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Renault Safrane Misfiring cylinders when hot.

My 1999 reg 2.0 renault Safrane is working fine when cold first thing in the morning. It when the water temp get to normal temp it starts misfiring. I have no acelleration when this happens. I am loosing coolant but no visable signs of where it is going. The problem will correct itself from time to time randomly. Any help would be most appreciated. Thanks Steve

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  • Steve Penman Jul 18, 2008

    I have checked all that you said and cant find a leak. It doesn't always leak. i can run it without loosing any water for a couple of days and then loose a pint in a day. its weird. i do think that it is definitely linked in with the engine misfiring. cheers Steve

  • Steve Penman Jul 20, 2008

    i will keep checking for the leak as i do understand that its a closed system and i should be ale to locate the leak! thanks for you post. will get onto the misfire when i find the leak. cheers steve

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Hi Steve
I'm Dave
First lets start with the missing coolant.
Check your oil dipstick, both cold and hot. If the oil shows any signs of a milkshaky consistency your head gasket is blown. If it is only a slight leak that started recently it may not have reached the milkshake stage yet so look carefully for any signs of foreign substance in the crankcase(oil resorvoir). If all is good there then look for signs of a leak on the lower weep hole of the water pump. You may need a telescopic mirror or to get under the car with a flashlight to see the small hole in between the two lower splines. Next check for leakage out of the coolant resorvoir jug. They sometimes crack or develop a slight leak that is hard to notice because it will accumulate in a spot not neccesarily inspected for coolant leaks. This all assumes that you've checked the length of your upper and lower rad hoses, the bypass hose and the two smaller heater hoses that go to the heater matrix(core) in the dash or firewall. Check for a leak anywhere along the radiator both front and back, near the draincock or along the walls separarting the tranny fluid cooling area from the coolant cooling area. Next you can check for a leak around the thermostat and the rad cap. All of these checks should be done with the engine at operating temperature except initial hose inspection which should be done twice once when hot. If these all prove dead ends you should suspect a heater core problem. Is the area on the floor mats under about where the two heater hoses enter the passenger compartment wet or do the windows fog up needing a/c to defog? If so your heater core is leaking. And finally if none of this helps you can check the frost plugs for leaks. They are hard to find. They are circular cutouts found on the engine case. There may be quite a few.
Post me with your results and we'll move on to your secondary problem. Oh yeah also check for a leak where your coolant temperature sensor enters the engine usually somewhere near the thermostat. Looks like a large screw with wires coming from it.

Posted on Jul 16, 2008

  • dave barry Jul 20, 2008

    Hi Steve.

    Dave here



    Sorry for the delay in getting back to you as I have been out of town.



    As for the leak you will have to keep looking. Regardless of the misfire, the cooling system is a closed system and does not just burn away, especially at a rate of a pint at a time. The leak is there somewhere but obviously internittent. The things I've told you about in my previous post are the only places where the coolant can escape it will definitely be one of them. The leak will likely show as a green liquidy stain or as white flufffy deposits.

  • dave barry Jul 20, 2008

    hi steve

    dave here



    no need to wait just keep looking for the missing coolant. as you know it has not been stolen it is there somewhere



    for the miss when was the last time you changed your fuel filter?

    (Rhetorical question). If it has been a long time i would run my gas tank near dry (leave enough to get to the filling station) and then change it and refill the tank with fuel from a reputable station. This will kill two birds with one stone as a fuel filter is cheap and should replaced every 60 000 miles (100 000 km) or every two years if you dont drive that much and emptying your tank will negate the possibility of having some kind of water or metallic based impurity in your fuel.

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