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Silicon Dielectric Grease - Smoother running, more responsive & less smokey TDI!!
- Thread starter EdButler
- Start date
You obviously didn't read what I posted, did you.
Here it is again. I've bolded the bit you missed.
I have tryed it on my 2.0TDI PD, but for me there is no noticeable difference
It doesn't make things any better. It prevents oxidisation and as such prevents loss of performance as the car gets older. If your car is in top condition then it'll keep it that way, but won't make it any better. If it's losing performance due to corrosion and poor contacts then the stuff will help.
![[B)]](/forums/styles/seatcupra/oldforumsmileys/shades.gif "Cool [B)]")
I have tryed it on my 2.0TDI PD, but for me there is no noticeable difference
Same here tbh
And over a few months the car go back to the dealer and a new CR 170bhp facelifted seat leon, yellow is on the verge on being ordered, together with 18" black allow wheels, yellow painted brakes, yellow side skirts, EPS exhaust (without PDF), perforated brake disks, 3mm's lowered, sun roof, chiptuning and the black 46 sticker on the back of the car
Not really a cure tbh, more a prevention to prevent corrosion, weak signals, signal noise from vibrations etc.
I used contact cleaner first and then silicon grease on all the electrical connections on my engine. My idle is now smoother and throttle response is improved too.
jonespxx
Guest
Chaps
Dont know what the hell you are putting on the connections (not read the whole thread) but it under no circumstances should be silicon grease of any sort. There are a number of items out there that are designed to stop arcing and corrosion and even repair micro pits on the surface, the pricey ones can even shift silicon residue from the connections via some trick chemistry. These have been formulated to give low resistance at the point of contact and high resistance in other areas, they do stop arcing and are superb for all the signal and 5v connections on the engine, reducing micro arcing, corrosion and high resistance joints.
One thing I am sure as hell about is that none of them contain silicone compounds, if you put anything on the engine interconnects with a silicone compound in it will in time deteriorate the connection performance significantly.
Have a look at ;
://docs-europe.electrocomponents.com/webdocs/001a/0900766b8001a9f2.pdf
(you need to put http in front of it)
This explains why your contact performance drops off over time and has a section on silicon contamination.
This stuff is good but you really shouldnt need it, a swab with WD usually cures most connector issues but for low current plugs contact grease can give impressive results to mystry running problems.
I will say again though, never use a silicon based compound on any vehicle electrical connection.
Dont know what the hell you are putting on the connections (not read the whole thread) but it under no circumstances should be silicon grease of any sort. There are a number of items out there that are designed to stop arcing and corrosion and even repair micro pits on the surface, the pricey ones can even shift silicon residue from the connections via some trick chemistry. These have been formulated to give low resistance at the point of contact and high resistance in other areas, they do stop arcing and are superb for all the signal and 5v connections on the engine, reducing micro arcing, corrosion and high resistance joints.
One thing I am sure as hell about is that none of them contain silicone compounds, if you put anything on the engine interconnects with a silicone compound in it will in time deteriorate the connection performance significantly.
Have a look at ;
://docs-europe.electrocomponents.com/webdocs/001a/0900766b8001a9f2.pdf
(you need to put http in front of it)
This explains why your contact performance drops off over time and has a section on silicon contamination.
This stuff is good but you really shouldnt need it, a swab with WD usually cures most connector issues but for low current plugs contact grease can give impressive results to mystry running problems.
I will say again though, never use a silicon based compound on any vehicle electrical connection.
Having (quickly) scanned your offered document, I'm not sure you're talking about the same issue as we are here. Your document appears to concentrate specifically on contactors and their related function. The use we're discussing here is not intermittent contacting areas but permanent points of contact. Connections, basically. In the same way that dielectric grease is applied to battery terminals to prevent corrosion, it can also be applied to the connector for the Mass Air Flow sensor (or MAF) to prevent corrosion on the terminals. There are some people who seem to think that applying said grease will cure all problems, when in fact what they should be doing is using a deoxidising agent to clean the terminals and then using dielectric grease to prevent moisture / dirt ingress which will lead to corrosion again.
jonespxx
Guest
Viking
The document shows what happens between sliding contacts as these products were designed to minimise wear on this type of component. The physics is exactly the same in a static automtive connector particularly on an engine, every failure described does happen on all automotive connectors over a period of time. The vibration causes fretting leading to corrosion, high resistance and intermittent electrical faults.
