Scout Hokie
Member
Ok some background. Its a '74 Scout II with 345 and 727. Since day 1 when I got this truck a few months ago, its never idled well but it did idle with the stock carb. Decided to swap to the 0-7448 and now it won't idle at all. Starts quick, sounds great under throttle but take your foot off the gas and the rpms drop and it immediately cuts out. We've played with the timing and idle mixture screws but it doesn't solve the issue. We can adjust the idle mixture screws to pump enough gas to idle but its terribly Rich and still idles rough and high (~1500 rpm). It appears to be a vacuum leak, in my estimation. Even when we had it idling very roughly at 1500 rpm, you could cover the intake of the carb with your hand and the motor would rev to 3000 rpm, indicating that it must be getting air from another source. The fun part is that I can't find it. We isolated everything up top by capping all of the vacuum ports. This truck does still have an egr, that was capped. I did purchase and install the thicker carb gasket as well. I decided that it must be from underneath the intake manifold, maybe one of the welch plugs. Took the manifold off this evening and all of the plugs look pretty spectacular. Also, when I installed this manifold the last time I sprayed the gaskets with copper gasket maker and assumed that it made a good seal.
I'm at the end of my rope, can't seem to spot the 'smoking gun' here. I've included a few pictures hoping they May help. Not sure if the gasket markings will tell any one anything but I'll include them. The only thing that I question is that the po definitely did not use a gasket for the egr. It appears that he just used some of the grey liquid gasket maker to 'create' a gasket. I was planning on doing the egr delete at this point anyway but can you guys think of anything else to check?? My plan right now is to install egr delete and buy new intake manifold gaskets and button 'er back up and hope for the best.
Thanks for any and all words of wisdom!
I'm at the end of my rope, can't seem to spot the 'smoking gun' here. I've included a few pictures hoping they May help. Not sure if the gasket markings will tell any one anything but I'll include them. The only thing that I question is that the po definitely did not use a gasket for the egr. It appears that he just used some of the grey liquid gasket maker to 'create' a gasket. I was planning on doing the egr delete at this point anyway but can you guys think of anything else to check?? My plan right now is to install egr delete and buy new intake manifold gaskets and button 'er back up and hope for the best.
Thanks for any and all words of wisdom!
