Question about 1999 Oldsmobile Bravada

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Gas cap Can you drive the truck without no gas cap

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Yes- but you will have one very big
evap system leak,it won't run correctly
when purge valve opens & you will get
a Mil lamp & codes for the system.
Why do you ask?

Posted on Jul 23, 2013


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2002 Montero Sport LS 3.0 engine

Go to an auto parts store and have them read the code(s) to tell you what the problem is. If there are no other problems, it is safe to drive there.

Likely a problem related to the pollution control equipment - catalytic converter, PCV valve, etc. Hard to tell without the codes.

Is your gas cap on tight? Often that is the problem. It may take a couple of drives and/or days to clear the Check Engine light after you have tightened the gas cap.

Good luck !!

If this has been helpful, please rate accordingly. Thanks.

Jul 04, 2016 | 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

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Gas cap not tightening

Can't dismiss or second guess what you were told

Auto Parts Store counter people are not mechanics
or techs

Check for codes,then diagnose

Test,test,don't ask questions

Nov 20, 2012 | 2005 Toyota Corolla

1 Answer

My 2001 Sonata stalls and often fails to start, especially after I fill it up with gas. It sounds like a full pump issue? Suggestions?

Take the gas cap off and leave it off for a day or so. If you do not have enough sense to drive a vehicle without a gas cap, then drive as though you have a full cup of hot coffee with no lid on it sitting between your legs. If the problem does not recur sans gas cap, go and buy a new gas cap from a dealer, not off the shelf of a parts store. If the problem comes back with the new gas cap, the dealer is going to have to figure out which part of the gas tank pressurization system is bad.

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2005 uplander engine light comes on then we play with the gas tank lid it goes off then comes back on after abit

I had the same problem AND I couldn't start the engine after getting gas without playing with the gas cap, so I replaced the gas cap with an aftermarket cap and have not had problems since.

Jan 17, 2010 | 2005 Chevrolet Uplander

1 Answer

The Caravan refuses to drink. Pressure back up triggers shutoff.

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How to turn off "gas cap message"

the gas cap message should reset by itself after several operating cycles without a loose cap. That's how the gas cap light works.
But, check your owner manual for a reset procedure.

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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

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I just had the same problem and the dealer told me that it was an erratic gas gauge. They needed to fix it.

Jul 30, 2008 | 2004 GMC Envoy

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