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Mercedes GL450 2007 58000mi Hard to start. When it's hot or all the way cold it starts fine. But when I try to start after an hour or so it just turns over. It will turn over for as long as I want

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Clogged fuel filter or bad ignition module or coil try some dry gas in it or 99% isopropl alcohol in the fuel if it a gas engine

Posted on Jan 18, 2013

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alicantecoli
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SOURCE: changed timing belt seems to run fine then when it sets overnight when the engine is cold I'll start in the morning and the the check engine light coms on and stumbles for a few seconds then runs

not sure here without my head under the bonnet and a hammer in my hand to threaten it with but i would look for a wire loose or a connecton to a temperature sensor so the auto choke isnt coming on first ,look for this then reply via this answer as if the cams were out by more than 2 teeth the valves would hit the pistons .Then i will think again for you

Posted on Aug 18, 2012

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98 silverado 5.7 hard starting when warmed up starts fine cold what could cause this?


check for a bad fuel pump relay. One of the first signs of a failing DME/Fuel Pump is difficult hot starting. Quite often when the DME/Fuel Pump relay starts failing the car will start without problems when it is cold. However, when the car has been operated at normal operating temperature for a while, it will refuse to start. Its worth a try! (usually 30 minutes to 1 hour), the car will again start without problem. Is this the case! Good-Day!

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Could you give more detail as to what it's doing exactly? Is it having a hard time cranking the engine or does the engine crank but not want to get started?

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the light means to do exactly what it says

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When she cold she'll go when she hot she won't start,take a hour for her to cold down before starting


I had a car that did that to me, turned out to be the battery. It was getting old and needed replacing. You could clean the contacts for the battery as well, might help a little. My car ran for a hour or more but if I stopped and tried starting shortly after I was toast. Had to wait 45 min. or more to start. Hope this helps.

Mar 10, 2013 | Cars & Trucks

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The car will turn over and some times it wil start and some times it just turns overI and will not start.It has been to the dealer and they did not find what was wrong. The seat seems to work after he set...


If the car starts and runs fine when you first start it in the morning or when its cold from sitting for a few hours after driving it but won't start if you drive it somewhere and get the car upto operating temp and then shut the car off and try to restart it with a few mins or upto a half hour basically when the car is hot then you might be looking at a bad crankshaft position sensor. A bad crankshaft position sensor can keep the car from starting mostly when its hot. If the engine control module doesn't see that signal it doesn't know the engine is running so it never sends fuel to the injectors.

Oct 04, 2010 | 2001 Mercedes-Benz C-Class

1 Answer

1983 300td hard to start when cold.


The glow plugs can be worn also.Make sure the glow indicater is nice and red.

Aug 30, 2009 | 1983 Mercedes-Benz 300-Class

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1987 mercedes 300CE does not start very well after thse engine is shut of for .5 of an hour or more-however st arts fine when it is cold.


well if tune up and normal maintenance is current I would guess its the cold start valve. When the valve starts to fail or fails it can allow the extra fuel used at cold idle to "flood" the system when its not needed when warm.

Aug 23, 2009 | 1987 Mercedes-Benz 300-Class

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Sits overnight or a few hours , wwillnot start without pumping gas pedel many times. runs fine after started.


your cold start went out it is a small injector in the middle of the manifold by the head its there just to help it start cold they go out all the time it just shoots more gas in when it starts

Aug 17, 2009 | 1987 Mercedes-Benz Mercedes Benz 190 Class

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