilve he may of wired the spider injection up wrong and when say cylendar 1 is firing maybe cylender 7 is spraying fuel. I never had one of these apart so i really dont no what kinda of headach im getting into can anyone give me a idea on things to look at??
 

duratothemax

<--- slippery roads
Aug 28, 2006
7,139
10
0
Wyoming
kurt how the hell do cylinder 'walls' get fuel in them. They are solid metal... You really need to be more clear/use proper terms/descriptions if you want to get straight advice.

98 should have been MPFI, not CPI.
 
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2wd_Sled_Puller

Heavy Equiment mechanic
Feb 19, 2008
1,356
0
0
Florida
kurt how the hell do cylinder 'walls' get fuel in them. They are solid metal... You really need to be more clear/use proper terms/descriptions if you want to get straight advice.

98 should have been MPFI, not CPI.[/QUOT1


1 Injector pure cylender if all 8 injectors are sticking open ( I dont see how it would by the way ) it will fill the cylender walls
 
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dmaxvaz

wannabe puller
Nov 22, 2006
1,132
0
0
46
METRO DETROIT
kurt how the hell do cylinder 'walls' get fuel in them. They are solid metal... You really need to be more clear/use proper terms/descriptions if you want to get straight advice.

98 should have been MPFI, not CPI.[/QUOT1


1 Injector pure cylender if all 8 injectors are sticking open ( I dont see how it would by the way ) it will fill the cylender walls
THE VORTECS HAVE INJECTORS WITH POPPET VALVES THAT OPEN AT 55-60 PSI.
 

68skylark455

Larry the "Stroker"
Aug 7, 2008
1,091
0
0
Texas
www.larrysperformancepalace.com
The fuel pressure reg is located under the plastic intake on pass side. They go out all the time, so much we usually keep two in stock. Its real simple to change. It will def lock down a motor. Check the return line for being pinched or kinked too. I work on a bunch of these sometimes daily during the summer for various issues. If you need anything call me 3253746912 and I will be glad to help if I can. Also, the fuel pump must hit atleast 55psi or the injectors won't open.

And yes, the 350 vortec stopped in 98 in the pickup but was still in some of the suvs till 2000 and the 3/4 and 1 ton pickups as well to 2000.
 

onebaddmaxxx

Active member
Feb 22, 2009
1,212
1
38
Cecil County Md
there is no way the injectors are wired wrong there is a big plug on top of the upper intake that can only go 1 way. there are 8 poppet injectors which are junk. iv had 3 of those vortec 350s and every single one of them i had to replace the injectors in. gmpartsdirect makes a newer style kit with "mini injectors" its a direct swap. thats what i did on all mine
 

THEFERMANATOR

LEGALLY INSANE
Feb 16, 2009
3,890
44
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ZEPHYRHILLS, FL
there is no way the injectors are wired wrong there is a big plug on top of the upper intake that can only go 1 way. there are 8 poppet injectors which are junk. iv had 3 of those vortec 350s and every single one of them i had to replace the injectors in. gmpartsdirect makes a newer style kit with "mini injectors" its a direct swap. thats what i did on all mine

Yep 96-98 in 1500's and up to 00 in 2500/3500's had the CPI wit hthe center mounted poppet injectors that are known to hang open and flood the engine out. GM made the updated spider injection assembly which converts it to true MPFI with 8 individula injectors at the ends of the hoses. The aftermarket also sells the conversion kit as the complete injector assembly now. I got one from CARQUEST awhile back and it was a GM piece in a CARQUEST box for less than GMPARTSDIRECT had it for.
 

lotsofmiles

Father of the Van
Dec 4, 2008
3,097
0
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Michigan
Kurt, let me know if you need anything. I got a 98 5.7 in a van I'm stripping.

its got a bad intake/head gasket.

with the engine off if I pour water in the radiator it goes straight into the oil.

I'm slowly taking apart the van and tossing parts on the shelf.

I can usually only handle one word instructions like go and stop and turn. So if you need anything be specific and pics help
 

THEFERMANATOR

LEGALLY INSANE
Feb 16, 2009
3,890
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ZEPHYRHILLS, FL
its got a bad intake/head gasket.

with the engine off if I pour water in the radiator it goes straight into the oil.

That's a bad intake gasket, VERY common issue with the crappy plastic intake gaskets. The newest intake gaskets are revised now with a metal ring in them to prevent them from being crushed as easily as these intakes are sensitive to being torqued down properly. Or if your intake or heads are pitted you can buy a paper gasket from FEL-PRO that will seal it up.
 

lotsofmiles

Father of the Van
Dec 4, 2008
3,097
0
0
Michigan
yea, I hear those intakes are junk.


Any tricks to make them last? My 99 5.7 van only has 90,000 on it, and I'd like it to go for a while.
 

THEFERMANATOR

LEGALLY INSANE
Feb 16, 2009
3,890
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ZEPHYRHILLS, FL
yea, I hear those intakes are junk.


Any tricks to make them last? My 99 5.7 van only has 90,000 on it, and I'd like it to go for a while.


Some of em break often, others not so much. I know that I put in a few sets back in 07 for people and they were still the old style all plastic black ones, but I recently got a set from VICTOR REINZ that were grey with the metal inserts in them. Gonna see how well they hold up. Otherwise you can go with the aftermarket FEL-PRO VORTEC set which are made of regular paper gasket material.
 

lotsofmiles

Father of the Van
Dec 4, 2008
3,097
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Michigan
Some of em break often, others not so much. I know that I put in a few sets back in 07 for people and they were still the old style all plastic black ones, but I recently got a set from VICTOR REINZ that were grey with the metal inserts in them. Gonna see how well they hold up. Otherwise you can go with the aftermarket FEL-PRO VORTEC set which are made of regular paper gasket material.

so its a hold your breath and hold the stocker holds:rofl:

oh well