I recently changed 'spider' and fuel filter. Cranks fine, then when you pull off, the engine shuts down. Can keep it going in neutral most times, if you floor it, it will rev to 2500 or so with no issues, then reaches a point where it just backs down to 0 and cuts off. Can sometimes resuscite by patting accelerator. It almost always happens on startup. You know in 15 seconds if you are gonna need to turn around. Will sometimes self correct after sitting awhile, but you never know if its gonna run on the next trip. Mechanic says fuel pressure good, but it won't ever cut off when he has it. Fuel pump loud, can hear it running. Problem seems to happen more with 1/4 tank or less. Trash in tank? Fuel pump? Relays?
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Re: 1994 s-10 Vortec. Shuts down. Periodic.
I had a similar problem with My 94 S10. Are you geting black smoke and does the smoke smell really rich like gas?
If this is the case you may need to open up your plennum again where your spider injectors are and take a look at the fuel lines themselves. They are pre-formed by the factory and come into the plennum near the back left right side of your motor. Leave the battery connected and have someone go into your truck and turnthye key to the "ON" position, you know where the fuel pump primes the lines, and check to see if those lines are spraying into your motor. Mine had hairline cracks in them but because they are under like 75psi they shot gas like crazy into the motor making the truck run SUPER rich and it was hard to keep it started.
This could be why your mechanic says that you have good fuel line pressure, cracks in your lines may be too small to make a huge difference in the pressure reading, but all that extra fuel being dumped in your motor will really give your ECU a hard time.
The bad thing is since these are a factory part, you may have to shell out some $$$. I think I paid like $85??? for mine, but that was back in 2003.
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Do you have tbi or the spider fuel system. That spider fuel system is noted for problems. Did you use a gage and check fuel pressure? For tbi it is 9--13 psi. For the spider fuel system, it is higher.
How many miles on your engine? In park or neutral, not much load on the engine. There is a load when you put it in gear. Can you do cylinder compression test to see if compression is ok? I believe the highest reading to the lowest, all should be within 75% of each other. A generic spec. Maybe a 100 psi min. spec
No, the fuel regulator from a 96 will not fit a 98. The 98 is a vortec and i believe the 96 is TBI. You are on the right track though, but the fuel regulator is attached to the fuel injector spider and is one unit inside the upper intake. It is relative easy to replace just takes some time.
Your fuel filter may be at it's life time and will need to be replaced. Start with the simple and replace that, the other thing also that would cause the engine to shut down would be a faulty oil pressure sending unit. What is the oil pressure on the dash when the engine shuts down. You need at least 8 PSI to have the engine stay running. Check your Fuel pressure at the shredder valve and you should be 62-65 PSI with the engine not running and fuel system energized, once the engine is running it should drop about 5PSI. The last thing that could cause this would be a bad ICM, once the ignition system heats up the ICM fails and the engine shuts down. A mentioned, start with the simple and replace the fuel filter and check your fuel pressure to ensure your fuel Sending unit has not gone bad and will need to be replaced. Good luck and keep me posted.
Possibly faulty ignition module is the problem, stalls when engine is hot when you sit for a while it cools off and runs again until it heats up again, those are usually the symptoms of a bad ignition module and after a while it may give out all together and not run at all, usually if the module is at fault it shuts down the fuel pump so the engine don't load up with fuel, do to when engine continuously cranks over the injectors never stop squirting fuel and flood the engine do to lack of spark which is produced by the module, this could possibly be your problem.
Sounds like the fuel pump is the most likely suspect. The fule filter could also play a role in preventing the fuel under pressure from reaching the engine going uphill. If you haven't changed the fuel filter recently, change it either way, then you can rule it out if the problem persists.
OK first pushing the "gas" all the way down does nothing except when theTPS throttle psoition sensor is all the way open it shuts off the fuel injectors and this is called CLEAR FLOOD. When the truck does start is there a lot of thick black smoke?
The most common proble with the Vortec engineis the "spider" assembly under the plastic intake plenem. the fuel is delivered to the injector assembly the injectors are actually "poppets" on the end of plastic tubing that are fed through a fuel distributor assembly the fuel tubes often fail and get brittle and leak causing a righ condition which is why you need to hold the gas down to the floor. you are going to need to change the "spider " assembly and the fuel pressure regulator at the same time. this is your problem its so so common to the vortec engine. Now GM is the only place you should be trying to get these parts aftermarket will not work as well an could cause a fire. Gm will come with all the necessary parts to install it ONCE, and go ahead and buy intake plenem gaskets at the Gm Supply to while you are there Last I knew the "spider" and fuel presssure regulator were about $550.00 here in Seattle plus Labor to install
Hope this helps if you like this information please give me a fixya Rating I have personally changed about 100 spiders in the 14 years I owned my diagnostic repair facility here in Seattle