Question about Cadillac DeVille

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After driving for about an hour...then if you go up a hill or steep grade it acts like it is going to die. As long as you are on level ground it is fine..only happens driving up hill. The car will go from do 60mph to barely doing 20mph and leap frogging.

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You may have a bad catalytic converter, because when the exhaust system get hot it melts and constrict the exhaust flow . bring your car to a muffler shop and have them check the exhaust system pressure. they normally do this for free.

Posted on Aug 22, 2010


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An automatic will not roll back on a gentle hill, but could do so on a steep hill. God-Bless! The torque convertor can only hold back if the grade is not to steep.

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Going up hill lack of power and smoke pulled over then started to go again didnt do it again on level ground what it might be

It will lack lots of power going up hill, especially if its a really steep one and you keep it in drive. Make sure you downshift to second, or fist if its really steep.

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1 Answer

Clacking noise when going up steep hills

What you may be hearing is called "octane ping". It occurs when the engine is under heavy load and the fuel does not have enough octane to efficiently run the engine. Older engines like yours were often run on premium gasoline to avoid this. However, if you do not have the clacking when accelerating on level ground and only have it on the steeper hills, it is not necessary to spend more money for mid-grade of premium fuel. Only if the engine makes the noise under normal operation is this advised. A little octane ping in those situations will not hurt the engine. But, if you need the peace of mind, and to ensure that the clacking IS octane related, I would try one tank of premium and retest the engine of a hill you know causes the problem to see if it goes away.

Nov 11, 2013 | Cars & Trucks

1 Answer

When fuel is below 1/4 tank going down hill car acts like its not getting fuel it sputters until elevation levels or begins up hill incline

1/4 tank on the flat. You fuel system is sucking air on a grade bcause it is all going t the front of the tank. !/2 tank is about as low as you should go.

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Want go in reverse

two things that i would check first, make sure parking brake is off, then check trans fluid level (engine running, in park, on level ground) also do you park the vehical on level ground at night? my car acted like that the other day, my driveway is at a steep angle, parking it nose up hill, when backing out, it coasted back no problem but when i hit the gas to back up a little more, i got nothing. waited a few seconds then it grabbed. then i backed up with no problem.

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It may be a leaky injector. The injector is connected to the bank. 1 of 2 fuel rails.

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Sounds like it could be some water in your Carb, i would recommend cleaning it out, Also it could a blocked air filter

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