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Does it hurt a car to run without gas cap - Cars & Trucks

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Not really, might set off an emissions code and you risk getting foreign objects in your tank.

Posted on Oct 19, 2013

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Posted on Jan 02, 2017

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SOURCE: Check engine light/gas cap will not stay tight.

yes the gas cap could cause this,also check evap. purge solenoid and hoses for cracks or kinks,the solenoid is on the inner fender and has 2 hoses, one to the intake and one to the canister, the most common cause of this code is a defective purge solenoid.

Posted on Apr 24, 2009

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SOURCE: will the lost of a gas cap hurt the cars take off

MAYBE. The loss of gas cap can cause water and dirt to enter the fuel tank, and fuel filter, and lead to a loss in power. get a new cap and the fuel filter repalced. the loss of power may be another problem, but you will need these items replaced first.

Posted on Oct 09, 2009

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SOURCE: engine light stays on my Toyota Highlander 2003 4 cylinder

if it's just an emissions code, it won't give you problems until it is time for inspection. you should find out that it isn't something new.

Posted on Mar 08, 2013

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Engine light on in instrument panel


PepBoys, Autozone, Advance(or other chain parts house) all should offer free diagnostic testing, as well as the part(s) and rental (or for purchase, if you choose) tools to fix it, and might even help or change it for you. Might try plain gas with no ethanol and checking gas cap, as well. Friend had the same problem and did 100% plain fuel and tightened the cap, which corrected it for him (won't always work, wouldn't hurt to try though). Good luck.

Dec 29, 2015 | 2010 Ford Ranger 3.0

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.will not having a gas cap hurt my car


As it part of the canister system then the engine will not run right. Besides it being illegal to drive a car with out a fuel cap, then it is costly as the fuel will spill out on corners . Really -how much does a fuel cap from the wreckers cost compared to a fire ball if someone hits your car.

Aug 21, 2014 | Cars & Trucks

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.

Jun 02, 2014 | 2004 Dodge Neon

1 Answer

If the distributor cap is bad would it make the vehicle sound like its out of gas


Yes. There is an old not-so-funny gag people used to do. They'd draw a line on the inside of a distributor cap with a #2 pencil, and replace the cap. The Car will run very badly no matter what else you do. My point is, a bad/dirty distributor cap will be a headache, so just replace the cap. It wouldn't hurt to get some new plugs and wires as well.

Mar 30, 2014 | Cars & Trucks

1 Answer

Trouble with car not staying started with gas cap on?


if gas tank does not vent it causes a vapor lock in the fuel system. my want to check if vent hose is not pluged up.

Jul 17, 2012 | Chevrolet Cars & Trucks

1 Answer

I am getting a po442 code on my scan tool. A small evap. leak detected. I have replaced the gas cap a couple of years ago. I put the lite out and it stays off for about a year then comes back on. Anybody...


This is what they call a 2 trip code. It takes two running times to set. Small leak is 98 % of the time gas cap not on tight enough. Three clicks minimum. Just reset the computer and see if it comes up again. For your year EVAP is not a big deal. Doesn't hurt fuel economy or performance.

Jul 02, 2011 | 2003 Chevrolet Malibu

1 Answer

Initially starts fine, runs fine, then stalls at the first stop.


This is a fuel pump issue. i would replace it and the lines as well.also, a minor tune up wouldn't hurt as well. wires plugs distributor cap points etc...

Feb 11, 2009 | 1992 Dodge Dakota

2 Answers

2002 MB C320 gas cap problem


I had the exact same problem, went to the Mercedes dealer and they fixed it for free with a pair of pliers. They just pulled up the metal clips and turned them back into place.

Jan 04, 2009 | 1997 Mercedes-Benz C-Class

1 Answer

Emmission light on in Ford Windstar


MINE HAS THE SAME THING,IT IS NOT GOING TO HURT ANYTHING,MAKE SURE GAS CAP IS TIGHT,U CAN UNHOOK THE BATTERY FOR LIKE 2 MINUTES HOOK BACK UP AND THE LIGHT WILL GO OFF,RESET ITSELF,OR U MIGHT HAVE A VACCUM LEAK SOMEWHERE IN THE HOSE

Dec 05, 2008 | 2001 Ford Windstar

2 Answers

Engine Light


What is the code? Could simply be a loose gas cap setting the light off. If the light goes off after several engine run cycles, it's not a consistent problem. Blends may affect performance but shouldn't hurt the vehicle if you are using the correct octane. Your owner's manual defines the required octane.
Some parts stores scan your vehicle for free in hopes you'll buy parts to correct whatever the code is. Be careful as codes mean more than 1 thing usually. Get the code from the store and post from there.

Jun 05, 2008 | 2002 Jeep Grand Cherokee

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