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Thread: Thermostate + egr = common link ?

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    Default Thermostate + egr = common link ?

    Just thinking out loud, I wonder if the majority of egr issues are related to the thermostat`s failing.

    The logic , Cooler engine temp means over cooling the exhaust gases causing the soot build up in the egr valves ?

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    Regular Member lee1828's Avatar
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    I think you could be right but i think that the thermostat threads have got plenty of people starting to panic. The way i see it is if the thermostats fail in the open position then the heaters would take forever to get warrm, never mind hot and the engine would also take ages to warm up. If the heaters are hot after a short while then the thermostat must be working as it should..Just thinking out loud like yourself..

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    Quote Originally Posted by roswell View Post
    Just thinking out loud, I wonder if the majority of egr issues are related to the thermostat`s failing.

    The logic , Cooler engine temp means over cooling the exhaust gases causing the soot build up in the egr valves ?
    I can see the logical link as lots,if not most of CDTI's have the "Thermostat" problem,however,if you blank them at the exhaust inlet point and stop the flow,doesn't the MAF sensor cause the MAP sensor to over fuel?.If this IS the case,then you will end up spending more now,with the price of fuel rocketing,than it will cost to eventually replace the valve!!. FELIXX.

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    Regular Member lee1828's Avatar
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    Quote Originally Posted by felixx View Post
    I can see the logical link as lots,if not most of CDTI's have the "Thermostat" problem,however,if you blank them at the exhaust inlet point and stop the flow,doesn't the MAF sensor cause the MAP sensor to over fuel?.If this IS the case,then you will end up spending more now,with the price of fuel rocketing,than it will cost to eventually replace the valve!!. FELIXX.
    I wouldnt know the answer to that to be honest but if anyone has a thermostat issue they will know. If the stat is stuck on open your car would take forever to warm up and on a long journey your heaters would be luke warm, simples

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    Regular Member felixx's Avatar
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    Quote Originally Posted by lee1828 View Post
    I wouldnt know the answer to that to be honest but if anyone has a thermostat issue they will know. If the stat is stuck on open your car would take forever to warm up and on a long journey your heaters would be luke warm, simples
    The reason for my previous post was that my thermostat doesn't move much if any,and I did blank the EGR off and it seems to be using more fuel.......at the moment. FELIXX.

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    Regular Member lee1828's Avatar
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    Quote Originally Posted by felixx View Post
    The reason for my previous post was that my thermostat doesn't move much if any,and I did blank the EGR off and it seems to be using more fuel.......at the moment. FELIXX.
    How do you mean your thermostat doesnt move much? I dont think blanking your EGR valve off would cause it to use more fuel..

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    Regular Member felixx's Avatar
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    Quote Originally Posted by lee1828 View Post
    How do you mean your thermostat doesnt move much? I dont think blanking your EGR valve off would cause it to use more fuel..
    I meant the temp gauge,sorry.And I agree that it shouldn't cause the engine to use more fuel,but,on the face of it,it seems that it really is!!. FELIXX.

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    Quote Originally Posted by felixx View Post
    I meant the temp gauge,sorry.And I agree that it shouldn't cause the engine to use more fuel,but,on the face of it,it seems that it really is!!. FELIXX.
    I keep a check on mpg, when my thermostate stuck open my car (1.8) used a lot more fuel. I usualy get 37/43, but it droped to 32 mpg.

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    Quote Originally Posted by CLOMP View Post
    I keep a check on mpg, when my thermostate stuck open my car (1.8) used a lot more fuel. I usualy get 37/43, but it droped to 32 mpg.
    I think with the petrol engine,the fuel consumption is always high if the engine doesn't reach it's operating temp,it will,(I think),be running rich because it will be on choke.With the diesel it's being said that running cold =more soot hence the clogging up of the RGR and probably the inlet manifold.
    I have another problem with fuel at the moment,(diesel deposits around the swirl pots),and I can't find where it's coming from.This could be EGR related or something completely different.Havn't a clue at the moment,so I will have to see what anyone on here thinks. FELIXX.

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