The engine starts up and revs to about 3k rpm for about 5 seconds, then drops down to 500 rpm and chugs like its starved for fuel.
When I give it gas, it will rev up smoothly, but then it looses it and the rpm drops down again. If I hold the gas down, it will just rev up and down in 5 second intervals.
Its below freezing outside... it doesn't seem like an electrical problem would cause this behavior. Could it be water in the fuel?
When I had this same problem...it was the Catalytic Converter...cost about 200 to get it fixed at the Hyundai Dearlership :)
Sounds like the throtle position sensor is miss alined or the idle screw is backed off
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I checked the codes... po455, po452, po442, po449.
I believe all of these have to do with my charcoal canister problem.
Thank you.
Update: After putting fuel injector cleaner in it and driving it a few miles, the problem cleared up for 3-MONTHS. Now it is doing the same thing again.
Until it is warmed up, it stumbles and misfires.
Codes: Previous codes were due to a charcoal canister that I have since replaced. The current codes are: -p0301-p0303-p0304 misfire on cylinders 1-3-4
-P0171 running lean
-p1166 ???
It has specific symptoms:
-With steady presure on the gas pedel the engine revs up and down... though this seems to have gotten better since we added fuel additive.
-It idles at barely less than 500rpm and shakes. You can hear a misfire. Then when you push on the gas, it chugs then stalls. When done correctly, you can pump the gas pedal to get the engine to go above 1500rpm at that point, it seems to run OK... though you can still hear a random misfire.
Sometimes while idling you push on the gas pedal and the RPMs wont fall back down.
It still drives around. Once it is warmed up, you can get it to go from a stop by slowly pushing on the gas pedel as it chugs up to a higher rpm.
Thanks for your help : )
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