Okay, SO. I replaced all plugs and coils, solving my misfires. Got a transmission flush to attempt to solve my incorrect gear 4 ratio, sadly that did not work. However, after refueling my car hates to start and I’ve found out this is most likely due to a bad purge valve (also the reason behind my car throwing an evap code). Could this also be the reason my gear 4 ratio is throwing a code? Could the purge valve solve this as well?
thank you! Any idea what the problem might be? My next step is to start with a shift solenoid kit or variable timing solenoid replacement. Or should I pay the $120 and have AAMCO diagnose it? Thoughts and opinions much appreciated!
FWIW while this won't help you with your transmission issue, like many I also experienced this problem of my Kia Rio being hard to start and then stalling after a fill-up. After researching it and eliminating various other potential causes, I decided that it was probably a bad purge valve. So I ordered an OEM replacement on Amazon for $21, and installed it (which was a bit of a pain since I don't have clamp pliers and it's in a semi-tight area), and the problem went away. My gas mileage also appears to have improved, although it's too soon to tell for sure. I need to put 100-200 miles on the car and then find out. As for your gear 4 ratio issue, could it be a bad/slipping 4th gear?
I have also ordered the purge valve and it is arriving and will be replaced Saturday. I've decided there's too many possible outcomes as to what the gear 4 issue could be and am having it diagnosed at AAMCO this week. But the purge valve solving you startup after refuel is really good to hear and I'm hoping mine will result the same way!
Did you get the new valve installed and did it at least solve the stall after refill issue? My gas mileage also improved, but not quite as much as I'd hoped. I mostly do urban stop and go driving for relatively short distances, plus it's winter so more stress on the car, so maybe that's it. Also, 157k miles, so older engine, looser pistons, lower compression, etc.
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