Exhaust Gas Recirculation valve

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: It is an emmission-control device and it works best if you remove it from the engine and never put it back on there. It was originally designed to reduce Oxides of Nitrogen. But they get clogged and rob power. Here in Colorado, they have pretty strict emission standards but they don't check for EGR on ''74 & older vehicals. I removed mine years ago and haven't looked back. You will probably want to replace it with a 1-inch carburetor spacer since the stock intake manifold is not a high-rise... : : : After reading this it dawned on me that when I cleaned it(all original) I may have dissolved some residual matter that may have been sealing a leak. I'll check this area. : : Now I reveal my ignorance. What is an EGR valve, how do I check it, or is it something that should just be replaced? : : : Hey "Sparks"...as I've just finished reviewing old stuff (to find out what year your Mav is) another possibility came to mind. If yours is a '73, it "should" (IF it's still stock) have an aluminum 'spacer' under the carb (for the EGR valve). This spacer can/will/does corrode to the point of 'leaking' raw air into the manifold, obviously the gaskets associated with it could be leaking too . Another related suggestion is your EGR valve itself, could be sticking/stuck causing the lousy idle/running. Just some more ideas... : : : : : : : Last weekend I pulled a plug to take a look. They were all black, but looked good. The shop that installed them must have used the "out of the box" gapping method. they were all .025". : : : : So, I cleaned them up and reset the gap (except for the one on the passenger's side I couldn't reach- 3rd back from the front, passenger side) : : : : Lo and behold she ran fantastic. : : : : This weekend I go after the last plug, and had to put in a new one. (it was very old, and insulator broke upon removal). : : : : I used a can of carb cleaner on the carb (factory 2bbl)It was so black it didn't even look metal, replaced some cracked vacuum hoses, replaced the breather, air and fuel filters. : : : : It resisted starting, and had some backfiring. So I replaced the wires. I did'nt have the buckos for the good ones right now, so I bought : : : : what the shop had. This made a litte difference, but not much. : : : : The most noticable problem is upon acceleration between 25 and 45MPH. It surges and backfires. : : : : I cannot swing the price of a carb right now, or even the price of shop help. : : : : This Mav is used daily - I got it to keep me out of the elements. (normally ride a Mcycle) : : : : I should be getting a Chilton Manual this week- I was high bidder at ebay. : : : : In the meantime, I could use a litte advice. : : : : one more thing, on the side of the carb is a round black device my mechanic referred to as a preheater : : : : when I had the water pump replaced. It is set as rich as it will go. I tried moving it from as lean as it will go and back, and different points in between, : : : : with no difference in performance.

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