When i crank my truck it runs wide open for a minute or so
and then it starts to idle down what causes this. it is a 1992
chevy S10 v6
I have a chevy Cavelier 84 and it starts ,and idles very fast and when i put it in gear it runs "normal" not as fast . But when the engine gets to about 190*) to 220*) the car stals after I put on the brake and then it wont start again until it cools down. I am a female and I am thinking it is somthing to do with the thermastat,or transmission problem?
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is commonly caused by a dirty automatic idle speed control valve and
throttle valve but always run a OBD2 fault code as well as the
cleaning procedure. Buy a can of throttle valve cleaner (do not use
carburetor spray cleaner!) from NAPA or Carquest (made by CRC
chemicals) and spray it into the air intake while the engine is
running, use up about 1/2 the can, engine will try to stall hold the
speed up, shut it down and let it soak for 30 minutes, restart and
blow out the remaining fluid, shut it down and disconnect the
negative battery cable for 5 Min's to reset the base idle control
It is the gasket underneath the throttle body. It is being sucked in at one corner causing a big air leak which caused the engine to idle at about 2500 rpms. You will probably have to buy a throttle body repair kit which will include a new gasket. This should fix the problem. You didn't mention engine size, but I think the 2.8 v6 is the engine that had this gasket problem.
could be many things. Could be choke causing problems, could be engine temperature sendor bad, could be EGR. When you mean engine light comes on do you mean service engine light coming on? Probably has codes set which means something is gone wrong and setting a code that tells the tech what is wrong or what to look for. Have you changed your fuel filter lately?
Before you start check the status of your choke. One that is stuck on will cause a high idle. If the choke checks out, proceed to the following:
You should have what's called a 2 needle carburetor. A larger screw adjustment for idle, and a smaller for high speed.
Start by adjusting your low speed (idle) needle until you reach the desired idle. I prefer about 850rpms. Do this with the engine running and adequately warmed so that your adjustments are not thrown off by the automatic choke.
Next slowly open up the high speed needle. As you open it your idle speed will gradually increase. Adust it in 1/8 turn increments, pausing after each adjustment to allow the changes to take affect. Keep opening it until you stop increasing your rpms, then take it back 1/8 of a turn.
Next readjust your idle mixture screw so that your idle is back down to 850rpms.
Most likely an air leak/vacuum hose problem. There could also be an issue with the throttle body base gasket. The 4.3 engines are known to rev a little high but a small air leak can make them rev really high when they should not.
When I crank my truck it runs wide open for a minute of so and then it starts to idle down. What causes this? It is a 1992 Chevy S10 v6 pickup. How can I fix this problem? I have no manuel on this vehicle for a diagram of the engine at all.