need help plzzz misfiring low rpm gs300
08-15-16, 12:00 PM
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need help plzzz misfiring low rpm gs300
Hi guys,I have a gs300-2004 model, run 190,000 miles. I keep it well maintained recently couple a days ago the car started to give misfiring for unknown reasons. The popping is only in small rpms like from 800 to 1500 almost plus minus. This all if u gives a push if u go slowly on it nothing is there sometimes.So I thought maybe plugs r gone ….lets change them especially I didn’t do it long time almost 25000 miles. And check engine light was giving P0303- cylinder 3 misfire. So in brief what I changed periodically:
Moe
- Spark plugs new original Toyota parts.
- Full tested immaculate condition coils + wires JDM version.
- Previously 6 months back sockets for coils were changed.
- Fuel injector’s sockets are in good shape.
- Fuel injectors one year back were completely cleaned and filters changed.
- Air and fuel filter are in good condition.
- Air mass sensor in good condition.
- No air intake leaks.
- I have noticed that cylinder-3 connection wire insulations were cracked exactly after the socket for some over twisting or so, so I insulated the two wires from each other completely.
- This step gave me an improvement of %35 but still the misfiring is there.
- No more misfiring messages but the misfire is still there with less %35.
- Before the misfiring starts there was a sound started to generate like a buzzing sound or RF sound like the one you find car radios when three is no sound filters….and still till now…could it be related……but I feel it’s coming from the engine side but after 2500 rpm and it keeps in getter higher with the rpm.
- Could it be anywhere in the coils harness ……I mean anybody faced such a thing before.
- Performance is nice after 2000 rpm. But still I feel the car is clogged somewhere.
- Shall I open the coils harness and re insulate them again or not.
Moe
Last edited by moee; 08-15-16 at 12:08 PM. Reason: more details
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