Re: AAAAARGH! Another suggestion to check.


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Posted by Sparks on January 20, 1999 at 09:13:35:

In Reply to: Re: AAAAARGH! Another suggestion to check. posted by Ron S. on January 19, 1999 at 21:27:19:

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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