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It may not be the gas cap at all, it may be the gas tank seal at the gas cap or a vacuum leak in the tank. Also could be a defective part.....it happens. Pressure tools check it out. Good luck, Frank M
if it drives good,why not just ignore it ,till spring
(usa answer) its 85F here.
its the gas tank venting system.
or
learn to use a real scan tool
then post the DTC errors or savvy persons can wax smarter
in bad weather evap systems are in fact noted for there malfuctionig or flat out lies.
try to imagine when the fuel tank,goes from hot to cold
the gas cap ,vacuumbreaker opens and sucks in fresh moisture laden air, and then that vapor, freezes.
no power on earth can stop that. (key off)
wait till spring and stop worry.
or post errors.
we can work single word fails ever,"evap"
no starts
open gas cap
whisssssssss
put back cap
and start car
run now.?
if not scan it while cranking, omg dTC errors. try not to guess
read the errors, lots can fail cold.
does engine start using spray test fuel method?
if yes, its fueling issue
cap is first. on tank filler, those too can freeze and fail, all by thereselves..(vacuum breaker faILURE)
The problem could be a clogged air vent in the gas cap, causing a vacuum in the gas tank . The next time this happens, loosen the gas cap and see if the problem goes away. If so, replace the gas cap.
Your code, assuming it was evap related, also means other issues aside from a loose gas cap. Your fuel system "closes" down to purge unburned fuel back through the engine. A loose gas cap will stop this process, as in why the check engine light will go on. Also, there is a vent solenoid, purge solenoid, fuel tank pressure sensor, and a charcoal canister that are involved. My guess, but if you have a bad vent solenoid, you may have symptoms like yours. Any "good" technician can test this for you.
try starting with starting fluid if starts check fuel pump just incase
these steps are done by the flowoling remove airfilter spay starting fluid in start jeep keep in mind if this dose not work 1st time it may take up to 6 times if it starts than shuts off hve someone help u by turning the key to the on position see if u get a humm by the gas cap you may want to open gas cap to assit in hearing the pump
fuel tank cap has to be on for the evap system to operate,engine should always be off while fueling.with cap off it should throw a code for evap system leak.
PO455 is a large evaporative fuel leak. A bad fuel cap is ONE of the things that COULD be the problem. Fuel system cleaning only lightened your wallet. Reading your post is confusing. Did all this start AFTER the Valvoline Wallet Flushing? If so , they left something loose or disconnected. I would find a qualified repair shop to fix the problem, and if it has anything to do with what Valvoline did, make them pay the bill.
the gas cap and check engine light thing are related in terms of the EVAP system, or the evaporative emisions system. This is NOT where your surge, or "chug" is coming from. The surge could be coming from a Exhaust Gas Recurculation valve that is starting to bind or "hang up" a bit. DO you notice this happens more at lights, or when coming to a stop? if so it could be an idle air control vavle.
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