Question about 1997 Chevrolet S-10 Pickup
It started with the engine stumbling during cold wheather conditions (40 to 50 degF) and once the engine warms up the stumbling stops. Now, if I do not start the truck once a day, I will have to turn the engine over 8 to 12 times before I will start. I lift the hood and I can smell fuel. This is no fuel leak. There is some dieselling that occurs once I let the key out of the start position. This is a chevy 1500 2 wd with a vortex 350 engine.
The vortec engine is fuel injected whether you have MPI or SFI or even TBI depending on the year sounds like you may have a faulty coolant temperature sensor. It should be located toward the front of the intake near the themostat houseing. It sends a signal to the computer to richen fuel mixture and also control the idle air control valve to idle the engine up some. If these parts malfunction, you will have the stumbling problem.
The diesling comes from carbon deposits that build up on the valves. The carbon glows red hot while the engine is running and when you shut the engine off the red hot deposits act like glow plugs in a diesel engine and ignite unburned fuel in the combustion chamber which is why the engine is still running when you shut it off. A bottle of fuel injection cleaner once a month should start to fix this problem if not the heads will need to be pulled off and a valve job done.
Posted on Jan 06, 2009
Sounds like a fuel pressure regulator or possible fuel pump next time it wont start on the first try turn the key on and off a few times and then try it. Also locate the fuel pressure regulator and remove the vacuum hose have some one turn the key on if it leaks out fuel the regulator is bad becarefull when doing this the system is under high pressure and can possibly soary gas in youre face.Also check the tune up most of these engines have lots of problems with distributor caps and rotors
Posted on Jan 06, 2009
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Posted on Jan 02, 2017
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