2001 Kia Rio.68K miles Car always starts and idles fine to begin with. At various times car loses power and when you stop ar red light it idles real rough and when you take off it won't go over 50-55 mph. When you stop and shut car off for a while,it may run well for several days. Then all of a sudden you wonder will it make it home. I have had kia check it. They replaced Timing belt, fuel filter, plugs, wires, and even cleaned fuel system by flushing it. The problem still exists. Don"t ever know when it will act up. Sometimes it runs good you would never think there was a problem. Could it be electrical , mechanical. I don,t know.
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Re: at times car can not run over 53mph.
U need a special test gauge, it hooks to a test port on the supply pipe to the engine fuel injectors's, looks like a metal tire valve, u may be able to borrow this fuel pressure test guage from Kragen or Autozone, call them and check.
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Smoke is never a good thing and it can be coming from an electrical connection that is not solid any more.
I would 'grope' the wiring under the dashboard to see if you find anything exhibiting heat.
If your primary fuse box is inside the car, open and inspect it to make sure there are no scorched or obviously melted fuse or fuse holders.
The rough running under the described conditions kind of points to a problem with moisture.
On a dry evening, park in a dark area, pop the hood and with the engine at an idle, look for sparks where none should be.
The common factory ignition wiring can start to leak after years of heat and cold.
The insulation value of it sinks and it may even develop visible cracks.
When it is moist, this can easily cause misfires.
Had a problem with my daughters Kia Rio, it would tend to loose power and would not accelerate easily, tried everything and it turned out to be the feed cables for the fuel injection which run at the rear of the engine along the baulkhead, which were streched ..Had to rewire .
Hello Kia Owner,
Regarding the shut down, when was the last time you changed the timing belt?? Did you know that the twin cam 1.5 lirte motor needs a new belt every 50,000 miles or 80,000 kms.
If the belt has failed it may still be in tact but with the cogs ripped off.
Your valves have collided with at least one piston but it is good you were only idling at the time.
The motor may be worth fixing. I just fixed mine myself. I had to lift the engine after removing the axles. I removed the old timing belt and removed and rebuilt the cylinder head(big job). Two exhaust valves were boken right off and lying inside one cylinder.
Most likely your timing belt failed as well.