Another misfire question.

 
Old 11-03-2016, 03:37 PM
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Default Another misfire question.

I have a 2007 q7 that has had a misfire problem for a while now. It runs and idles great but when the rpm gets up around 4500 the the check engine light starts to flash.
When I check the codes it says there is a missfire on cylinders 1, 4 ,2 ,8, 6, and 7. The funny thing is those cylinders missfire when I'm accelerating, but if im decelerating and down shift to slow down then cylinders 3 and 5 start to misfire. I took it to the dealer a while back they replaced the fuel pump, the fuel filter, the spark plugs and coils and an intake runner actuator to no avail. I asked them about cleaning the carbon off the intake valves but all they offer is a some sort of cleaner they spray in the intake while the engine is running so I ordered the parts and did it myself. Still have the same missfire. If anyone has any ideas that would be very helpful thanks.
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Old 01-11-2018, 01:23 PM
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