Ed Hall Posted September 23, 2004 Report Share Posted September 23, 2004 Will an EGR valve from a 4.9 engine work on my 1988 eldorado with the 4.5 engine. I notice that the part numbers are different for the different years but isn't the block the same? What would be the difference? Link to comment Share on other sites More sharing options...
Scotty Posted September 23, 2004 Report Share Posted September 23, 2004 I for some reason doubt it. I know bbobynski will know exactly why, but I doubt it Early on sailors navigated by the stars at night and the North star became the symbol for finding ones way home. Once you know where the Northstar is you can point your ship in the right direction to get home. So the star became a symbol for finding ones way home or more symbolically even finding ones path in life. Link to comment Share on other sites More sharing options...
Ed Hall Posted September 24, 2004 Author Report Share Posted September 24, 2004 I'm guessing that there isn't hardly any difference. Probably the only difference is the spring rate in the EGR valve itself to compensate for the larger displacement engine. Link to comment Share on other sites More sharing options...
Scotty Posted September 24, 2004 Report Share Posted September 24, 2004 I guess there is no harm in trying it! The only problem is if they operate totally different. Bbobynski has discussed how certain EGR valves operate differently. I will do a search and see if I can find his info. Early on sailors navigated by the stars at night and the North star became the symbol for finding ones way home. Once you know where the Northstar is you can point your ship in the right direction to get home. So the star became a symbol for finding ones way home or more symbolically even finding ones path in life. Link to comment Share on other sites More sharing options...
Scotty Posted September 24, 2004 Report Share Posted September 24, 2004 Here is one of bbobynski's jewels on EGR valves! The question is whether or not both or your EGRs are POSITIVE or NEGATIVE EGR types.... A check of the part numbers may give you a clue. Good Luck, Mike The EGR valve is actually fairly complex inside. There are a series of ofifices that meter the vacumm to the diaphragm based on the exhaust back pressure signal that is picked up from the end of the EGR pintle at the end of the shaft. The valve is NOT just a simple can and diaphragm. If the valve is a "positive" type EGR valve you can apply vacuum and it will not open until it sees exhaust back pressure. A "negative" style valve will open (the diaphragm will move) as soon as vacuum is applied and then back off the opening when it sees backpressure. I don't remember what type is on a 93 but just appli=ying vaccum is not necessarily a definitive test for an EGR valve Early on sailors navigated by the stars at night and the North star became the symbol for finding ones way home. Once you know where the Northstar is you can point your ship in the right direction to get home. So the star became a symbol for finding ones way home or more symbolically even finding ones path in life. Link to comment Share on other sites More sharing options...
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