yes ! do not use any cleaner on DIAPHRAM.. just on down part of egr !Kindfiend said:If you followed the correct procedure for timing, then I would say check the condition of the various hoses. Sometimes the ends get dry rotted and cracked. As for the EGR, don't use any cleaners in it as it will damage the diaphram. Generally, the tube leading from the exhaust to the EGR gets clogged with some really tough stuff. It's ok to take apart the EGR but there is a gasket that you should replace. You just want to make sure the diaphram moves freely. Good luck!