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Re: Misfire issue
Here's the events in sequence:
1. random vibration of car (car was overdue for tune up)
2. wires and plugs replaced --> no effect on vibration
3. Mechanic assumes it is a failing engine
4. computer diagnostics output codes for: MAF, EGR valve, RANDOM misfire (usually it would say which cylinders if it was isolated)
5. MAF & EGR valve replaced --> no effect
6. computer diagnostics output codes: bad post cat converter O2 sensor, random misfire
A bunch of mechanics didn't want to speculate untill all the codes were "repaired" by replacing the failing electronic components. Now they're saying they don't know. The dealer took $100 to diagnose and didn't come out with anything as usual.
The misfires (which are hard misfires) tend to increase when the engine gets warmer. I should really start unplugging wires to see if it makes a difference but I doubt it.
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