sanyantho Posted December 23, 2015 Report Share Posted December 23, 2015 Hi Ratsuns! I was installing a new weber carb today and notice that I had a good size hole in the ERG passage. It was underneath so it was hard to see. What can be the cause and the affect from having this hole? Vacuum leak? Thanks in advance Quote Link to comment
Doctor510 Posted December 23, 2015 Report Share Posted December 23, 2015 PLUG IT! It would help if you told us what car/truck you are working on. Quote Link to comment
datzenmike Posted December 23, 2015 Report Share Posted December 23, 2015 Above idle and below full throttle the EGR is active and mixes small amounts of exhaust in with the intake air and fuel. The exhaust is inert and oxygen free and simply takes up space in the combustion chamber. This lowers the power slightly, but more important it lowers the oxides of nitrogen emission causing combustion temperatures. This only works if exhaust without oxygen is used. If you have a hole in the tube outside air with oxygen will get in and upset the intake air / fuel ratio designed into the carburetor. Effectively you will run a lean mixture during EGR operation. If this is on the 620 try wrapping with that one sided sticky aluminum muffler tape to seal it up. 1 Quote Link to comment
sanyantho Posted December 23, 2015 Author Report Share Posted December 23, 2015 Sorry guys, I am working on a 74 620. Thanks again Mike, I will pull it out today and see if I can wrap it with the muffler tape. I have been doing research on here and came across some info on making an EGR block plate. Seems that everybody has a PVC holes going to the EGR passage area, but I don not remember seeing one on my truck. I know you mention on other threads how important it is to have one. Quote Link to comment
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