I totally agree that removing the connector, gentle solvent cleaning and addition of a dilectric grease will improve the connection and solve many of the gremlins, this is without question a very good preventative maintenace to undertake.
The issue I have is that in a number of posts the substance used is described as silicon grease. Silicon grease will cause untold issues if applied to some of the engine sensor interconnects as it has a very high resistance, even if it is only a few molecules thick. I think it is a missnaming issue but if somebody out there does put silicon grease on their engine interconnects they could have endless random DTCs.
There are products called Silicone Dielectric Grease and are described as "Super Lube® Silicone Dielectric Grease is translucent white, clean and clear in appearance and exhibits high dielectric strength and is compatible with most plastics." which are good for things like putting on torqued up earth stud connections or battery connection etc to stop moisture penetreation. The point is that they have a high dielectric strength, this is not good for low current applications such as MAF MAP etc.
Be careful, know what you are putting on before you apply it.
The document shows what happens between sliding contacts as these products were designed to minimise wear on this type of component. The physics is exactly the same in a static automtive connector particularly on an engine, every failure described does happen on all automotive connectors over a period of time. The vibration causes fretting leading to corrosion, high resistance and intermittent electrical faults.
I totally agree that removing the connector, gentle solvent cleaning and addition of a dilectric grease will improve the connection and solve many of the gremlins, this is without question a very good preventative maintenace to undertake.
The issue I have is that in a number of posts the substance used is described as silicon grease. Silicon grease will cause untold issues if applied to some of the engine sensor interconnects as it has a very high resistance, even if it is only a few molecules thick. I think it is a missnaming issue but if somebody out there does put silicon grease on their engine interconnects they could have endless random DTCs.
There are products called Silicone Dielectric Grease and are described as "Super Lube® Silicone Dielectric Grease is translucent white, clean and clear in appearance and exhibits high dielectric strength and is compatible with most plastics." which are good for things like putting on torqued up earth stud connections or battery connection etc to stop moisture penetreation. The point is that they have a high dielectric strength, this is not good for low current applications such as MAF MAP etc.
Be careful, know what you are putting on before you apply it.
Shrek1802
Guest
I have found this place thats post to anywhere in the world and u can pay by paypal the postage is very cheap aswell.
Dow Corning DC4 Dielectric Grease 100g
ww.chilledpc.co.uk/shop/product_info.php?products_id=227
They say on another few forums this Dow Corning DC-4 is the best stuff and used on airoplanes to stop moisture on them.
The total with postage cost me £9.61. Will do both cars when i get it and got a mate who uses the stuff on his bike and say he now dont get errors and stuff after he washs the bike like he did before.
Dow Corning DC4 Dielectric Grease 100g
ww.chilledpc.co.uk/shop/product_info.php?products_id=227
They say on another few forums this Dow Corning DC-4 is the best stuff and used on airoplanes to stop moisture on them.
The total with postage cost me £9.61. Will do both cars when i get it and got a mate who uses the stuff on his bike and say he now dont get errors and stuff after he washs the bike like he did before.
Last edited by a moderator:
See item 4, its this connector for the MAF. and 12 for the MAP, this is a pic of a older gen TDI in a leon but locations will be similar for all models, ie MAF in line with the airbox and MAP on the pipes to the intercooler.
faaaaaaaaantastic!!! cheers guys~! got my dialectric grease yesterday- a dear wee bugger for all the size of it, couldnt get it in any of electronic shops or maplins etc ended up getting some of ebay, 4quid, for size of tube youd get coldsore cream in! ah well......... hopefully it'll work some magic!
Altea_Pike
Guest
I like the sound of this but what the hell is an MAF?? Im going to be asking you guys alot of these questions trust me lol
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