RX - 1st Gen (1999-2003) Discussion topics related to the 1999 -2003 RX300 models

1999 RX300 What could cause a random misfire in Cylinder 3 and 5 only? P0303 P0305

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Old 01-17-12, 08:32 AM
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bwilmoth
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Default 1999 RX300 What could cause a random misfire in Cylinder 3 and 5 only? P0303 P0305

My machanic says the plugs, coil, and injectors are all good. Anyone have any ideas?
I thinking the OCV's could cause this but have no code to confirm they are bad. Is this unusual?
The OCV's were replace two years and 30,000 miles ago almost to the date.
Knock sensor was replaced 8 months ago.

Any help would be appreciated

Brian
Old 01-17-12, 08:56 AM
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amblyn
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Originally Posted by bwilmoth
My machanic says the plugs, coil, and injectors are all good. Anyone have any ideas?
I thinking the OCV's could cause this but have no code to confirm they are bad. Is this unusual?
The OCV's were replace two years and 30,000 miles ago almost to the date.
Knock sensor was replaced 8 months ago.

Any help would be appreciated

Brian
Welll could be way of but from expierience only time i had misfire was in 3 and 5 was caused by bad airfuel sensor b1s1 but i had other codes then just misfires. good luck
Old 01-17-12, 09:20 AM
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bwilmoth
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Thanks Amblyn.
Old 01-17-12, 10:29 AM
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thomas1
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I would start with swapping the coils and see if the codes change...Your mechanic may not be correct.
Old 01-17-12, 11:34 AM
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artbuc
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Originally Posted by thomas1
I would start with swapping the coils and see if the codes change...Your mechanic may not be correct.
+1. That's why I asked OP how his mechanic determined coils were ok in his other thread.
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