87subbomber Posted January 15, 2017 Share Posted January 15, 2017 so i did my weber conversion and i cannot get it to idle. it attempts to start, but has a burst of fuel shoot out the top of the carb. the idle jets are 50/55, 140/140 main and secondaries. i did get it started but i have to keep it above 3000rpm to keep it running. it runs great at that rpm, sounds like a sportscar! the choke works fine. i was told with fuel spraying out the top its running lean and i may need to change the mixture jet. any help is appreciated. Link to comment Share on other sites More sharing options...
naru Posted January 15, 2017 Share Posted January 15, 2017 Check your timing. Link to comment Share on other sites More sharing options...
87subbomber Posted January 15, 2017 Author Share Posted January 15, 2017 I didnt think of checking the ignition timing. will i get an accurate reading if the engine is just turning over and not idling? i can get it running to about 3k as i mentioned, but at those rpms wouldnt the vacuumm advance be kicked in and not be accurate anyways? excuse the noob questions, only other carbed vehicle is my 1982 chevy truck, im new to carbs really Link to comment Share on other sites More sharing options...
naru Posted January 15, 2017 Share Posted January 15, 2017 Yes you can check ignition timing w/the engine cranking over and not running. If it is an ignition timing problem,I expect it would be far enough out to be detectable w/the engine stopped and #1 at TDC. Distributor rotor should point at either #1 or #2 contact depending on whether #1 cyl.is at TDC of the compression or exhaust stroke. Could be an intake valve hanging open for some reason too. I would check compression and cam timing if the ignition check brings no joy. Link to comment Share on other sites More sharing options...
87subbomber Posted January 17, 2017 Author Share Posted January 17, 2017 ignition timing is at 10°. ran great until weber swap, going to try and adjust the idle mixture screw and also ignition timing since ill have an extra set of hands. Link to comment Share on other sites More sharing options...
87subbomber Posted January 24, 2017 Author Share Posted January 24, 2017 so, i finally got the car to idle and drive smoothly! i had a bad vaccuum leak, fixed that. retarded timing to 14° btdc, and of course looked at plugs and wires. in looking at plugs and wires, noticed firing order is wrong!i had cylinder 2 and 4 plug wires backwards! i think i lost three wrenches knocked over some boxes and sent the neighbors cat back over the fence! (not serious, lol). switched wires and poof, it runs. thanks Ultimate Subaru for this board. without reading a post about a wrong firing order from 5 years ago, i wouldnt have figured it out Link to comment Share on other sites More sharing options...
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