Sounds like your vent is plugged up or broken, so when you drive you create a vacuum and the fuel tank is being pulled in, thus the banging I just had a car with this issue, and I had to pull the tank out of the car and had to the show the customer before he would believe me, but seeing IS believing as they say. When you shut off the engine the vacuum decays and thus the tank reverses its process. Try driving your car with the fuel cap off and see if the noise goes away. That will prove it!
(also)- small leak in the tank
and finally try changing the gas cap itself
let me know
~Dave RockAuto Parts Catalog these folks are the best around for auto parts and believe me when i say you get your parts (if needed) before they say they will be there been there my friend.
if this does not work let me know and we will get this fixed i have had every problem with these luminas you can ever think of this is a fact lol and some are and can be nightmares but great vehicles no matter what anybody tells you i have owned them and worked on these for years now and this is 2014 so take it from there i have owned a 1999,98,97
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need. Goodluck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
ok on todays automobiles the gas cap does more than just seal the gas tank. Now they run a return line to the tank. this does 2 things. it returns un used fuel and vapors back to the tank , and it pressurizes the tank to help improve the fuel pump.
Now as it is possible running without the gas cap may cause problems I am not 100 % positive that is your only problem.
It sound like the knock sensor is detecting the knock you mentioned and is trying to retard the timing to fix it . In doing so it has retarded it to far causing the engine to loose power and eventually stall. I would first replace the gas cap. then run a good gas additive to a full tank of gas to clean out any water and dirt that may have gotten into the tank while the cap was off. now the issue of the knock as you described. is it a knock or a ping? A knocking sound is loud metallic hammering noise. a ping is a ting not very loud. if it is a loud metallic sound I would have a reputable mechanic check it soon, as it could be a serious issue. Ping can be caused by bad or weak gas or cheap low octane gas. I would run a mid grade gas in it and see if it fixed the issue.
A rhythmic metal on metal noise in an engine usually follows a classic rule: valves tap and pistons knock. If the noise is rhythmic with the speed of the engine and incrementally increases when the engine speeds up, then it is one of these two issues. All you need to answer in this case is whether your noise is a tap or a knock. On the other hand, if the clanging sounds more like an old diesel engine and increases in volume when the engine accelerates, then the problem is pre-ignition. If the problem is simply pre-ignition, then you will need to check your ignition system, including the knock sensor, crank sensor, and all your spark plugs and coils. This is the simplest thing to do first. Unplug each coil one at a time to verify that the engine loses power for each one. Valve tap can be caused by lifters or a broken valve spring. To diagnose this, you need to remove the valve cover and check the lifters. Are any loose when you try to move them up and down by hand? Engine knock signals that your engine needs to be rebuilt with new piston rods and bearings. It is not a good idea to drive very long with either condition or you could end up causing more damage and get stuck on the side of the road.
if it only does it when you start the engine or turn off the engine, its a big possibility that the exhaust is catching the tank or chassis. pop your head under the car and get someone to start it, you should see the problem. hope this helps and make sure car is in neutral before you start.
it seems related-module may be an aftermarket made in mexico--chec engine area for any abnormalities--may need tuneup and injector service--but fuel pump/delivery 1st--consider scanning car with a tech II cause this runs a data stream for precize analysis
Smoke on start? Could be a valve problem where all your oil is in the bottom at start? Belts are squeaking too? Maybe a tensioner went bad?
Saw this service bulletin---
TAPPING / KNOCKING NOISE FROM ENGINE AT COLD START This bulletin amends ITB02-049. This version amends the Applied Vehicles. Please discard all paper copies of the earlier version. APPLIED VEHICLE: 2002 - 2004 Q45 (F50) 2003 - 2004 M45 (Y34) 2003 - 2004 FX45 (S50) with V8 engine. IF YOU CONFIRM: A tapping or knocking noise (similar to a piston or valvetrain noise) when starting a cold engine, NOTE: The engine is considered “cold” when it has been OFF (not running) for several hours. ACTIONS: 1. Dislodge and remove any carbon deposits that may have caused the noise and confirm that carbon deposits were the cause of the noise. • While the noise is occurring, quickly rev the engine several times to approximately 4,000 RPM. Then release the accelerator quickly, as soon as the engine reaches 4,000 RPM. • The noise should disappear immediately if carbon deposits are the cause. NOTE: • If the customer reported a noise that exactly matches the symptoms listed above, but you cannot duplicate it, the cause may still be carbon deposits. Go to step 2. • If the noise does not stop after revving the engine, or you observe any other noise that doesn’t match one described above, go back to ASIST for further diagnostic and repair information. 2. To prevent this incident from occurring again, add a bottle of Nissan In-Tank Fuel System Cleaner P/N 999MP-FSC00P to a full tank of fuel (in the vehicle’s fuel tank) according to the instructions on the label. • This product is proven to reduce carbon deposits on pistons and combustion chambers, as well as cleaning other components of the fuel system.
First thing i would try...... ISOHEET, Red bottle..... allows water to be mixed into the fuel and be burnt out of the tank. get a good qaulity fuel injection cleaner, if you can locate the brand MALCO, i found it quite succesful..... and go with a full tank of premium fuel such as ammoco or shell......do not use yellow bottle of heet
It is possible that this may be your electronic fuel pump cycling on off to maintain fuel pressure. It may be an indication that the fuel pump is on its way out.... Have you done a trouble shoot with an auto manual specific for your Explorer yet? There should be a process of elimination guide or chart to help isolate the problem.