Question about 1997 Chevrolet Lumina

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Knocking noise coming from fuel tank area

There is a knocking noise coming from the fuel tank area. It's non rhythmic and it happens when the engine is turned off.

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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
thanks
~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
~Dave

Posted on Feb 16, 2014

  • Dave Feb 16, 2014

    dave fink will not be the fuel pump for a fact this will never give you a thump

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2 Answers

What happens when you drive without a gas cap


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.

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1 Answer

Knock while driving off on cold engine


There are many possibilities that can cause car to make noise.

It's actually from where the noise is coming from. Front end or rear end. From engine area or from inside the steering or from brakes.


There is N-number of possibilities for the car to make knocking noise or any other kind of noise.


---------

For step by step troubleshooting this problem, I suggest you to refer the help links mentioned below. Its a complete solution with proper explanation to identify the cause of problem: ------


Click the link below: -----




CAR NOISE ISSUES
http://alltypesofpartsreplacing.blogspot.com/2012/11/car-noisesnoisy-cargrinding.html


=------------

These will help.

Thanks.

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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.

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I have a knocking noise coming from the fuel tank area when I start and stop the engine on my 2001 Hyundai Accent Does anyone have any ideas to what the sound may be


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.

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Vibrating noise by fuel tank in 1999 silverado


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2007 Chevy Cobalt, automatic, runs awful ONLY in heavy rain, NO code When driving in heavy rain or if driving through standing water on roadways, my Cobalt will start making a roaring noise (almost like...


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Infiniti G35 - 2006 Sedan - 37,000 miles. Knocking noise in engine area: Happens only in gear (drive or revese); loudest after engine is warm; took vehicle to dealer twice. First time, changed engine oil...


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.

Hope helps.

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Hope that helps...=)
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