Valves could be causing the mis-fire. This is a well known cause on the 4.6 liters
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_677dced97ad9bddf
Thanks but took the car to a mechanic and had it checked by a electrical specialist and find out both of o2 sensors bank 1/1& bank2/1 going bad so tomorrow I'll let you know for the results...
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SOURCE: High rpm (fast idle)
it is normal. car is designed to do this when engine is cold. it called open loop. when it warms up it is called closed loop.
SOURCE: 2000 Grand Am Gt 3.4 V6 keeps overheating,
make sure cooling fan is working , check themastat , water pump .
SOURCE: misfiring
See what cylinder is loosing (if that's it) spark. Use a spark tester if you can, or remove plugs and turn it over with the wires on all of the plugs, grounded!
SOURCE: 95 impala lt1 will stall when warm and not start
On the plus side, when you are finished, you will have a new control system! On the negative side, you just spent more money on parts than if you'd have just taken it to a dealer! I hope you tested those components and determined they have failed. Any codes?
Seems like the only thing you missed is the coil and the temp sending unit (just for laughs, unplug it and see if it stalls out at the same time), or possibly a security system malfunction. Get a decent volt/ohmeter and a vehicle specific manual such as chiltons or haynes. Do some testing, hot and cold and compare your results.You need to determine what is shutting down (fuel, spark or both) Once you develop a "picture" regarding what is happening, you will be more able to find a solution. I can't give you a "fix" on this one only because to properly identify the problem, I'd need to do the same testing I suggested.
good luck
SOURCE: i have 05 kia rio and its idling ruff and code is
How many miles, and have you had the fuel filter changed at all?
It could also be an O2 sensor. Try removing them. Tip should be a gray/tan color. If its green you have a blown head gasket.
Testimonial: "thanx 4 the help i change the fuel filter and car runs much better now but code remain the same but idleling is80% better now.God bless u. "
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